CN114482945B

CN114482945B - System and method for realizing recovery simulation experiment of edge and bottom water reservoir

Info

Publication number: CN114482945B
Application number: CN202011173666.9A
Authority: CN
Inventors: 马涛; 伦增珉; 吕成远; 王友启
Original assignee: China Petroleum and Chemical Corp; Sinopec Exploration and Production Research Institute
Current assignee: China Petroleum and Chemical Corp; Sinopec Exploration and Production Research Institute
Priority date: 2020-10-28
Filing date: 2020-10-28
Publication date: 2024-08-20
Anticipated expiration: 2040-10-28
Also published as: CN114482945A

Abstract

The present invention discloses a system for realizing an edge bottom water oil reservoir recovery simulation experiment, comprising: an injection device, which is configured to pass an injection medium into a model device; an edge bottom water simulation device, which is configured to inject an edge bottom water simulation fluid that meets the experimental requirements into the model device, and to keep the edge bottom water energy obtained by the model device sufficient; a production device, which is configured to collect the recovery fluid and measure the corresponding recovery data; and a model device, which is respectively connected to the injection device, the edge bottom water simulation device and the production device, and is configured to simulate the porous medium of the oil reservoir. The present invention can simulate the recovery of oil reservoirs in various displacement modes, various well types, different location conditions, and different production stages.

Description

System and method for realizing side bottom water reservoir recovery simulation experiment

Technical Field

The invention relates to the technical field of oil gas development, in particular to a system and a method for realizing a side-bottom water reservoir recovery simulation experiment.

Background

The bottom water oil reservoir in China has a large ratio in all types of oil reservoir reserves, and the reserves are quite rich. In addition to the large number of natural bottom water reservoirs, as fields enter secondary and tertiary recovery, more development features of the fields continue to trend toward bottom water type reservoirs. The bottom water oil reservoir has the characteristic that the oil-containing area is fully contacted with the bottom water, which is not only a place where the bottom water oil reservoir is superior to other oil reservoirs in development, but also a difficulty in the development of the bottom water oil reservoir.

According to the domestic and foreign bottom water oil fields the development experience of (a) shows that: the key technology of the development of the bottom water oil layer is to inhibit water coning or control bottom water coning, prolong the anhydrous oil recovery period of the oil well to the greatest extent and control the uniform displacement of the bottom water so as to achieve the aim of improving the development effect of the bottom water oil layer. The prior technical measures are mainly as follows: optimizing perforation, controlling critical yield and critical pressure difference, and developing a bottom water oil layer and a hit the person work interlayer near an oil-water interface by adopting a horizontal well to block bottom water; and the encryption well adjustment technology, the double-layer well completion technology, the oil-water separate production oil extraction technology and the like are adopted in the middle and later stages of development. With the development and wide application of oil reservoir numerical simulation technology, some main factors influencing the development of a bottom water oil reservoir are revealed by establishing a finer oil reservoir geological model: such as reservoir deposit rhythm, vertical horizontal permeability ratio, spacer size and location, side bottom water energy, oil-water viscosity ratio, well spacing, well string, etc., to determine a more efficient development strategy.

When optimizing oil reservoir development parameters and verifying new technologies, physical simulation experiments are not separated, and how to be more close to the real side bottom water conditions of the simulated oil reservoir is one of the keys of experimental success. Researchers at home and abroad perform a great deal of research on the aspect of physically simulating an oil displacement device, and aim to achieve that the simulation experiment can be closer to the real oil reservoir condition. However, in the existing various physical simulation device technical schemes, some of the existing physical simulation device technical schemes have the problem that the experimental temperature and pressure conditions cannot meet the actual requirements of oil reservoirs, and some of the existing physical simulation device technical schemes have the problem that the side bottom water energy is insufficiently simulated.

Therefore, there is a need in the art to provide an experimental set-up that solves one or more of the problems described above.

Disclosure of Invention

In order to solve the technical problems, the invention provides a system for realizing a side bottom water reservoir recovery simulation experiment, which comprises: an injection device configured to inject an injection medium into the mold device; an edge water simulation device configured to inject an edge water simulation fluid required to satisfy an experiment into the model device and to maintain the edge water obtained by the model device in a sufficient state; a production device configured to collect a recovery fluid and measure corresponding recovery data; the model device is respectively communicated with the injection device, the side bottom water simulation device and the extraction device and is configured to simulate the porous medium of the oil reservoir.

Preferably, the side bottom water simulation device comprises: a fluid simulation unit configured to accommodate the side bottom water simulation fluid and to inject the side bottom water simulation fluid into the mold device under the action of an external pressure; and a pressure control unit configured to provide the external pressure to the side bottom water simulation fluid, and perform pressure monitoring and adjustment, the external pressure being a pressure required for an experiment for controlling the side bottom water simulation fluid to maintain a stable state.

Preferably, the fluid simulation unit is provided with a first container including: a first piston disposed within a cavity of the first container; a first chamber configured on a first side of the first piston, the first chamber having a side bottom water output port, the first chamber for receiving the side bottom water simulation fluid; a second chamber configured on a second side of the first piston, the second chamber configured to create the external pressure with a circulating gas contained therein.

Preferably, the fluid simulation unit is provided with a second container including: a second piston disposed within a cavity of the second container; a third chamber configured to the first side of the second piston, the third chamber configured to equalize the external pressure by injecting a pressurized fluid into the chamber; and the fourth cavity is configured on the second side of the second piston, is communicated with the second cavity and is used for forming the external pressure under the cooperation of the circulating gas contained in the fourth cavity and the circulating gas in the second cavity, so that the side bottom water energy obtained by the model device is kept in a stable state.

Preferably, the modeling device is configured as a holder-type model with a ring pressure applying device or as a core model made of sand-filled material, in which holder the experimental core is installed.

Preferably, the model device is provided with a first interface end, a second interface end and a third interface end, wherein the first interface end is arranged at the first side end surface of the core and is configured to connect the model device with the injection device when simulating an oil displacement stage; the second interface end is arranged at the second side end face of the rock core and is configured to connect the model device with the production device when simulating the oil displacement stage; and the third interface end is arranged along the axial direction of the outer surface of the experimental rock core, and is connected with a side bottom water output port of the side bottom water simulation device, and is configured to connect the model device with the side bottom water simulation device when simulating an oil displacement stage.

Preferably, the model device is provided with a first interface end, a second interface end and a third interface end, wherein the first interface end is arranged at the first side end surface of the core and is configured to be connected with the injection device and the extraction device at the same time when the throughput stage or the failure exploitation stage is simulated; the second interface end is arranged at the second side end face of the rock core, is connected with a side bottom water output port of the side bottom water simulation device and is configured to connect the model device with the side bottom water simulation device when simulating a huff-puff stage or a failure exploitation stage; the third interface end is arranged along the axial direction of the outer surface of the experimental rock core, is connected with the side bottom water output port and is configured to connect the model device with the side bottom water simulation device when simulating the huff-puff stage or the failure exploitation stage.

Preferably, the modeling apparatus is configured as a full diameter core model.

Preferably, the model device is provided with a fourth interface end, a fifth interface end, a sixth interface end and a seventh interface end, wherein the fourth interface end is arranged at the first end face of the core model and is configured to connect the model device with the injection device when simulating the oil displacement stage; the fifth interface end is arranged at the second end face of the core model, is connected with the side bottom water output port of the side bottom water simulation device and is configured to connect the model device with the side bottom water simulation device when simulating an oil displacement stage; the sixth interface end is arranged along a first axial direction of the outer surface of the core model and is configured to connect the model device with the production device when simulating an oil displacement stage; the seventh interface end is arranged along the second axial direction of the outer surface of the core model and is configured to connect the model device with the production device when simulating the oil displacement stage.

