CN103161452B - Two-dimensional microscopic visualization simulation experiment device and using method thereof - Google Patents

Abstract

The invention discloses a two-dimensional microscopic visual simulation experiment device and a using method thereof, wherein the two-dimensional microscopic visual simulation experiment device comprises: the first bolt vertically slides in the first groove and fixes the microscope beam to change the inclination angle of the microscope, and the microscope displays and records the flowing process of the fluid in the microscopic simulation transparent pore model; the displacement system is characterized in that a microscopic simulation transparent pore model is fixed in a high-temperature and high-pressure microscopic experiment holder cavity in a sealing mode in the horizontal direction, the model is sealed up and down, an inlet and an outlet are arranged along the diagonal line, and a sealing channel is formed between the inlet and the outlet of the high-temperature and high-pressure microscopic experiment holder; and the model inclination angle control system is characterized in that a high-temperature and high-pressure microscopic experiment holder is fixed in a model semicircular bracket, the model semicircular bracket is fixed on a model base through a second bolt capable of sliding along a second groove, and a semicircular dial disc is fixed on the model base through a third bolt capable of sliding along a third groove. The simulation experiment of the vertical seepage and the plane seepage at any inclination angle of the fluid in the microscopic simulation transparent pore model can be completed.

Description

Two-dimensional microscopic visualization simulation experiment device and using method thereof

technical field

The invention relates to the technical field of oilfield development experiments, in particular to a two-dimensional microscopic visualization simulation experiment device and a use method thereof.

Background technique

The two-dimensional microscopic visualization simulation experiment is an important technical means to accurately characterize the microscopic seepage characteristics of fluid in the porous media of reservoirs under different development modes, and to reveal the microscopic oil displacement mechanism of different development modes. As the injected fluid becomes more and more complex (such as: steam, chemical agents, condensate gas, non-condensate gas, etc.), and the injected reservoir objects become more and more complex, new requirements are put forward for 2D visual microscopic simulation experiments , including: 1) It can characterize the vertical seepage characteristics and oil displacement mechanism of the fluid in the microscopically simulated transparent pore model; 2) It can characterize the planar seepage characteristics and oil displacement mechanism of the fluid in the microscopically simulated transparent pore model with any inclination angle.

Patent CN201273903 proposes a high-temperature and high-pressure microscopic experiment holder, and patent CN200985788 proposes a high-temperature and high-pressure glass microscopic model holder. Next, use the microscopic simulation transparent pore model to conduct two-dimensional microscopic visualization experiments, and use microscopes, cameras, displays and recorders to collect images and videos of the microscopic seepage process and post-processing analysis. However, the disadvantage of patent CN201273903 is that since the high-temperature and high-pressure microscopic experiment holder is fixed on the base of the microscope, the holder does not have the function of rotating at any inclination angle, and can only be used for horizontal microscopic simulation of planar seepage in transparent pore models Simulation experiment; and the disadvantage of patent CN200985788 is that it only illustrates the structural relationship between the model bed base of the clamper and other parts of the clamper, and does not explain whether the clamper has the function of rotating at any inclination angle and realizes this function components. The technical solutions of the above two patents do not specify which technical means are used to realize the vertical seepage of the fluid in the oil layer and the simulation experiment of the plane seepage of the fluid in the oil layer at any inclination angle.

Contents of the invention

The embodiment of the present invention provides a two-dimensional microscopic visualization simulation experiment device, which is used to characterize the vertical seepage characteristics and oil displacement mechanism of the fluid in the microscopically simulated transparent pore model, and the planar seepage characteristics and characteristics of the fluid in the microscopically simulated transparent pore model with any inclination angle Oil displacement mechanism, the device includes:

Imaging system, displacement system and model dip angle control system; where:

The imaging system includes: microscope 1, light-emitting diode LED strong light source 3, first bolt 7, microscope beam 8, column 9, first groove 10, mobile platform 11 and computer 16; the displacement system includes: high temperature and high pressure microscopic experiment clamping Device 2, back pressure valve 17, displacement pump 18 and manual pump 19; model inclination angle control system includes: model semicircle bracket 4, semicircle dial 5, model base 6, second bolt 12, third bolt 13 , the second groove 14, the third groove 15, the ball bearing 20;

