CN114251056A - Temperature-controlled drill rod and manufacturing method thereof - Google Patents
Temperature-controlled drill rod and manufacturing method thereof Download PDFInfo
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- CN114251056A CN114251056A CN202011014057.9A CN202011014057A CN114251056A CN 114251056 A CN114251056 A CN 114251056A CN 202011014057 A CN202011014057 A CN 202011014057A CN 114251056 A CN114251056 A CN 114251056A
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- temperature
- pipe
- accommodating space
- heat
- drill rod
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/02—Couplings; joints
- E21B17/04—Couplings; joints between rod or the like and bit or between rod and rod or the like
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Mechanical Engineering (AREA)
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- Environmental & Geological Engineering (AREA)
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- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Earth Drilling (AREA)
Abstract
本发明提出一种控温钻杆及其制造方法，涉及石油钻井机械设备领域，该控温钻杆呈管状且具有轴向贯通的导流腔，控温钻杆包括由内向外依次套设的内管、隔热层和外管，内管的内腔形成导流腔，隔热层的导热系数小于外管的导热系数。本发明提出的控温钻杆及其制造方法能够减少地层热量向钻杆内的钻井液的传递，降低井底温度。
The invention provides a temperature-controlling drill pipe and a manufacturing method thereof, and relates to the field of petroleum drilling machinery and equipment. The inner tube, the thermal insulation layer and the outer tube, the inner cavity of the inner tube forms a diversion cavity, and the thermal conductivity of the thermal insulation layer is smaller than that of the outer tube. The temperature-controlling drill pipe and the manufacturing method thereof proposed by the present invention can reduce the transfer of formation heat to the drilling fluid in the drill pipe and reduce the bottom hole temperature.
Description
Technical Field
The invention relates to the field of petroleum drilling mechanical equipment, in particular to a temperature control drill rod and a manufacturing method thereof.
Background
Drill pipe is an essential component of drill strings, which plays a very important role in oil drilling. The main functions of the drill pipe are to transmit torque and convey drilling fluid, and the borehole is continuously deepened by gradually lengthening the drill pipe. The drill pipe is a conveying channel of the drilling fluid, and the drilling fluid descends along an inner cavity of the drill pipe, passes through the drill bit after reaching the bottom of the well, then ascends along an annular space formed between the outer surface of the drill pipe and the borehole, and returns to the wellhead. As the depth of the well bore is deepened, the temperature of the stratum is gradually increased, and therefore during the descending process of the drilling fluid, the heat of the stratum is transmitted to the drilling fluid in the inner cavity of the drill rod through the wall of the well bore, the annular space and the tube body of the drill rod, so that the temperature of the drilling fluid is gradually increased. For some deep wells and ultra-deep wells, the excessively high bottom temperature has great harm to the performance of drilling fluid, downhole tools and instruments. Specifically, the viscosity, density and rock-carrying performance of the drilling fluid are reduced along with the increase of temperature, the stability of the well wall is reduced, the service life of a downhole tool, particularly a screw drill containing a rubber member, is reduced along with the increase of temperature, the precision and the service life of a downhole instrument are also reduced due to high temperature, the drilling efficiency and safety are finally influenced, and the operation cost is increased. In addition, for some extra-deep wells (the bottom temperature reaches more than 260 ℃) and geothermal wells (the dry heat rock is more than 350 ℃), the ultrahigh temperature of the bottom of the well means that the prior art cannot realize drilling operation and is the bottleneck of drilling, so that the exploration, development and utilization of underground resources are restricted.
In view of the above, the present inventors have designed a temperature-controlled drill rod and a manufacturing method thereof through repeated experiments according to production design experiences in the field and related fields for many years, so as to solve the problems in the prior art.
Disclosure of Invention
The invention aims to provide a temperature-control drill rod and a manufacturing method thereof, which can reduce the transfer of formation heat to drilling fluid in the drill rod and reduce the temperature at the bottom of a well.
In order to achieve the purpose, the invention provides a temperature control drill rod, wherein the temperature control drill rod is tubular and is provided with a flow guide cavity which is axially communicated, the temperature control drill rod comprises an inner pipe, a heat insulation layer and an outer pipe which are sequentially sleeved from inside to outside, the inner cavity of the inner pipe forms the flow guide cavity, and the heat conductivity coefficient of the heat insulation layer is smaller than that of the outer pipe.