Preferably, the model device is provided with a fourth interface end, a fifth interface end, a sixth interface end and a seventh interface end, wherein the fourth interface end is arranged at the first end face of the core model and is configured to connect the model device with the injection device and the extraction device at the same time when simulating a throughput stage or a failure exploitation stage; the fifth interface end is arranged at the second end face of the core model, is connected with a side bottom water output port of the side bottom water simulation device and is configured to connect the model device with the side bottom water simulation device when simulating a huff-puff stage or a failure exploitation stage; the sixth interface end is arranged along a first axial direction of the outer surface of the core model, is connected with the side bottom water output port and is configured to connect the model device with the side bottom water simulation device when simulating a huff-puff stage or a failure exploitation stage; the seventh interface end is arranged along the second axial direction of the outer surface of the core model, is connected with the side bottom water output port and is configured to connect the model device with the side bottom water simulation device when simulating the huff-puff stage or the failure exploitation stage.

Preferably, the system further comprises: and the constant-temperature oven is used for placing the model device in the experimental implementation process.

In another aspect, the present invention also provides a method for implementing a side bottom water reservoir recovery simulation experiment, the method being implemented using a system as described above, wherein the method includes the following steps: experimental parameters were designed including, but not limited to: side bottom water pressure, side bottom water injection amount, core pressure, experimental environment temperature, injection pressure and recovery outlet pressure; connecting the injection device, the side bottom water simulation device and the extraction device with the model device respectively to complete system installation; initializing the experimental parameters, and injecting a side bottom water simulation fluid required by an experiment into the model device by utilizing the side bottom water simulation device so as to keep the side bottom water energy obtained by the model device in a sufficient state; filling injection medium into the model device by the injection device, and starting an experiment; collecting recovery fluid with the production device and measuring corresponding recovery data.

One or more embodiments of the above-described solution may have the following advantages or benefits compared to the prior art:

The invention discloses a system and a method for realizing a side bottom water oil reservoir recovery simulation experiment, in particular to a physical simulation experiment device for indicating the technology of improving recovery ratio of bottom water and side water oil reservoirs. According to the invention, by introducing the side bottom water simulation device, various displacement modes such as water flooding, chemical flooding and the like can be simulated; multiple well types such as a vertical well, a horizontal well and the like can be simulated; the production conditions of the bottom water and the side water under different position conditions can be simulated; the device can simulate displacement and throughput, and simulate the natural energy attenuation development experiment by using side water and bottom water, thereby providing reference and guidance for the application of oilfield development and new technology.

Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.

Drawings

The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate the invention and together with the embodiments of the invention, serve to explain the invention, without limitation to the invention. In the drawings:

fig. 1 is a schematic diagram of the overall structure of a system for implementing a side bottom water reservoir recovery simulation experiment according to an embodiment of the present application.

FIG. 2 is a schematic diagram of a system model device for implementing a side bottom water reservoir recovery simulation experiment as a clamp or sand pack in accordance with an embodiment of the present application.

Fig. 3 is a schematic diagram of a model device in a system for implementing a side bottom water reservoir recovery simulation experiment according to an embodiment of the present application, which is a full-diameter core model.

Fig. 4 is a schematic structural diagram of a side bottom water simulation device in a system for implementing a side bottom water reservoir recovery simulation experiment according to an embodiment of the present application.

Fig. 5 is a schematic diagram of a system structure corresponding to a first type of model applied to oil displacement simulation in a system for implementing a side bottom water reservoir recovery simulation experiment according to an embodiment of the present application.

Fig. 6 is a schematic diagram of a system structure corresponding to a case of performing oil displacement simulation by applying a second model in the system for implementing a side bottom water reservoir recovery simulation experiment according to an embodiment of the present application.

Fig. 7 is a schematic diagram of a system structure corresponding to a system for implementing a side bottom water reservoir recovery simulation experiment when a first model is applied to perform throughput or failure recovery simulation in an embodiment of the present application.

Fig. 8 is a schematic diagram of a system structure corresponding to a case where a second model is applied to perform throughput or failure recovery simulation in a system for implementing a side bottom water reservoir recovery simulation experiment according to an embodiment of the present application.

Fig. 9 is a step diagram of a method for implementing a side bottom water reservoir recovery simulation experiment in accordance with an embodiment of the present application.

Detailed Description

The following will describe embodiments of the present invention in detail with reference to the drawings and examples, thereby solving the technical problems by applying technical means to the present invention, and realizing the technical effects can be fully understood and implemented accordingly. It should be noted that, as long as no conflict is formed, each embodiment of the present invention and each feature of each embodiment may be combined with each other, and the formed technical solutions are all within the protection scope of the present invention.

Therefore, in order to solve the technical problems, the invention provides a system and a method for realizing a side bottom water reservoir recovery simulation experiment. The system and the method comprise the following steps: injection device, side bottom water analogue means, extraction device and model device. The model device is respectively communicated with other devices in the system and is used for simulating porous media at corresponding positions in the oil reservoir; the injection device is used for introducing injection medium into the model device in the experimental implementation process so as to simulate the oil displacement process in the porous medium of the oil reservoir; the side bottom water simulation device is used for injecting side bottom water simulation fluid required by experiments into the model device and keeping the side bottom water obtained by the model device in a sufficient state; the production device is used to collect the recovered fluid and measure the corresponding recovered data. Therefore, the method and the device can simulate the actual recovery condition of the side bottom water reservoir under the conditions of existence of the side bottom water and high temperature and high pressure.

In addition, the invention achieves the effects of injecting fluid to drive oil, injecting fluid to throughput and developing several different modes to simulate by utilizing the attenuation of side bottom water energy by configuring different connection modes for each device in the system. Furthermore, the invention simulates various well type oil reservoirs such as a vertical well, a horizontal well and the like and side bottom water reservoirs at different positions and conditions by configuring different structural characteristics for the model device.

Fig. 1 is a schematic diagram of the overall structure of a system for implementing a side bottom water reservoir recovery simulation experiment according to an embodiment of the present application. The overall structure of a system for implementing a side bottom water reservoir recovery simulation experiment (hereinafter referred to as "experimental system") according to an embodiment of the present application will be described with reference to fig. 1.

As shown in fig. 1, in this embodiment, the experimental system includes at least: injection device 100, side bottom water simulation device 200, model device 300, and production device 400. The modeling apparatus 300 is used for simulating a porous core medium in the edge bottom water reservoir, so as to simulate a rock medium in the edge bottom water reservoir. An experimental core is constructed in the model device 300, and the experimental core can be core samples at different positions in a side bottom water reservoir and has rock characteristics at corresponding positions. Thus, the production conditions of the side bottom water oil reservoirs under different position conditions can be simulated by configuring the experimental cores representing the rock characteristics at different positions in the side bottom water oil reservoirs.

The model apparatus 300 is in communication with other devices within the system, namely the model apparatus 300 is in communication with the injection apparatus 100, the model apparatus 300 is in communication with the side bottom water simulation apparatus 200, and the model apparatus 300 is in communication with the production apparatus 400, respectively.

Further, the injection device 100 is used to introduce an injection medium into the modeling apparatus 300 during the experimental implementation of the (side bottom water reservoir recovery). These implant mediums include, but are not limited to: clear water, oilfield reinjection water, polymer solution, alkali liquor, surfactant solution, compound flooding solution, CO ₂、N₂, air, flue gas, natural gas and the like. These fluid media are primarily used to drive crude oil in the reservoir porous media. Specifically, the injection device 100 includes at least: a reservoir (101, not shown), an injection pump (102, not shown), and an injection pressure monitoring unit (103, not shown). The reservoir 101 is used to store an injection medium. The infusion pump 102 is used to pump the infusion medium required for the experiment into the modeling apparatus 300. An injection pressure monitoring unit (103, not shown) is disposed at the connection interface of the injection device 100 and the model device 300, and is used for monitoring the injection end pressure of the system in real time. In the embodiment of the present invention, the injection pump 102 is one of common fluid injection devices such as a plunger pump and a advection pump, the displacement of the pump is between 1mL/min and 200mL/min, and the displacement is as large as possible.