The microscope 1 is fixed on the microscope beam 8, and the microscope beam 8 is fixed on the column 9 through the first bolt 7 that can slide in the first groove 10; the microscope 1 is connected with the computer 16 through a data line; the column 9 is vertically fixed on the mobile platform 11 Upper; the first bolt 7 changes the tilt angle of the microscope 1 by sliding up and down in the first groove 10 and fixing the microscope beam 8; The flow process of the fluid in the microscopically simulated transparent pore model in the high-pressure microscopic experiment holder 2; the LED strong light source 3 is located on the second side of the high-temperature and high-pressure microscopic experiment holder 2, and is used to provide light source for the microscopically simulated transparent pore model; the computer 16 It is used to store the images and videos taken by the microscope 1, as well as the pressure and flow data of the displacement pump 18, the manual pump 19 and the back pressure valve 17;

The back pressure valve 17, the displacement pump 18 and the manual pump 19 are connected to the high-temperature and high-pressure microscopic experiment holder 2 through pipelines; the high-temperature and high-pressure microscopic experiment holder 2 adopts electric heating to maintain a constant temperature, and the horizontal direction of the chamber is sealed and fixed to simulate transparent microscopic pores Model; the microscopic simulation transparent pore model is sealed with high-pressure toughened transparent glass up and down, and the inlet and outlet are arranged along the diagonal to form a sealed channel with the inlet and outlet of the high-temperature and high-pressure microscopic experiment holder 2; the displacement pump 18 is used for microscopic simulation. The displacing agent is injected into the transparent pore model; the manual pump 19 is used to provide confining pressure for the high temperature and high pressure microscopic experiment holder 2; the back pressure valve 17 is used to control the back pressure of the microscopically simulated transparent pore model;

The high temperature and high pressure microscopic experiment holder 2 and the LED strong light source 3 are fixed in the model semicircle support 4; The first side of the semicircle is provided with the third semicircular groove 15, and the first side of the model semicircular support 4 and the first side of the semicircular dial 5 are the same side; the left and right sides are symmetrical in the second groove 14 There are two second bolts 12 that can slide along the second groove 14, and two third bolts 13 that can slide along the third groove 15 are symmetrically arranged on the left and right sides of the third groove 15; the model semicircle The shape support 4 is fixed on the model base 6 by the second bolt 12, and the semicircle dial 5 is fixed on the model base 6 by the third bolt 13; the model semicircle support 4 and the semicircle dial 5 are coaxial The semicircular shaft body, the model semicircular bracket 4 and the semicircular dial 5 are connected by ball bearings 20 in the contact gap.

In one embodiment, when the model semicircular support 4 is rotated by 90°, the microscopic simulation transparent pore model in the high temperature and high pressure microscopic experiment holder 2 is vertically erected.

In one embodiment, a zero scale line is provided on the second side of the model semicircle support 4 to record and calibrate the position of the model semicircle support 4 when it is placed horizontally.

In one embodiment, the second side left and right ends of the semicircular dial 5 are evenly distributed with scale lines between 0° and 90°, which are used to indicate that during the rotation of the model semicircle support 4, the model semicircle support The scale of the semicircular dial 5 pointed to by the zero scale line of 4 is the inclination angle of the rotation of the high temperature and high pressure microscopic experiment holder 2 .

The embodiment of the present invention also provides a method of using the above-mentioned two-dimensional microscopic visualization simulation experiment device, which is used to characterize the vertical seepage characteristics and oil displacement mechanism of the fluid in the microscopically simulated transparent pore model, and the fluid in the microscopically simulated transparent pore model with any inclination angle The plane seepage characteristics and oil displacement mechanism, the method includes:

Loosen the second bolt 12, rotate the model semicircle support 4 counterclockwise until the zero scale line on the model semicircle support 4 points to the position where the actual inclination of the oil layer is at the scale line of the semicircle dial 5, then tighten the second bolt 12 The model semicircular support 4 is fixed on the model base 6;

Loosen the first bolt 7, slide the microscope beam 8 down along the first groove 10, until the objective lens of the microscope 1 is parallel to the high-pressure glass window on the top of the high-temperature and high-pressure microscopic experiment holder 2, tighten the first bolt 7 to lock the microscope beam 8 is fixed on the column 9;

Establish the confining pressure of the microscopic simulation transparent pore model and heat up the microscopic simulation transparent pore model;