The temperature-control drill pipe as described above, wherein the thermal conductivity of the thermal insulation layer is smaller than the thermal conductivity of the inner pipe.
The temperature-control drill rod is characterized in that an annular accommodating space is formed between the inner pipe and the outer pipe in a surrounding manner at intervals, two ends of the accommodating space are closed, and the heat insulation layer is filled in the accommodating space.
The temperature control drill rod comprises an outer pipe, a first installation part, an outer pipe main body and a second installation part, wherein the outer pipe comprises the first installation part, the outer pipe main body and the second installation part which are axially arranged, the inner diameter of the first installation part and the inner diameter of the second installation part are respectively smaller than the inner diameter of the outer pipe main body, two ends of the inner pipe are respectively connected with the first installation part and the second installation part in a sealing mode, the inner pipe and the outer pipe main body are enclosed to form an accommodating space, and the heat insulation layer is filled in the accommodating space.
The accuse temperature drilling rod as above, wherein, first installation department has spacing boss, the internal diameter of spacing boss is less than the internal diameter of first installation department forms spacing step, the one end top of inner tube is supported on the spacing step, wear to be equipped with the spacing ring in the second installation department, the spacing ring top is supported on the other end of inner tube, just the outer wall of spacing ring with the inner wall interference fit of second installation department.
The temperature control drill rod comprises an outer pipe body, wherein two through holes communicated with the accommodating space are formed in the outer walls of the two ends of the outer pipe body, plugging pieces are detachably mounted in the through holes, and the corresponding through holes can be sealed by the plugging pieces.
The invention also provides a manufacturing method of the temperature-control drill rod, which is used for manufacturing the temperature-control drill rod, wherein the manufacturing method of the temperature-control drill rod comprises the following steps:
step 1, providing an outer pipe and an inner pipe, wherein the inner pipe penetrates through the outer pipe, so that a space is formed between the inner pipe and the outer pipe, a containing space with two closed ends is formed, and two through holes communicated with the containing space are formed in the outer walls of the two ends of the outer pipe;
step 2, the heat insulation material is in a flowing state, and the heat insulation material is injected into the accommodating space through one through hole;
and 3, stopping injecting and closing the two through holes after the accommodating space is filled with the heat insulation material, and gradually solidifying the heat insulation material after the heat insulation material is cooled to form a heat insulation layer.
In the manufacturing method of the temperature-controlled drill rod, the two through holes are respectively formed at two ends of the outer pipe, and in the step 2, the other through hole is vacuumized, so that the time for the heat-insulating material to fill the accommodating space is shortened.
In the above method for manufacturing a temperature-controlled drill rod, in step 2, the curing agent is mixed into the heat insulating material, and then the heat insulating material mixed with the curing agent is injected into the accommodating space.
The method for manufacturing the temperature-controlled drill pipe, wherein the heat insulating material is a resin or fiber reinforced resin composite material.
Compared with the prior art, the invention has the following characteristics and advantages:
the invention provides a temperature-control drill rod and a manufacturing method thereof.A heat insulation layer is arranged between an outer pipe and an inner pipe. Because the thermal conductivity of the heat-insulating layer is lower, the total thermal conductivity of the whole temperature-control drill rod is reduced, and the heat transfer resistance of the temperature-control drill rod is increased. Due to the existence of the heat insulation layer, the temperature control drill rod can block the heating of the formation heat to the downlink drilling fluid in the diversion cavity so as to reduce the temperature of the circulating drilling fluid, particularly greatly reduce the temperature of the drilling fluid at the bottom of the well, solve the technical problems caused by high temperature and ultrahigh temperature at the bottom of the well, overcome the technical bottleneck and widen the drilling range in the prior art.
Drawings
The drawings described herein are for illustration purposes only and are not intended to limit the scope of the present disclosure in any way. In addition, the shapes, the proportional sizes, and the like of the respective members in the drawings are merely schematic for facilitating the understanding of the present invention, and do not specifically limit the shapes, the proportional sizes, and the like of the respective members of the present invention. Those skilled in the art, having the benefit of the teachings of this invention, may choose from the various possible shapes and proportional sizes to implement the invention as a matter of case.