Further, the production device 400 is used to collect recovery fluid from the modeling device 300 during the (bottomside reservoir recovery) experimental runs and to measure corresponding recovery data. In an embodiment of the present invention, recovery device 400 includes at least: a back pressure device 401 (not shown), a hydro-pneumatic device 402 (not shown), a produced pressure monitoring unit 403 (not shown), and a metering unit 404 (not shown) disposed at different locations. The back pressure device 401 is disposed at the connection interface of the recovery device 400 and the model device 300, and is used for adjusting and controlling the pressure of the outlet end of the system. The oil-gas-water separation device 402 is used to perform oil, water, and gas separation treatments on the recovered fluid. The extraction pressure monitoring unit 403 is disposed at the connection interface of the recovery device 400 and the model device 300, and is used for monitoring the pressure of the outlet end of the system in real time. In embodiments of the present invention, the metering units 404 may be disposed at different locations within the recovery device 400 for measuring data such as recovered crude oil flow, water flow, gas flow, etc. Wherein recovery device 400 is used to obtain recovery data in real-time relating to a side bottom water reservoir recovery scenario, including, but not limited to: total recovery amount of recovery fluid, gas-liquid ratio, oil production, water production, gas production, etc.

Further, the side bottom water simulation device 200 is used to inject the side bottom water simulation fluid required for the experiment into the model device 300 during the implementation of the (side bottom water reservoir recovery) experiment, and enables the model device 300 to obtain sufficient and stable side bottom water energy and keep the energy in a continuously sufficient state. In the embodiment of the present invention, the side bottom water simulation device 200 needs to inject the side bottom water simulation fluid meeting the experimental design requirement into the model device 300 in the experimental implementation process, and under the condition that the side bottom water pressure (external pressure) and the side bottom water injection amount reach the actual design requirement, the system starts to simulate the displacement or throughput or attenuation exploitation of the side bottom water reservoir.

Thus, the present invention utilizes the side water simulation device 200 to simulate the recovery of a reservoir in the presence of side water by providing stable side water energy to the modeling device.

Fig. 4 is a schematic structural diagram of a side bottom water simulation device in a system for implementing a side bottom water reservoir recovery simulation experiment according to an embodiment of the present application. The structure of the bottom water simulation apparatus 200 will be described in detail with reference to fig. 1 and 4. As shown in fig. 1, the edge water simulation device 200 includes: a fluid simulation unit 210 and a pressure control unit 220. The fluid simulation unit 210 is used to receive the side bottom water simulation fluid and inject the side bottom water simulation fluid into the model apparatus 300 under the action of external pressure, thereby providing sufficient side bottom water energy for the simulation experiment. The edge bottom water simulation fluid is used for simulating actual edge bottom water fluid in the edge bottom water reservoir. The pressure control unit 220 is used to provide a stable external pressure to the side bottom water simulation fluid (that is, to perform pressurization and adjustment operations on the side bottom water simulation fluid in the fluid simulation unit 210 by using the external pressure), and to perform monitoring and adjustment of the external pressure. The external pressure is the pressure required for the current side bottom water reservoir recovery simulation experiment to control the side bottom water simulation fluid to maintain a sufficient state (the designed side bottom water pressure required for the experiment). Thus, embodiments of the present application utilize the side bottom water simulator 200 to provide stable side bottom water energy conditions for the modeling apparatus 300. It should be noted that "stable" herein has two aspects: the persistence in the time dimension ensures that the simulation device 300 can continuously obtain the edge water energy from the edge water simulation device 200 in the experimental implementation process; secondly, the sufficiency in the dimension of energy amplitude is guaranteed, so that in the experimental implementation process, the simulation device 300 can also obtain enough side bottom water fluid from the side bottom water simulation device 200 to accurately simulate the actual side bottom water condition in the oil reservoir.

Further, as shown in fig. 4, the fluid simulation unit 210 includes at least: a first container 211. The first container 211 employs a high pressure container. The pressure-resistant capacity of the first vessel 211 is determined according to the actual reservoir pressure, and is preferably 35 to 100MPa. Usually, the pressure is 35MPa, but when a special oil reservoir is encountered, a 70MPa container is needed, and even the pressure can reach 100MPa at most. Wherein the first container 211 includes: a first piston 2111, a first chamber 2112, and a second chamber 2113. The first piston 2111 is provided in the cavity of the first container 211, dividing the entire cavity inside the first container 211 into two cavity spaces. In the embodiment of the present invention, the position of the first container 211 where the first piston 2111 is located is determined according to the size of the experimental core in the modeling apparatus 300. That is, the ratio of the cavity space between the first and second cavities 2112 and 2113 formed by the first piston 2111 is determined according to the size of the experimental core in the modeling apparatus 300.

A first cavity 2112 is configured on a first side of the first container interior cavity. The first chamber 2112 is provided with a side bottom water outlet. The side bottom water outlet serves as an outlet end of the first container 211 for connecting the side bottom water simulator 200 and the model device 300. The first chamber 2112 is for receiving a bottom water simulation fluid. In addition, a second cavity 2113 is configured on a second side of the first container interior cavity. The second chamber 2113 is provided with a flow gas input port. The flow-through gas inlet is used as an inlet end of the first container 211 to connect the fluid simulation unit 210 and the pressure control unit 220 in the side bottom water simulation device 200. The second chamber 2113 is for containing a ventilation gas and uses the ventilation gas contained therein to create a preliminary external pressure. It should be noted that, the initial external pressure is a certain amount of pressure provided to the first chamber 2112, and the cooperation of the pressure control unit 220 is required to form a more stable external pressure.

Further, the fluid simulation unit 210 further includes: the valve 212 provided at the inlet end of the first container 211 (provided between the flow gas inlet and the pressure control unit 220) and the valve 213 provided at the outlet end of the first container 211 (provided between the side bottom water outlet and the modeling apparatus 300) are respectively used to open and close the fluid flow property and/or control the opening degree at the corresponding positions. In addition, the fluid simulation unit 210 further includes: a side bottom water pressure monitoring unit 214 (not shown) disposed at the side bottom water outlet of the first container 211 is used for monitoring the side bottom water pressure (i.e. the external pressure) in real time.

Further, with continued reference to fig. 4, the pressure control unit 220 includes at least: and a second container 221. The second vessel 221 employs a high pressure vessel. The pressure-resistant capacity of the second vessel 221 is determined according to the actual reservoir pressure, and is preferably 35 to 100MPa. Usually, the pressure is 35MPa, but when a special oil reservoir is encountered, a 70MPa container is needed, and even the pressure can reach 100MPa at most. Wherein the second container 221 includes: a second piston 2211, a third cavity 2212, and a fourth cavity 2213. The second piston 2211 is disposed in the cavity of the second container 221, and divides the entire cavity inside the second container 221 into two cavity spaces. A third cavity 2212 is configured at a first side of the interior cavity of the second container 221. The third chamber 2212 is provided with a pressurized inlet. The pressurized inlet serves as an inlet end of the second container 221 for forming a loading pressure of a certain intensity in the third chamber 2212 after pressurized fluid is introduced into the third chamber 2212 by a pressurizing pump described below, thereby balancing an external pressure formed by the external pressure second chamber 2113 and the third chamber 2212 together. In order to better develop an external pressure of sufficient strength, it is necessary to place the second piston 2211 at the top position of the second container 221 at the time of experimental initialization configuration (before the pressurized fluid is introduced). The third cavity 2212 is used for containing pressurized fluid, and external pressure is balanced by injecting the pressurized fluid into the cavity, so that the regulation and control of the external pressure are realized.