Use the displacement pump 18 to inject the prepared formation water from the entrance of the high-temperature and high-pressure microscopic experiment holder 2 into the microscopic simulation transparent pore model; at the same time, turn on the LED strong light source 3 and adjust its brightness until it is observed in the objective lens of the microscope 1 Microscopic simulation of fluid flow in transparent pore models;

Use the displacement pump 18 to inject the prepared formation oil from the inlet of the high-temperature and high-pressure micro-experiment holder 2 into the micro-simulation transparent pore model until the outlet water content is 0%, stop the injection, and establish the bound water of the micro-simulation transparent pore model saturation;

Use the displacement pump 18 to inject nitrogen gas from the inlet of the high-temperature and high-pressure microscopic experiment holder 2 into the microscopic simulation transparent pore model, use the microscope 1 to continuously observe the rheological characteristics and oil displacement characteristics of the nitrogen gas bubbles in the microscopic simulation transparent pore model, and use the computer 16 Continuous recording.

In one embodiment, the confining pressure of the microscopically simulated transparent pore model is established, including:

Use the manual pump 19 to inject high-transparency ethylene glycol into the high-temperature and high-pressure micro-experiment holder 2 sealed with a micro-simulated transparent pore model, at an injection rate of 3ml/min, until the pressure reaches 8.5 MPa, and the model confining pressure is established.

In one embodiment, the microscopically simulated transparent pore model is subjected to heating treatment, including:

The electric heating jacket of the high temperature and high pressure microscopic experiment holder 2 is used to heat the high temperature and high pressure microscopic experiment holder 2 to a predetermined temperature of 45°C.

In one embodiment, when using the displacement pump 18 to inject the prepared formation water and formation oil from the entrance of the high-temperature and high-pressure microscopic experiment holder 2 into the microscopic simulation transparent pore model, the injection pressure is 8 MPa, and the high-temperature and high-pressure microscopic experiment holder 2 The outlet back pressure is controlled at 7.7MPa.

In one embodiment, when using the displacement pump 18 to inject nitrogen gas from the inlet of the high-temperature and high-pressure microscopic experiment holder 2 into the microscopic simulation transparent pore model, the injection pressure is 8 MPa, and the outlet back pressure of the high-temperature and high-pressure microscopic experiment holder 2 is controlled at 7.7 MPa, injection speed 0.05ml/min.

In one embodiment, when the model semicircular support 4 is rotated by 90°, the vertical seepage characteristics of the fluid in the microscopically simulated transparent pore model are simulated by injecting from the top inlet of the microscopically simulated transparent pore model and extracting from the bottom outlet.

The two-dimensional microscopic visualization simulation experiment device of the embodiment of the present invention can complete the vertical seepage experiment of the fluid in the microscopic simulation transparent pore model imitating the high temperature and high pressure of the formation, and the plane seepage experiment of the fluid in the microscopic simulation transparent pore model of any inclination angle; available It is used to characterize the vertical seepage characteristics and oil displacement mechanism of the fluid in the microscopically simulated transparent pore model, and the planar seepage characteristics and oil displacement mechanism of the fluid in the microscopically simulated transparent pore model at any inclination angle.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings that need to be used in the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For those skilled in the art, other drawings can also be obtained based on these drawings without creative effort. In the attached picture:

Fig. 1 is the structural representation of the two-dimensional microscopic visualization simulation experiment device in the embodiment of the present invention;

Fig. 2 is the structural schematic diagram of the specific example of two-dimensional microscopic visualization simulation experiment device in the embodiment of the present invention;

Fig. 3 is a schematic diagram of the structure of the two-dimensional microscopic visualization simulation experiment device in the embodiment of the present invention under the condition that the simulated oil layer dip angle is 7°.

Detailed ways

In order to make the purpose, technical solutions and advantages of the embodiments of the present invention more clear, the embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings. Here, the exemplary embodiments and descriptions of the present invention are used to explain the present invention, but not to limit the present invention.

In order to solve the technical problem that the existing device cannot complete the vertical seepage simulation experiment of the fluid in the microscopic simulation transparent pore model and the plane seepage simulation experiment of the fluid in the microscopic simulation transparent pore model at any inclination angle, the embodiment of the present invention provides a two-dimensional microscopic visualization simulation experiment Device and method of use thereof.