FIG. 1 is a schematic structural view of a temperature-controlled drill pipe according to the present invention;
FIG. 2 is a schematic view of an accommodating space defined by an inner tube and an outer tube according to the present invention;
FIG. 3 is a schematic structural view of an outer tube according to the present invention;
FIG. 4 is a schematic view of the structure of the inner tube of the present invention'
FIG. 5 is a cross-sectional view of a temperature controlled drill pipe of the present invention.
Description of reference numerals:
100. controlling the temperature of the drill rod; 10. A flow guide cavity;
20. an inner tube; 30. A thermal insulation layer;
40. an outer tube; 41. A first mounting portion;
42. an outer tube body; 43. A second mounting portion;
44. a through hole; 45. A blocking member;
46. a limiting step; 50. An accommodating space;
60. a limit ring.
Detailed Description
The details of the present invention can be more clearly understood in conjunction with the accompanying drawings and the description of the embodiments of the present invention. However, the specific embodiments of the present invention described herein are for the purpose of illustration only and are not to be construed as limiting the invention in any way. Any possible variations based on the present invention may be conceived by the skilled person in the light of the teachings of the present invention, and these should be considered to fall within the scope of the present invention.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or intervening elements may be present.
As shown in fig. 1 to 5, the temperature control drill rod 100 provided by the present invention is tubular and has a flow guide cavity 10 running through in an axial direction, the temperature control drill rod 100 includes an inner tube 20, a thermal insulation layer 30 and an outer tube 40 sleeved in sequence from inside to outside, an inner cavity of the inner tube 20 forms the flow guide cavity 10, and a thermal conductivity coefficient of the thermal insulation layer 30 is smaller than a thermal conductivity coefficient of the outer tube 40.
The temperature-controlled drill pipe 100 of the present invention has a thermal insulation layer 30 disposed between an outer pipe 40 and an inner pipe 20. Because the thermal conductivity of the thermal insulation layer 30 is low, the total thermal conductivity of the whole temperature control drill rod 100 is also reduced, and the heat transfer resistance of the temperature control drill rod 100 is increased. Due to the existence of the heat insulation layer 30, the temperature control drill rod 100 can prevent the heat of the formation from heating the downward drilling fluid in the diversion cavity 10 so as to reduce the temperature of the circulating drilling fluid, particularly greatly reduce the temperature of the drilling fluid at the bottom of the well, solve the technical problems caused by high temperature and ultrahigh temperature at the bottom of the well in the drilling process, overcome the technical bottleneck and widen the drilling range in the prior art.
The temperature control drill rod 100 provided by the invention can reduce the temperature of the circulating drilling fluid, thereby ensuring the stability of the performance of the drilling fluid and improving the rock-carrying performance of the drilling fluid.
The temperature control drill rod 100 provided by the invention greatly reduces the temperature of the drilling fluid at the bottom of the well, expands the application range of downhole tools and instruments, improves the precision and the service life of the downhole tools and instruments, and reduces the drilling cost.
In an alternative embodiment of the invention, the thermal conductivity of the insulation layer 30 is also less than the thermal conductivity of the inner tube 20.
In an alternative embodiment of the present invention, the inner tube 20 and the outer tube 40 may be steel tubes and the insulation layer 30 may be made of a material having a thermal conductivity lower than that of steel.
In an alternative embodiment of the invention, the insulation layer 30 is a resin insulation layer or a fiber reinforced resin composite insulation layer. In an optional embodiment of the present invention, the thermal conductivity of the thermal insulation layer 30 is 0.1-0.5W/(mK).
According to the known theory of thermodynamics, the smaller the thermal conductivity of the thermal insulation layer 30 is, the larger the total heat transfer resistance of the temperature control drill rod is, and the better the thermal insulation effect is. When the thermal conductivity of the thermal insulation layer 30 is lower than that of the drill pipe by more than one data magnitude, the temperature control drill pipe can block most of heat from being transferred between the inner surface and the outer surface of the drill pipe.