In addition, a fourth cavity 2213 is configured at a second side of the internal cavity of the second container 221. The fourth chamber 2213 is provided with a ventilation gas outlet. The ventilation gas output port is connected to the ventilation gas input port through a U-tube as an outlet port of the second container 221, so that the fluid simulation unit 210 (the first container 211) and the pressure control unit 220 (the second container 221) in the side bottom water simulation device 200 are in communication. The fourth chamber 2213 is used for containing ventilation gas, and external pressure is formed under the cooperation of the ventilation gas contained in the third chamber 2212 and the ventilation gas in the second chamber 2113, so that the side bottom water obtained by the model device 300 can be kept in a stable state.

Further, the pressure control unit 220 further includes: a valve 222 provided at an inlet end of the second container 221 (provided between the circulating gas outlet and the circulating gas inlet), and a valve 223 provided at an outlet end of the second container 221 (provided between the pressurizing inlet and a pressurizing pump described below) for opening and/or closing the fluid circulation and/or controlling the opening degree at the corresponding positions. In addition, a valve 224 is provided in the middle of the U-shaped pipe to control the fluid communication, release, or opening. Further, the pressure control unit 220 further includes: a booster pump 225 and a reservoir 226 (not shown). Reservoir 226 is used to store pressurized fluid. The pressurizing pump 225 is used to pump the pressurizing fluid required for the experiment into the third chamber 2212, and regulate and control the magnitude of the external pressure.

In one embodiment, referring to FIG. 4, a side bottom water simulation apparatus 200, consisting essentially of: A. and B, two high-pressure containers with pistons and a pressurizing pump. The high-pressure container A is sequentially provided with a space a for containing side bottom water simulation fluid, a piston b and a space c for containing circulating gas from top to bottom. The side bottom water simulation fluid contained in space a is selected from: one of water produced by stratum, simulated brine and the like is used for simulating fluid of side water and bottom water in a side bottom water oil reservoir. The ventilation gas contained in the space c is a gas which is not easily liquefied, and is preferably one or more of nitrogen, air, and the like (however, carbon dioxide is not advocated to be used). The circulating gas is used for continuously and stably keeping sufficient energy of the side bottom water, and can provide the bottom water energy of 70MPa and 150 ℃.

The high-pressure container B has a similar composition to the high-pressure container a, and the high-pressure container B includes, in order from top to bottom, a space d for containing a pressurized fluid, a piston e, and a space f for containing a circulating gas. The space f for containing the gas is communicated with the space c of the high-pressure container A through a pipeline, and the circulating gas contained in the space f is consistent with the space c and is used for keeping balance of side bottom water energy. The pressurized fluid contained in the space d is preferably one or more of distilled water, deionized water and the like, and the space d is connected with a pressurizing pump and is used for controlling the stability of the simulated side bottom water pressure in real time.

In the use process of the system, the position of the piston b in the high-pressure container A is controlled according to the size of the experimental rock core in the model device 300, so that the energy of the side and bottom water meeting the experimental requirements can be provided for the model in the experimental process. The piston e in the high-pressure container B is placed at the top of the high-pressure container B, the circulating gas is pumped into the corresponding spaces in the two high-pressure containers respectively through the valves 212, 224 and 223 in the opened state by a booster pump (not shown) until the side bottom water (dynamic) pressure monitored in real time reaches the side bottom water pressure (external pressure) required by the experimental design, and the valve 224 is closed. In the experimental process, if the pressure of the side bottom water (dynamic) drops too fast, the stability of the side bottom water pressure is maintained in real time by injecting the pressurized fluid. In simulating the process of throughput exploitation or failure energy exploitation, according to the speed required by pressure decay, partial gases in the space c and the space f are discharged; if the pressure is required to be increased, the pressurization is performed by injecting the pressurized fluid.

Further, in the embodiment of the present invention, the capacities of the high-pressure vessel a (the first vessel 211) and the high-pressure vessel B (the second vessel 221) are set according to the size of the experimental core in the model apparatus 300, and are selected from one of 250mL, 500mL, 1000mL, 2000mL, 5000mL and 10000 mL.

In order to enable the experimental system disclosed by the invention to simulate the production condition of an edge bottom water reservoir under the high-temperature condition, in the embodiment of the invention, the experimental system further comprises: oven 500 is thermostatted. The oven 500 was used to place the modeling apparatus 300 during experimental runs, thereby simulating the actual temperature environment of the bottom water reservoir using the steady temperature conditions provided by the oven 500.

In order to enable the experimental system of the present invention to be suitable for various situations such as different well types, different oil reservoir position conditions, different production stages, etc., different types of experimental core samples and installation modes need to be configured for the model device 300, and/or different combination connection modes between the model device 300 and other devices in the system need to be configured for the model device 300.

Further, the modeling apparatus 300 is configured as a first type of model. The first model is a clamp holder model with a ring pressure applying device, and an experimental rock core (containing rock lithology characteristic information of the corresponding position of the side bottom water reservoir) is arranged in the clamp holder; or the first type of model is a core model made of sand-filled material. FIG. 2 is a schematic diagram of a system model device for implementing a side bottom water reservoir recovery simulation experiment as a clamp or sand pack in accordance with an embodiment of the present application. The first model is a holder model (as shown in fig. 2) which is applied to a natural rock core, an artificial rock core and the like and needs to apply annular pressure. The model uses a core holder to fix an experimental core. Wherein the length range of the experimental core is 5-100 cm. Further, the length of the experimental core is selected from one of 10cm, 30cm, 70cm, and 100cm. Further, the most common core holders are 10cm and 30cm in length.

Further, the shape of the section (end face) of the experimental core clamped by the core holder is not particularly limited, and the section can be any one of square, rectangle, circle, triangle and the like. In addition, the experimental core can be homogeneous or heterogeneous, and the length and the size can be adjusted.

Further, the first type of model may also be configured as an experimental core model made of sand-filled material. Wherein the sand filling material is selected from one of quartz sand, river sand, oil sand and the like. The experimental core length range of the model is 5-100 cm. The length of the experimental core is selected from one of 10cm, 30cm, 70cm and 100cm. In addition, the shape of the section (end face) of the core model is not particularly limited, and the section can be any one of square, rectangle, circle, triangle and the like, and the size of the cross section area can be adjusted. The cross-sectional shape of the core model is preferably circular. Further, when the interface shape is circular, the cross-sectional diameter is selected from one of 1 inch (or 2.5 cm), 1.5 inch (or 3.75 cm). In addition, the pressure bearing of the second model is 70MPa, and the temperature resistance is 150 ℃.

Further, whether the first type of model is a holder type or sand pack type model, a plurality of side water connection interfaces are provided in any one axial direction (third axial direction) of the outer surface of the experimental core for connection with the side water simulation device 200. Meanwhile, a ring pressure contact point is also arranged on the experimental core. The number of the side bottom water connection interfaces is set according to the length of the experimental rock core. In a specific example, the number of the side bottom water connection interfaces is 1-3, and 1 ring pressure connection point is provided, for example: setting 1-2 side bottom water connection interfaces when the length of the experimental rock core is 30 cm; the length of the experimental core is 100cm, and then 3 side bottom water connection interfaces are arranged.