FIG. 1 is a schematic structural diagram of a two-dimensional microscopic visualization simulation experiment device in an embodiment of the present invention. As shown in Figure 1, the two-dimensional microscopic visualization simulation experiment device in the embodiment of the present invention may include:

Imaging system, displacement system and model dip angle control system; where:

The imaging system includes: microscope 1, LED (Light Emitting Diode, light emitting diode) strong light source 3, first bolt 7, microscope beam 8, column 9, first groove 10, mobile platform 11 and computer 16; the displacement system includes: high temperature and high pressure Microscopic experiment holder 2, back pressure valve 17, displacement pump 18 and manual pump 19; model inclination angle control system includes: model semicircle support 4, semicircle dial 5, model base 6, second bolt 12, The third bolt 13, the second groove 14, the third groove 15, the ball bearing 20;

The microscope 1 is fixed on the microscope beam 8, and the microscope beam 8 is fixed on the column 9 through the slidable first bolt 7 in the first groove 10; the microscope 1 is connected with the computer 16 through a data line; the column 9 is vertically fixed on the mobile platform 11 Above; the first bolt 7 slides up and down in the first groove 10 and fixes the microscope beam 8, so that the inclination angle of the microscope 1 can be changed along any angle; the microscope 1 is located on the first side of the high temperature and high pressure microscopic experiment holder 2, and is It is used to display and record the flow process of the fluid in the microscopic simulation transparent pore model in the high-temperature and high-pressure microscopic experiment holder 2; the LED strong light source 3 is arranged on the second side of the high-temperature and high-pressure microscopic experiment holder 2, and is used to be transparent to the microscopic simulation. The pore model provides a light source; the computer 16 is used to store the images and videos taken by the microscope 1, and the pressure and flow data of the displacement pump 18, the manual pump 19 and the back pressure valve 17;

The back pressure valve 17, the displacement pump 18 and the manual pump 19 are connected to the high temperature and high pressure microscopic experiment holder 2 through pipelines. The horizontal direction is sealed and fixed with a microscopic simulation transparent pore model. The upper and lower parts of the microscopic simulation transparent pore model are sealed with high-pressure tempered transparent glass. and the outlet to form a sealed channel; the displacement pump 18 is used to inject the displacing agent into the transparent pore model of the microscopic simulation; the manual pump 19 is used to provide confining pressure for the high temperature and high pressure microscopic experiment holder; the back pressure valve 17 is used to control the microscopic simulation Backpressure for transparent pore models;

The high temperature and high pressure microscopic experiment holder 2 and the LED strong light source 3 are fixed in the model semicircle support 4; The first side of the semicircle is provided with the third groove 15 of the semicircle, and the first side of the model semicircle support 4 is the same side as the first side of the semicircle dial 5; the second recess of the model semicircle support 4 In the groove 14, two left and right sides are symmetrically distributed and two second bolts 12 that can slide along the second groove 14 are distributed, and in the third groove 15 of the semicircular dial 5, two left and right sides are symmetrically distributed and can be moved along the third bolt 12. The third bolt 13 of the groove 15 sliding; the model semicircle support 4 is fixed on the model base 6 by the second bolt 12 in the second groove 14, and the semicircle dial 5 passes through the first bolt 12 in the third groove 15 Three bolts 13 are fixed on the model base 6; the model semicircle support 4 and the semicircle dial 5 are coaxial semicircle shafts, and the model semicircle support 4 and the semicircle dial 5 are contacted The ball bearing 20 is connected in the gap.

During specific implementation, a zero scale line can be provided on the second side of the model semicircle support 4 to record and calibrate the position of the model semicircle support 4 when it is placed horizontally.

During specific implementation, the second side left and right ends of the semicircle dial 5 can evenly distribute the scale lines between 0 ° ~ 90 °, which is used to indicate that the model semicircle support 4 rotates during the rotation process of the model semicircle support. The scale of the semicircular dial 5 pointed to by the zero scale line of 4 is the inclination angle of the rotation of the high temperature and high pressure microscopic experiment holder 2 .

FIG. 2 is a schematic structural diagram of a specific example of a two-dimensional microscopic visualization simulation experiment device in an embodiment of the present invention. 2 shows the zero scale line on the second side of the semicircular support 4 of the model, and the scale lines between 0° and 90° evenly distributed at the left and right ends of the second side of the semicircular dial 5 .