In the practical application process, after the configuration of the side bottom water connection interfaces is completed, one or a part or all of the side bottom water connection interfaces meeting the current destination layer position condition are selected from all the configured side bottom water connection interfaces according to the destination layer positions required to be simulated in the current simulation experiment, and the selected actual side bottom water device connection interfaces are used as actual side bottom water device connection interfaces matched with the destination layer position condition of the current simulation experiment, so that the side bottom water simulation device 200 and the model device 300 are connected by using the selected actual side bottom water device connection interfaces, and other unselected interfaces are plugged. For example: referring to fig. 2, the interface at the middle position is selected to be connected with the side bottom water simulation device 200, and the leftmost and rightmost interfaces are plugged to simulate the production situation at the middle position of the shaft; the rightmost interface is selected to connect with the side bottom water simulator 200 and the leftmost and intermediate interfaces are plugged to simulate production at the bottom of the wellbore, and so on. Therefore, the invention can simulate the production conditions under the condition of side water and bottom water at different positions.

Further, in the embodiment of the present invention, whether the first model is a holder model or a sand-filled model, a plurality of pressure measuring points are also configured in any axial direction (the fourth axial direction, preferably, the third axial direction is opposite to the fourth axial direction) in the outer surface of the experimental core, so as to monitor the pressure state of the core. The number of the pressure measuring points is the same as that of the side bottom water connecting interfaces, and the pressure measuring points are set according to the length of the experimental rock core. In one specific example, there are 1 to 3 pressure taps, such as: setting 1-2 pressure measuring points when the length of the experimental rock core is 30 cm; the length of the experimental core is 100cm, and then 3 pressure measuring points are arranged.

It should be noted that, if the model apparatus 300 is a first type model, and the first type model is placed horizontally, vertically or obliquely, in the experimental implementation process, the production conditions of different types of wells such as a horizontal well, a vertical well, a slope well, and/or the like, and/or the production conditions of the side bottom water reservoirs at different wellbore positions can be simulated, so that the combination configuration of the first type model and the model placement mode thereof is utilized to simulate different scenes.

Further, the model apparatus 300 may also be constructed as a second type model. Fig. 3 is a schematic diagram of a model device in a system for implementing a side bottom water reservoir recovery simulation experiment according to an embodiment of the present application, which is a full-diameter core model. The second model includes: full diameter radial flow core model (as shown in fig. 3), and various shape and specification plate models such as various sizes plate models.

It should be noted that, for the experimental system using the first model, the recovery condition of the side bottom water reservoir under the condition of the horizontal well is mainly simulated, and the horizontal displacement process of the vertical well can be simulated; for experimental systems using the second model described above, it is mainly the simulation of the vertical well radial flow displacement process.

In order to enable the experimental system of the present invention to be suitable for different mining stages, it is necessary to configure the model device 300 for different combination connection modes with other devices in the system.

First, a description will be given of a different model interface arrangement and connection to other devices in the system in the case where the model device 300 is configured as the first type model. When the modeling apparatus 300 is configured as a first type of model, the modeling apparatus 300 has three interface ends, including: the first interface end, the second interface end and the third interface end.

First example

Fig. 5 is a schematic diagram of a system structure corresponding to a first type of model applied to oil displacement simulation in a system for implementing a side bottom water reservoir recovery simulation experiment according to an embodiment of the present application. The interface configuration of the model device and the connection of the model device to other devices in the system for the displacement phase will be described below with reference to fig. 5.

As shown in fig. 5, a first interface port is provided at a first end of the experimental core (in a preferred embodiment, the first interface port is provided at a central location of the first end of the experimental core), and the first interface port is used to connect the model apparatus 300 with the injection apparatus 100 as an interface with the injection apparatus 100 when the system simulates the flooding phase. The second interface end is disposed at a second end face of the experimental core (in a preferred embodiment, the second interface end is disposed at a center position of the second end face of the experimental core), and the second interface end is used to connect the model apparatus 300 with the production apparatus 400 as an interface for connection with the production apparatus 400 when the system simulates the flooding phase. The third interface end (formed by the plurality of side bottom water connection interfaces) is arranged along the axial direction (the third axial direction) of the outer surface of the experimental rock core, and the third interface end is connected with the side bottom water output port of the side bottom water simulation device 200. The third interface end is used for connecting the model device 300 with the side water simulation device 200 when the system simulates the oil displacement stage, so as to be used as an interface for connecting with the side water simulation device 200.

Thus, in the first example, in the model apparatus 300, the connection manner of configuring the independent interface ends for the injection apparatus 100, the extraction apparatus 400 and the side bottom water simulating apparatus 200 respectively is utilized, so that the side bottom water reservoir recovery condition in the displacement scene is simulated by using the holder type model or the sand-filled core model.

Second example

Fig. 7 is a schematic diagram of a system structure corresponding to a system for implementing a side bottom water reservoir recovery simulation experiment when a first model is applied to perform throughput or failure recovery simulation in an embodiment of the present application. The interface configuration of the model device, and the connection of the model device to other devices in the system, applied to the production stage of throughput or failure will be described below with reference to fig. 7. In the practical application process, when the side bottom water reservoir is in the huff-puff or exhaustion stage, the side bottom water reservoir is intersected in the displacement stage and has higher side bottom water energy, and at this time, a designated connection mode needs to be configured for the side bottom water simulation device 200 and the model device 300 so as to adapt to different recovery stage scenes.

As shown in fig. 7, the first interface end is disposed at a first end face of the experimental core (in a preferred embodiment, the first interface end is disposed at a central position of the first end face of the experimental core), and the first interface end is used to connect the model apparatus 300 with the injection apparatus 100 and the extraction apparatus 400 at the same time when the system simulates the throughput phase or the failure exploitation phase, so that the injection apparatus 100 and the extraction apparatus 400 share the same interface end, so that the first interface end is used as a common connection interface of the injection apparatus 100 and the extraction apparatus 400. The second interface end is disposed at the second end surface of the experimental core (in a preferred embodiment, the second interface end is disposed at the center of the second end surface of the experimental core), and the second interface end is connected to the side bottom water output port of the side bottom water simulator 200. The second interface is used to connect the model device 300 with the side water simulator 200 as one of the connection interfaces with the side water simulator 200 when the system simulates the huff-puff phase or the depletion phase. The third interface end (composed of the plurality of side bottom water connection interfaces) is arranged along the axial direction (the third axial direction) of the outer surface of the current experimental rock core, and the third interface end is also connected with the side bottom water output port. The third interface is used to connect the model device 300 with the side water simulator 200 as another connection interface for connecting with the side water simulator 200 when the system simulates a huff-puff phase or a depletion phase.

Thus, in the second example, the gripper-like model or the sand-filled core model is utilized to simulate the recovery of the side bottom water reservoir in the huff-puff or depletion mining scene by configuring the common interface for the injection device 100 and the extraction device 400 and configuring the connection of at least two interface for the side bottom water simulating device 200.

Next, a description will be given of a different model interface arrangement case and a connection case with other devices in the system in the case where the model device 300 is configured as the second model. When the model apparatus 300 is configured as the second type model, the model apparatus 300 has four interface ends including: a fourth interface end, a fifth interface end, a sixth interface end and a seventh interface end.

Third example

Fig. 6 is a schematic diagram of a system structure corresponding to a case of performing oil displacement simulation by applying a second model in the system for implementing a side bottom water reservoir recovery simulation experiment according to an embodiment of the present application. The interface configuration of the model device and the connection of the model device to other devices in the system for the displacement phase will be described below with reference to fig. 6.

As shown in fig. 6, a fourth interface port is provided at the first end of the core model (in a preferred embodiment, the fourth interface port is provided at the center of the first end of the experimental core), and is used to connect the model apparatus 300 with the injection apparatus 100 as an interface to the injection apparatus 100 when the system simulates the flooding phase. The fifth interface end is disposed at the second end surface of the core model (in a preferred embodiment, the fifth interface end is disposed at the center of the second end surface of the experimental core), and the fifth interface end is connected to the side bottom water output port of the side bottom water simulator 200. The fifth interface is used to connect the model device 300 with the side water simulator 200 as an interface for connecting with the side water simulator 200 when the system simulates the flooding phase. The sixth interface end is disposed along the first axial direction of the outer surface of the core model, and is used to connect the model device 300 with the production device 400 as one of the connection interfaces connected with the production device 400 when the system simulates the flooding phase. The seventh interface end is disposed along the second axial direction of the outer surface of the core model, and is used to connect the model apparatus 300 with the production apparatus 400 as another connection interface for connection with the production apparatus 400 when the system simulates the flooding phase.

Thus, in the third example, in the model apparatus 300, the connection manner of configuring the independent interface ends for the injection apparatus 100 and the extraction apparatus 400 and configuring the at least two interface ends for the side bottom water simulating apparatus 200 respectively, so as to implement the simulation of the side bottom water reservoir recovery condition in the displacement scene by using the full-diameter core model.

Fourth example

Fig. 8 is a schematic diagram of a system structure corresponding to a case where a second model is applied to perform throughput or failure recovery simulation in a system for implementing a side bottom water reservoir recovery simulation experiment according to an embodiment of the present application. The interface configuration of the model device, and the connection of the model device to other devices in the system, applied to the production stage of throughput or failure will be described below with reference to fig. 8. In the practical application process, when the side bottom water reservoir is in the huff-puff or exhaustion stage, the side bottom water reservoir is intersected in the displacement stage and has higher side bottom water energy, and at this time, a designated connection mode needs to be configured for the side bottom water simulation device 200 and the model device 300 so as to adapt to different recovery stage scenes.

As shown in fig. 8, a fourth interface is provided at the first end of the core model (in a preferred embodiment, the fourth interface is provided at the center of the first end of the experimental core), and the fourth interface is used to connect the model apparatus 300 with the injection apparatus 100 and the extraction apparatus 400 at the same time when the system simulates the throughput phase or the failure recovery phase, so that the injection apparatus 100 and the extraction apparatus 400 share the same interface, and the fourth interface is used as a common connection interface of the injection apparatus 100 and the extraction apparatus 400. The fifth interface end is disposed at the second end surface of the core model (in a preferred embodiment, the fifth interface end is disposed at the center of the second end surface of the experimental core), and the fifth interface end is connected to the side bottom water output port of the side bottom water simulator 200. The fifth interface is used to connect the model device 300 with the side water simulator 200 as a first connection interface for connecting with the side water simulator 200 when the system simulates a huff-puff phase or a depletion phase. The sixth interface end is arranged along the axial direction (the first axial direction) of the outer surface of the current core model, and is also connected with the side bottom water output port. The sixth interface is used to connect the model device 300 with the side water simulator 200 as a second connection interface for connecting with the side water simulator 200 when the system simulates the huff-puff phase or the depletion phase. The seventh interface end is arranged along the axial direction (second axial direction) of the outer surface of the current core model, and is also connected with the side bottom water output port. The seventh interface is used to connect the model device 300 with the side water simulator 200 as a third connection interface for connecting with the side water simulator 200 when the system simulates the huff-puff stage or the failure recovery stage.

Thus, in the fourth example, in the model apparatus 300, the full diameter core model is utilized to simulate the recovery of the side bottom water reservoir in the huff-puff or failure recovery scenario by configuring the common connection interface for the injection apparatus 100 and the extraction apparatus 400 and configuring the connection of at least three interface for the side bottom water simulating apparatus 200.

In summary, according to the experimental system disclosed by the embodiment of the invention, by introducing the side bottom water simulation device, the experimental system can simulate various displacement modes such as water flooding, chemical flooding and the like; and/or can simulate various well types such as a vertical well, a horizontal well and the like; and/or can simulate the production conditions under the conditions of bottom water and side water (different positions); and/or can simulate displacement, huff and puff and the attenuation development stage of natural energy by utilizing side water and bottom water, thereby providing an experimental device which can be suitable for various different side water reservoir conditions and simulate the technology for improving recovery ratio.

On the other hand, based on the experimental system, the application also provides a method (hereinafter referred to as an experimental method) for realizing the recovery simulation experiment of the side bottom water reservoir, and the method is realized by using the experimental system so as to be suitable for the recovery condition simulation experiment of various different side bottom water reservoir conditions. Fig. 9 is a step diagram of a method for implementing a side bottom water reservoir recovery simulation experiment in accordance with an embodiment of the present application. As shown in fig. 9, step S910 designs corresponding experimental parameters for the current experiment according to the side bottom water reservoir conditions of the current recovery simulation experiment. Among other experimental parameters, including but not limited to: side bottom water pressure, side bottom water injection amount, core pressure, experimental ambient temperature, injection pressure (monitored by an injection pressure monitoring unit), and recovery outlet pressure. After the experimental design is completed, the process proceeds to step S920.

Step S920 connects the injection device 100, the side bottom water simulation device 200, and the production device 400 with the model device 300, respectively, thereby completing the system installation. In step S920, the model type (including the type of the experimental core) of the model apparatus 300, the configuration method of the interface end, and the connection method of the model apparatus 300 and other apparatuses need to be determined, and then, the installation and connection of each component are completed, so that the process proceeds to step S930.

Step S930 performs initialization setting on the experimental parameters designed in step S910, and injects the side bottom water simulation fluid required for the experiment into the model apparatus 300 by using the side bottom water simulation apparatus 200, so that the side bottom water energy obtained by the model apparatus 300 is kept in a sufficient state. In step S930, firstly, an air permeability test is performed on the model apparatus 300, and after the vacuum saturated and saturated oil treatment is performed, the model apparatus 300 is placed in the constant temperature oven 500; then, the first piston 2111 needs to be adjusted to a corresponding position in the first container 211 according to the volume of the experimental core in the model apparatus 300; then, the second piston 2211 is placed at the top position of the second container 221; then, pumping corresponding fluid or gas into the first cavity, the second cavity and the fourth cavity until the external pressure reaches the side bottom water pressure in the experimental parameters; finally, the back pressure of the extraction device 400 is regulated, and the real-time side bottom water pressure is further regulated by means of introducing pressurized fluid, so that various data in experimental parameters are controlled to reach corresponding values. In this way, the initialization configuration process for the current simulation experiment is completed, and the process proceeds to step S940. It should be noted that, the order of each step in the step S930 is not particularly limited, and a person skilled in the art may perform the initialization configuration of the experiment according to the actual requirement.

Step S940 is to introduce injection medium from the injection device 100 into the model device 300 to start the production simulation experiment in the displacement or throughput or failure stage, and collect the recovery fluid by the recovery device 400 and measure and record the recovery data at the corresponding time in real time in step S950. In the experimental implementation process, the data such as pressure, temperature, flow and the like at different positions of the system are monitored in real time, and the data such as side bottom water pressure, core pressure and the like are adjusted in time.

The flow involved in the simulation experiment of different side bottom water reservoir conditions is described below.

First example

When the system implements the oil displacement stage recovery condition simulation experiment, a first model is applied, and referring to fig. 5, a specific operation flow is as follows:

(1) And designing relevant experimental parameters for the current simulation experiment.

(2) The mounting system comprises: the corresponding type of the model device 300 is determined, the model device is horizontally or vertically or obliquely placed, and the side bottom water simulation device is connected with the model device through a six-way valve.

(3) Initializing configuration: carrying out air permeability measurement on the clamp holder model or the sand filling model, vacuumizing saturated water and saturated oil, and putting the clamp holder model or the sand filling model into an oven; according to the total amount of edge bottom water required by the experimental rock core, selecting a high-pressure container A and a high-pressure container B with proper capacities, and placing a piston B at a proper position of the high-pressure container A; a piston e in the high-pressure container B is arranged at the top of the high-pressure container B, and circulating gas is pumped into the two high-pressure containers through a booster pump until the side bottom water pressure of the experimental design is reached; the side bottom water simulation device is connected with the model device, and meanwhile the model device is respectively connected with the injection device and the extraction device, so that the back pressure of the extraction device is regulated, and the side bottom water pressure is regulated in a mode of injecting pressurized fluid.