During specific implementation, when the model semicircular support 4 rotates 90°, the microscopic simulation transparent pore model in the high-temperature and high-pressure microscopic experiment holder 2 is vertically erected, and is injected from the top inlet of the microscopic simulation transparent pore model and extracted from the bottom outlet. , which can simulate the vertical seepage characteristics of the fluid in the microscopic simulation transparent pore model.

The method for using the two-dimensional microscopic visualization simulation experiment device in the embodiment of the present invention may include:

1. Set the model inclination:

Loosen the second bolt 12, rotate the model semicircle support 4 counterclockwise until the zero scale line on the model semicircle support 4 points to the position where the actual inclination of the oil layer is at the scale line of the semicircle dial 5, then tighten the second bolt 12 The model semicircular support 4 is fixed on the model base 6;

2. Set the tilt angle of the microscope:

Loosen the first bolt 7, slide the microscope beam 8 down along the first groove 10, until the objective lens of the microscope 1 is parallel to the high-pressure glass window on the top of the high-temperature and high-pressure microscopic experiment holder 2, tighten the first bolt 7 to lock the microscope beam 8 is fixed on the column 9;

3. Establish model confining pressure and control model temperature rise:

Establish the confining pressure of the microscopically simulated transparent pore model and heat up the microscopically simulated transparent pore model; wherein, establishing the confining pressure of the microscopically simulated transparent pore model may include, for example: using a manual pump 19 to seal the microscopically simulated transparent pore model Inject high-transparency ethylene glycol into the high-temperature and high-pressure micro-experiment holder 2 at an injection rate of 3ml/min until the pressure reaches 8.5MPa, thereby establishing the model confining pressure; heat-up the micro-simulation transparent pore model, for example, it may include : Use the electric heating jacket of the high-temperature and high-pressure microscopic experiment holder 2 to heat the high-temperature and high-pressure microscopic experiment holder 2 to a predetermined temperature of 45°C; the injection material, injection speed, pressure, and predetermined temperature involved in the previous example can be carried out according to actual needs Adjustment;

4. Saturated water treatment:

Use the displacement pump 18 to inject the prepared formation water from the entrance of the high-temperature and high-pressure microscopic experiment holder 2 into the microscopic simulation transparent pore model; at the same time, turn on the LED strong light source 3 and adjust its brightness until it is observed in the objective lens of the microscope 1 Microscopically simulate the fluid flow in the transparent pore model; among them, the formation water injection pressure can be 8MPa, and the outlet backpressure of the high-temperature and high-pressure microscopic experiment holder 2 can be controlled at 7.7MPa; the injection pressure and outlet backpressure can be adjusted according to actual needs Adjustment;

5. Saturated oil treatment:

Use the displacement pump 18 to inject the prepared formation oil from the inlet of the high-temperature and high-pressure micro-experiment holder 2 into the micro-simulation transparent pore model until the outlet water content is 0%, stop the injection, and establish the bound water of the micro-simulation transparent pore model Saturation; among them, the formation oil injection pressure can be 8MPa, and the outlet back pressure of the high temperature and high pressure microscopic experiment holder 2 can be controlled at 7.7MPa; the injection pressure and outlet back pressure can be adjusted according to actual needs;

6. Nitrogen flooding:

Use the displacement pump 18 to inject nitrogen gas from the inlet of the high-temperature and high-pressure microscopic experiment holder 2 into the microscopic simulation transparent pore model, use the microscope 1 to continuously observe the rheological characteristics and oil displacement characteristics of the nitrogen gas bubbles in the microscopic simulation transparent pore model, and use the computer 16 Continuous video recording; wherein, the nitrogen injection pressure can be 8MPa, the outlet back pressure of the high temperature and high pressure microscopic experiment holder 2 can be controlled at 7.7MPa, and the injection speed can be 0.05ml/min; the injection pressure, outlet back pressure, and injection speed can be Adjust according to actual needs.

During specific implementation, the use method of the two-dimensional microscopic visualization simulation experiment device in the embodiment of the present invention may also include: when the model semicircular support 4 is rotated 90°, injecting from the top inlet of the transparent pore model of the microscopic simulation, and extracting from the bottom outlet , which can simulate the vertical seepage characteristics of the fluid in the micro-simulation transparent pore model.