(4) A production simulation experiment of the displacement phase was started.

(5) Collecting and recording the collected data.

Second example

When the system implements the oil displacement stage recovery condition simulation experiment, a second model is applied, and referring to fig. 6, a specific operation flow is as follows:

(2) The mounting system comprises: the type to which the model apparatus 300 corresponds, etc. are determined.

(3) Initializing configuration: carrying out gas measurement on permeability of the full-diameter core radial flow model, vacuumizing saturated water and saturated oil, and putting the full-diameter core radial flow model into an oven; according to the total amount of edge bottom water required by the experimental rock core, selecting a high-pressure container A and a high-pressure container B with proper capacities, and placing a piston B at a proper position of the high-pressure container A; a piston e in the high-pressure container B is arranged at the top of the high-pressure container B, and circulating gas is pumped into the two high-pressure containers through a booster pump until the side bottom water pressure of the experimental design is reached; connecting the side bottom water simulation device with the model device, connecting the model device with the injection device, selecting part of interfaces to be connected with the extraction device according to the current simulation experiment requirements, and sealing the interfaces of other extraction devices by using a dead plug; the back pressure of the extraction device is regulated, and the side bottom water pressure is regulated by injecting pressurized fluid.

(4) A production simulation experiment of the displacement phase was started.

(5) Collecting and recording the collected data.

Third example

When the system implements the throughput stage recovery condition simulation experiment, a first model is applied, and referring to fig. 7, a specific operation flow is as follows:

(2) The mounting system comprises: and determining the corresponding type of the model device, horizontally or vertically or obliquely placing the model device, and connecting the side bottom water simulation device with the model device through a six-way valve.

(4) And starting to carry out a production simulation experiment in the throughput stage, wherein when the injection medium is introduced, medium fluid in the model enters the space a of the high-pressure container A, so that the real-time dynamic pressure of the side bottom water is increased, and at the moment, the external pressure provided by the side bottom water simulation unit drives the medium fluid out of the model.

(5) Collecting and recording the collected data.

Fourth example

When the system implements the throughput stage recovery condition simulation experiment, a second model is applied, and referring to fig. 8, a specific operation flow is as follows:

(4) And starting a mining simulation experiment of a displacement stage, wherein when an injection medium is introduced, medium fluid in a model enters a space a of a high-pressure container A, so that the real-time dynamic pressure of side bottom water is increased, and at the moment, the external pressure provided by a side bottom water simulation unit drives the medium fluid out of the model.

(5) Collecting and recording the collected data.

Fifth example

When the system implements the failure stage recovery condition simulation experiment, a first model is applied, and referring to fig. 7, a specific operation flow is as follows:

(4) And starting a production simulation experiment in the throughput stage, monitoring the production speed in the failure stage in the laboratory process, and achieving the purpose of controlling the failure production speed by adjusting the pressure of a back pressure valve in the back pressure equipment.

(5) Collecting and recording the collected data.

Sixth example

When the system implements the failure stage recovery condition simulation experiment, a second model is applied, and referring to fig. 8, a specific operation flow is as follows:

(4) And starting a mining simulation experiment in a displacement stage, monitoring the mining speed in a failure stage in the laboratory in the process, and achieving the purpose of controlling the failure mining speed by adjusting the pressure of a back pressure valve in the back pressure equipment.

(5) Collecting and recording the collected data.

The system and the method for realizing the side bottom water reservoir recovery simulation experiment are applied to actual different experimental scenes, and experimental flows corresponding to the scenes are shown as follows:

Scene one

And simulating an oil displacement experiment of the core holder model in the presence of side bottom water.

The core used by the selected holder is a natural bailey core, the diameter is 2.5cm, the length is 30cm, the middle inspection has two pressure measuring points, and two side bottom water inlets are formed. The capacity of the high pressure vessel A, B in the side bottom water simulator used was 250mL.

During experiments, (1) putting the bailey rock core into a rock core holder, adding ring pressure, measuring permeability by gas, vacuumizing saturated water and saturated oil, and putting into an oven; (2) placing the piston b of the high-pressure vessel a in an intermediate position; (3) A piston e in a high-pressure container B is arranged at the top of the high-pressure container B, and circulating gas in a gas cylinder is pumped into the two high-pressure containers through a booster pump until the side bottom water pressure of the experimental design is reached; (4) Connecting the side bottom water simulation device with the model device, and simultaneously connecting with the injection device and the extraction device to regulate back pressure and side bottom water pressure; and (5) starting displacement and collecting data.

Scene two

And simulating the throughput experiment of the full-size rock core radial flow model in the presence of side bottom water.

The selected core is a natural bailey core, the diameter is 11cm, the length is 30cm, four extraction unit interfaces are provided, and 1 side bottom water inlet is provided. The capacity of the high pressure vessel A, B in the side bottom water unit used was 500mL.

During experiments, (1) putting the bailey rock core into a rock core holder, adding ring pressure, measuring permeability by gas, vacuumizing saturated water and saturated oil, and putting into an oven; (2) placing the piston b of the high-pressure vessel a in an intermediate position; (3) A piston e in a high-pressure container B is arranged at the top of the high-pressure container B, and circulating gas in a gas cylinder is pumped into the two high-pressure containers through a booster pump until the side bottom water pressure of the experimental design is reached; (4) Connecting the side bottom water simulation device with the model device, and simultaneously connecting with the injection device and the extraction device to regulate back pressure and side bottom water pressure; (5) Water drives 0.2PV, and then water is discharged from the side bottom for production.

Scene three

And simulating failure exploitation experiments of the full-size rock core radial flow model in the presence of side bottom water.

The selected core is a natural bailey core, the diameter is 11cm, the length is 30cm, four extraction unit interfaces are provided, and 1 side bottom water inlet is provided. The capacity of the high pressure vessel A, B in the side bottom water unit used was 1000mL.

During experiments, (1) putting the bailey rock core into a rock core holder, adding ring pressure, measuring permeability by gas, vacuumizing saturated water and saturated oil, and putting into an oven; (2) Placing the piston b of the high-pressure container A at a position 1/3 away from the bottom; (3) A piston e in a high-pressure container B is arranged at the top of the high-pressure container B, and circulating gas in a gas cylinder is pumped into the two high-pressure containers through a booster pump until the side bottom water pressure of the experimental design is reached; (4) The side bottom water simulation device is connected with the model device and is connected with the injection device and the extraction device at the same time, and the back pressure and the side bottom water pressure are regulated. (5) And (5) regulating the back pressure of the extraction device, and controlling the pressure failure speed production.

The invention discloses a system and a method for realizing a side bottom water oil reservoir recovery simulation experiment, in particular to a physical simulation experiment device for indicating the technology of improving recovery ratio of bottom water and side water oil reservoirs. The side bottom water simulator consists of two high pressure containers with pistons and pumps, and the space c of the high pressure container A is communicated with the space f of the high pressure container B through pipelines, and the gas containing and releasing body keeps balance of side bottom water energy. The fluid in the space d of the high-pressure container B is used for being connected with a pump, and the stability of the dynamic pressure of the side bottom water is controlled in real time. Therefore, by introducing the side bottom water simulation device, various displacement modes such as water drive, chemical drive and the like can be simulated; multiple well types such as a vertical well, a horizontal well and the like can be simulated; the production conditions of the bottom water and the side water under different position conditions can be simulated; the device can simulate displacement and throughput, and simulate the natural energy attenuation development experiment by using side water and bottom water, thereby providing reference and guidance for the application of oilfield development and new technology.

The present invention is not limited to the above-mentioned embodiments, and any changes or substitutions that can be easily understood by those skilled in the art within the scope of the present invention are intended to be included in the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

It is to be understood that the disclosed embodiments are not limited to the specific structures, process steps, or materials disclosed herein, but are intended to extend to equivalents of these features as would be understood by one of ordinary skill in the relevant arts. It is also to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting.

Reference in the specification to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the invention. Thus, the appearances of the phrase "one embodiment" or "an embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment.

While the embodiments of the present invention have been described above, the embodiments are presented for the purpose of facilitating understanding of the invention and are not intended to limit the invention. Any person skilled in the art can make any modification and variation in form and detail without departing from the spirit and scope of the present disclosure, but the scope of the present disclosure is still subject to the scope of the appended claims.

Claims

1. A system for realizing a recovery simulation experiment of an edge-bottom water reservoir, comprising:

an injection device configured to pass an injection medium into the model device, wherein the injection medium is used to displace crude oil in the porous medium of the reservoir;

An edge and bottom water simulation device, configured to inject edge and bottom water simulation fluid that meets the experimental requirements into the model device, and to keep the edge and bottom water energy obtained by the model device sufficient;

a production device configured to collect production fluids and measure corresponding production data;

The model device is connected to the injection device, the edge and bottom water simulation device and the production device respectively, and is configured to simulate the porous medium of the reservoir. The model device is a first type of model or a second type of model. The first type of model is placed horizontally, vertically or inclined, wherein:

In the case where the model device is a first type of model, the model device is provided with a first interface end, a second interface end and a third interface end for the oil displacement stage, including: the first interface end of the current stage is arranged at the first side end face of the experimental core, and is configured to connect the model device with the injection device when simulating the oil displacement stage; the second interface end of the current stage is arranged at the second side end face of the experimental core, and is configured to connect the model device with the production device when simulating the oil displacement stage; and the third interface end of the current stage is arranged along the axial direction of the outer surface of the experimental core, and the third interface end of the current stage is connected to the edge bottom water output port of the edge bottom water simulation device, and is configured to connect the model device with the edge bottom water simulation device when simulating the oil displacement stage;

In the case where the model device is a first type of model, the model device is provided with a first interface end, a second interface end and a third interface end for the throughput stage or the depletion production stage, including: the first interface end of the current stage is arranged at the first side end face of the experimental core, and is configured to connect the model device to the injection device and the production device at the same time when simulating the throughput stage or the depletion production stage; the second interface end of the current stage is arranged at the second side end face of the experimental core, and the second interface end of the current stage is connected to the edge and bottom water output port of the edge and bottom water simulation device, and is configured to connect the model device to the edge and bottom water simulation device when simulating the throughput stage or the depletion production stage; the third interface end of the current stage is arranged along the axial direction of the outer surface of the experimental core, and the third interface end of the current stage is connected to the edge and bottom water output port, and is configured to connect the model device to the edge and bottom water simulation device when simulating the throughput stage or the depletion production stage;

In the case where the model device is a second type of model, the model device is provided with a fourth interface end, a fifth interface end, a sixth interface end and a seventh interface end for the oil displacement stage, including: the fourth interface end of the current stage is arranged at the first end face of the core model, and is configured to connect the model device with the injection device when simulating the oil displacement stage; the fifth interface end of the current stage is arranged at the second end face of the core model, and the fifth interface end of the current stage is connected to the edge and bottom water output port of the edge and bottom water simulation device, and is configured to connect the model device with the edge and bottom water simulation device when simulating the oil displacement stage; the sixth interface end of the current stage is arranged along the first axial direction of the outer surface of the core model, and is configured to connect the model device with the production device when simulating the oil displacement stage; the seventh interface end of the current stage is arranged along the second axial direction of the outer surface of the core model, and is configured to connect the model device with the production device when simulating the oil displacement stage;

In the case where the model device is a second type of model, the model device is provided with a fourth interface end, a fifth interface end, a sixth interface end and a seventh interface end for the throughput stage or the depletion production stage, including: the fourth interface end of the current stage is arranged at the first end face of the core model, and is configured to connect the model device to the injection device and the production device at the same time when simulating the throughput stage or the depletion production stage; the fifth interface end of the current stage is arranged at the second end face of the core model, and the fifth interface end of the current stage is connected to the edge and bottom water output port of the edge and bottom water simulation device, and is configured to connect the model device to the injection device and the production device at the same time when simulating the throughput stage or the depletion production stage. During simulation, the model device is connected to the edge and bottom water simulation device; the sixth interface end of the current stage is set along the first axial direction of the outer surface of the core model, and the sixth interface end of the current stage is connected to the edge and bottom water output port, and is configured to connect the model device to the edge and bottom water simulation device when simulating the throughput stage or the depletion production stage; the seventh interface end of the current stage is set along the second axial direction of the outer surface of the core model, and the seventh interface end of the current stage is connected to the edge and bottom water output port, and is configured to connect the model device to the edge and bottom water simulation device when simulating the throughput stage or the depletion production stage, wherein,

If the model device is a first type of model, the first type of model is placed horizontally, vertically or inclined to simulate the production conditions of different well types of horizontal wells, vertical wells or inclined wells, and/or edge and bottom water reservoirs at different wellbore positions.

2. The system according to claim 1, characterized in that the edge and bottom water simulation device comprises:

a fluid simulation unit, configured to contain the edge-bottom water simulation fluid and inject the edge-bottom water simulation fluid into the model device under the action of external pressure;

The pressure control unit is configured to provide the external pressure to the edge bottom water simulation fluid and perform pressure monitoring and regulation. The external pressure is the pressure required for the experiment to control the edge bottom water simulation fluid to maintain a stable state.

3. The system according to claim 2, wherein the fluid simulation unit comprises a first container, wherein the first container comprises:

a first piston disposed in the cavity of the first container;

A first cavity constructed on a first side of the first piston, having a side and bottom water output port, the first cavity being used to contain the side and bottom water simulation fluid;

A second cavity is constructed on a second side of the first piston, and the second cavity is configured to form the external pressure by utilizing the flow gas contained therein.

4. The system according to claim 3, wherein the fluid simulation unit comprises a second container, wherein the second container comprises:

a second piston disposed in the cavity of the second container;

a third chamber constructed on the first side of the second piston, the third chamber being configured to balance the external pressure by injecting a pressurized fluid into the chamber;

A fourth cavity is constructed on the second side of the second piston, and the fourth cavity is connected to the second cavity. The fourth cavity is used to form the external pressure under the cooperation of the circulating gas contained therein and the circulating gas in the second cavity, so that the edge and bottom water energy obtained by the model device remains in a stable state.

5. The system according to any one of claims 1 to 4, characterized in that the first type of model device is constructed as a clamp-type model with a ring pressure applying device, or a core model made of sand-filled material, and an experimental core is installed in the clamp.

6. The system according to any one of claims 1 to 4, characterized in that the system further comprises: a constant temperature oven, wherein the constant temperature oven is used to place the model device during the experiment.

7. A method for realizing an edge-bottom water reservoir recovery simulation experiment, characterized in that the method is realized by using the system according to any one of claims 1 to 6, wherein the method comprises the following steps:

Designing experimental parameters, which include but are not limited to: edge and bottom water pressure, edge and bottom water injection volume, core pressure, experimental environment temperature, injection pressure and recovery outlet pressure;

Connect the injection device, the edge and bottom water simulation device and the production device to the model device respectively to complete the system installation;

Initializing the experimental parameters, and injecting edge and bottom water simulation fluid that meets the experimental requirements into the model device using the edge and bottom water simulation device, so that the edge and bottom water energy obtained by the model device remains sufficient;

The injection device introduces an injection medium into the model device to start the experiment, wherein the injection medium is used to displace the crude oil in the porous medium of the oil reservoir;

The production device is used to collect production fluid and measure corresponding production data.