An example is given below to illustrate the specific experimental process of using the two-dimensional microscopic visualization simulation experimental device of the embodiment of the present invention. In this example, the two-dimensional microscopic visualization simulation experiment device simulates the dip angle of the oil layer as 7°, and other dip angles can also be used in actual implementation, and the experimental process is similar to this.

Fig. 3 is a schematic diagram of the structure of the two-dimensional microscopic visualization simulation experiment device in this example under the condition that the simulated oil layer dip angle is 7°. As shown in Figure 3, the specific experimental process may include:

1. Set the model inclination:

According to the actual inclination angle of the oil layer is 7°, loosen the second bolt 12, and rotate the model semicircle support 4 counterclockwise until the zero scale line on the model semicircle support 4 points to the 7° scale line position of the semicircle dial 5 , tighten the second bolt 12 to fix the model semicircular bracket 4 on the model base 6;

2. Set the tilt angle of the microscope:

Loosen the first bolt 7, slide the microscope beam 8 down along the first groove 10, until the objective lens of the microscope 1 is parallel to the high-pressure glass window on the top of the high-temperature and high-pressure microscopic experiment holder 2, tighten the first bolt 7 to lock the microscope beam 8 is fixed on the column 9;

3. Establish model confining pressure and control model temperature rise:

Utilize the hand pump 19 to inject high-transparency ethylene glycol into the high-temperature and high-pressure micro-experiment holder 2 sealed with a micro-simulation transparent pore model, at an injection rate of 3ml/min, until the pressure reaches 8.5MPa, and the model confining pressure is established; The electric heating jacket of the high-pressure micro-experiment holder 2 heats the high-temperature and high-pressure micro-experiment holder 2 to a predetermined temperature of 45°C;

4. Saturated water treatment:

Use the displacement pump 18 to inject the prepared formation water from the inlet of the high-temperature and high-pressure micro-experiment holder 2 into the microscopic simulation transparent pore model, the injection pressure is 8 MPa, and the outlet back pressure of the high-temperature and high-pressure micro-experiment holder 2 is controlled at 7.7 MPa; At the same time, turn on the LED strong light source 3 and adjust its brightness until the fluid flow in the microscopically simulated transparent pore model can be clearly observed in the objective lens of the microscope 1;

5. Saturated oil treatment:

Use the displacement pump 18 to inject the prepared formation oil from the inlet of the high-temperature and high-pressure micro-experiment holder 2 into the microscopic simulation transparent pore model, the injection pressure is 8 MPa, and the outlet back pressure of the high-temperature and high-pressure micro-experiment holder 2 is controlled at 7.7 MPa, When the outlet water content is 0%, the injection is stopped, and the irreducible water saturation of the microscopically simulated transparent pore model is established;

6. Nitrogen flooding:

Use the displacement pump 18 to inject nitrogen gas from the inlet of the high-temperature and high-pressure microscopic experiment holder 2 into the microscopic simulation transparent pore model, the injection pressure is 8MPa, the outlet back pressure of the high-temperature and high-pressure microscopic experiment holder 2 is controlled at 7.7MPa, and the injection speed is 0.05ml /min, use the microscope 1 to continuously observe the rheological characteristics and oil displacement characteristics of the nitrogen bubbles in the microscopically simulated transparent pore model, and use the computer 16 to record continuously.

During the implementation, the two-dimensional microscopic simulation experiment images were taken by microscope 1 during the nitrogen flooding process. By analyzing the images or videos taken at different times, the microcosmic oil flooding characteristics of nitrogen under different pore sizes and the distribution of remaining oil can be obtained. law.

In summary, the two-dimensional microscopic visualization simulation experiment device of the embodiment of the present invention can complete the vertical seepage experiment of the fluid in the microscopic simulation transparent pore model imitating the high temperature and high pressure of the formation, and the microscopic simulation of the fluid in the transparent pore model at any inclination angle. Plane seepage experiment: it can be used to characterize the vertical seepage characteristics and oil displacement mechanism of the fluid in the microscopically simulated transparent pore model, and the planar seepage characteristics and oil displacement mechanism of the fluid in the microscopically simulated transparent pore model at any inclination angle. At the same time, the difference in seepage characteristics between top injection and bottom injection can be compared, and the influence of different oil layer dip angles on fluid seepage characteristics in porous media can be analyzed.

The specific embodiments described above have further described the purpose, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above descriptions are only specific embodiments of the present invention and are not intended to limit the scope of the present invention. Protection scope, within the spirit and principles of the present invention, any modification, equivalent replacement, improvement, etc., shall be included in the protection scope of the present invention.

Claims (10)

1. a two-dimentional microcosmic visual Simulation experimental facilities, is characterized in that, comprising:

Imaging system, displacement system and model tilt angle control; Wherein:

Imaging system comprises: microscope (1), LED intense light source (3), the first bolt (7), microscope crossbeam (8), column (9), the first groove (10), mobile platform (11) and computer (16); Displacement system comprises: clamping device for high temperature high pressure microscopic experiment (2), back-pressure valve (17), displacement pump (18) and manual pump (19); Model tilt angle control comprises: model semi-circular bracket (4), fan dial (5), model base (6), the second bolt (12), the 3rd bolt (13), the second groove (14), the 3rd groove (15), ball bearing (20);

Microscope (1) is fixed on microscope crossbeam (8), and microscope crossbeam (8) is fixed on column (9) by first bolt (7) that can slide in the first groove (10); Microscope (1) is connected by data wire with computer (16); Column (9) is vertically fixed on mobile platform (11); First bolt (7) by sliding up and down and fixing the inclination angle that microscope crossbeam (8) changes microscope (1) in the first groove (10); Microscope (1) is positioned at the first side of clamping device for high temperature high pressure microscopic experiment (2), for display and the flow process of shooting with video-corder the transparent pore model inner fluid of clamping device for high temperature high pressure microscopic experiment (2) interior microscopic simulation; LED intense light source (3) is positioned at the second side of clamping device for high temperature high pressure microscopic experiment (2), for providing light source to the transparent pore model of microscopic simulation; Computer (16) for store microscope (1) and photograph image, video and displacement pump (18), the pressure of manual pump (19) and back-pressure valve (17) and data on flows;

Back-pressure valve (17), displacement pump (18) and manual pump (19) are connected to clamping device for high temperature high pressure microscopic experiment (2) by pipeline; Clamping device for high temperature high pressure microscopic experiment (2) adopts electrical heating to keep constant temperature, the fixing transparent pore model of microscopic simulation of horizontal direction sealing in cavity; The transparent pore model of microscopic simulation is up and down with the sealing of high pressure tempering clear glass, and diagonally inlet porting and outlet, forms seal channel with the entrance and exit of clamping device for high temperature high pressure microscopic experiment (2); Displacement pump (18) for injecting displacing agent in the transparent pore model of microscopic simulation; Manual pump (19) is for providing confined pressure for clamping device for high temperature high pressure microscopic experiment (2); Back-pressure valve (17) is for controlling the back pressure of the transparent pore model of microscopic simulation;

Clamping device for high temperature high pressure microscopic experiment (2) and LED intense light source (3) are fixed in model semi-circular bracket (4); Semicircular second groove (14) is established in first side of model semi-circular bracket (4), semicircular 3rd groove (15) is established in first side of fan dial (5), and the first side of model semi-circular bracket (4) and the first side of fan dial (5) are homonymy; In second groove (14), the left and right sides is arranged with two second bolts (12) that can slide along the second groove (14), and in the 3rd groove (15), the left and right sides is arranged with two the 3rd bolts (13) that can slide along the 3rd groove (15); Model semi-circular bracket (4) is fixed in model base (6) by the second bolt (12), and fan dial (5) is fixed in model base (6) by the 3rd bolt 13; Model semi-circular bracket (4) is coaxial semicircle axis body with fan dial (5), passes through ball bearing (20) in the gap contacted and be connected between model semi-circular bracket (4) with fan dial (5).

2. two-dimentional microcosmic visual Simulation experimental facilities as claimed in claim 1, is characterized in that, during model semi-circular bracket (4) half-twist, the transparent pore model of microscopic simulation in clamping device for high temperature high pressure microscopic experiment (2) is for standing vertically.

3. two-dimentional microcosmic visual Simulation experimental facilities as claimed in claim 1 or 2, it is characterized in that, the second side of model semi-circular bracket (4) is provided with zero graduation line, with record and calibrating patterns semi-circular bracket (4) horizontal positioned time position.

4. two-dimentional microcosmic visual Simulation experimental facilities as claimed in claim 3, it is characterized in that, second two ends, left and right, side of fan dial (5) are uniformly distributed the graduation mark between 0 ° ~ 90 °, be used to indicate in model semi-circular bracket (4) rotary course, the scale of the fan dial (5) of the zero graduation line sensing of model semi-circular bracket (4) is the inclination angle that clamping device for high temperature high pressure microscopic experiment (2) rotates.

5. a using method for two-dimentional microcosmic visual Simulation experimental facilities described in claim 4, is characterized in that, comprising:

Unclamp the second bolt (12), be rotated counterclockwise model semi-circular bracket (4) until the zero graduation line in model semi-circular bracket (4) points to the actual inclination angle of oil reservoir behind the graduation mark position of fan dial (5), tighten the second bolt (12) and model semi-circular bracket (4) is fixed in model base (6);

Unclamp the first bolt (7), along the first groove (10) slide downward microscope crossbeam (8), until when the object lens of microscope (1) are parallel with the high-pressure glass form at clamping device for high temperature high pressure microscopic experiment (2) top, tighten the first bolt (7) and microscope crossbeam (8) is fixed on column (9);

Set up the confined pressure of the transparent pore model of microscopic simulation and hyperthermic treatment is carried out to the transparent pore model of microscopic simulation;

Utilize displacement pump (18) that the formation water prepared is injected the transparent pore model of microscopic simulation from the entrance of clamping device for high temperature high pressure microscopic experiment (2); Meanwhile, open LED intense light source (3) and regulate its brightness, until observe the fluid flowing in the transparent pore model of microscopic simulation in the object lens of microscope (1);

Utilize displacement pump (18) that the formation oil prepared is injected the transparent pore model of microscopic simulation from the entrance of clamping device for high temperature high pressure microscopic experiment (2), until export moisture when being 0%, stop injecting, set up the irreducible water saturation of the transparent pore model of microscopic simulation;

Utilize displacement pump (18) that nitrogen is injected the transparent pore model of microscopic simulation from the entrance of clamping device for high temperature high pressure microscopic experiment (2), utilize rheology characteristic and the displacement of reservoir oil feature of nitrogen bubble in the transparent pore model of microscope (1) Continuous Observation microscopic simulation, and with computer (16) continuously recording.

6. method as claimed in claim 5, is characterized in that, set up the confined pressure of the transparent pore model of microscopic simulation, comprising:

Utilize manual pump (19) to the middle ethylene glycol injecting the high grade of transparency of the clamping device for high temperature high pressure microscopic experiment (2) being sealed with the transparent pore model of microscopic simulation, injection rate 3ml/min, until pressure reaches 8.5MPa, sets up model confined pressure.

7. method as claimed in claim 5, is characterized in that, carry out hyperthermic treatment, comprising the transparent pore model of microscopic simulation:

Utilize the electric heating cover of clamping device for high temperature high pressure microscopic experiment (2), clamping device for high temperature high pressure microscopic experiment (2) is heated to predetermined temperature 45 DEG C.

8. method as claimed in claim 5, it is characterized in that, when utilizing displacement pump (18) that the formation water for preparing and formation oil are injected the transparent pore model of microscopic simulation from the entrance of clamping device for high temperature high pressure microscopic experiment (2), injection pressure 8MPa, the outlet back pressure of clamping device for high temperature high pressure microscopic experiment (2) controls at 7.7MPa.

9. method as claimed in claim 5, it is characterized in that, when utilizing displacement pump (18) by transparent from the entrance injection microscopic simulation of clamping device for high temperature high pressure microscopic experiment (2) for nitrogen pore model, injection pressure 8MPa, the outlet back pressure of clamping device for high temperature high pressure microscopic experiment (2) controls at 7.7MPa, injection rate 0.05ml/min.

10. method as claimed in claim 5, it is characterized in that, during model semi-circular bracket (4) half-twist, injected by the top entry from the transparent pore model of microscopic simulation, outlet at bottom extraction, the vertical seepage flow characteristics of simulation microscopic simulation transparent pore model inner fluid.