In an alternative example of this embodiment, the material of the thermal insulation layer 30 is epoxy resin, and the thermal conductivity thereof is about 0.2W/(m · K).
In another alternative example of this embodiment, the thermal insulation layer 30 is a composite material of epoxy resin and glass fiber, and has a thermal conductivity of about 0.4W/(m · K), in which the epoxy resin is used as a matrix material and the glass fiber is used as a reinforcement material.
In an optional embodiment of the invention, if the thickness of the heat insulation layer 30 is 2-10 mm and the heat insulation requirement of the temperature control drill rod 100 is high, the thickness of the heat insulation layer 30 is selected to be a large value; if the requirement for thermal insulation of the temperature-controlled drill rod 100 is not high, the value of the thermal insulation layer 30 is selected to be small.
In the present invention, the material and thickness of the thermal insulation layer 30 can be selected according to the requirement of controlling the temperature, and those skilled in the art can select thermal insulation materials with different thermal conductivity according to the actual construction requirement and design a suitable thickness, which is not described herein.
In an alternative embodiment of the present invention, an annular accommodating space 50 is formed between the inner tube 20 and the outer tube 40, two ends of the accommodating space 50 are closed, and the heat insulation layer 30 is filled in the accommodating space 50.
In an alternative example of this embodiment, the outer tube 40 includes a first mounting portion 41, an outer tube main body 42 and a second mounting portion 43 sequentially arranged along an axial direction thereof, an inner diameter of the first mounting portion 41 and an inner diameter of the second mounting portion 43 are respectively smaller than an inner diameter of the outer tube main body 42, two ends of the inner tube 20 are respectively connected with the first mounting portion 41 and the second mounting portion 43 in a sealing manner, an accommodating space 50 is defined between the inner tube 20 and the outer tube main body 42, and the accommodating space 50 is filled with the heat insulating layer 30.
Further, first installation department 41 has spacing boss, and the internal diameter of spacing boss is less than the internal diameter of first installation department and forms spacing step 46, and the one end top of inner tube 20 is supported on spacing step 46, wears to be equipped with spacing ring 60 in the second installation department 43, and spacing ring 60 top is supported at the other end of inner tube 20, and the outer wall of spacing ring 60 and the inner wall interference fit of second installation department 43. The limiting step 46 and the limiting ring 60 play a role in axially limiting the inner pipe 20, so that the inner pipe 20 and the outer pipe 40 are prevented from axially moving, and the normal use of the temperature control drill rod 100 is ensured.
In an alternative example of this embodiment, two through holes 44 communicating with the accommodating space 50 are formed in the outer walls of both ends of the outer tube main body 42, a plugging member 445 is detachably mounted in each through hole 44, and each plugging member 45 can close the corresponding through hole 44.
Furthermore, the through hole 44 is a threaded hole, the plugging member 45 is a screw and is in threaded fit with the threaded hole, and the threaded hole can be closed by tightening the screw.
In an alternative example of this embodiment, first mounting portion 41 and second mounting portion 43 each form a joint for connection to facilitate connection of a plurality of temperature controlled drill rods 100 in series, connection of temperature controlled drill rods 100 to other downhole tools.
In an alternative example of this embodiment, the first and second mounting portions 41 and 43 are respectively connected to the outer tube main body 42 by welding.
The invention also provides a manufacturing method of the temperature-control drill rod, which is used for manufacturing the temperature-control drill rod 100, and the manufacturing method of the temperature-control drill rod comprises the following steps:
step 1, providing an outer tube 40 and an inner tube 20, wherein the inner tube 20 is arranged in the outer tube 40 in a penetrating manner, so that an accommodating space 50 with two closed ends is formed between the inner tube 20 and the outer tube 40 in a spaced and enclosing manner, and two through holes 44 communicated with the accommodating space 50 are formed in the outer walls of the two ends of the outer tube 40;
step 2, the heat insulating material is in a flowing state and is injected into the accommodating space 50 through a through hole 44;
and 3, after the heat insulation material is injected, closing the two through holes 44, and gradually solidifying the heat insulation material after cooling to form the heat insulation layer 30.
The manufacturing method of the temperature-control drill rod provided by the invention comprises the steps of firstly assembling the outer pipe 40 and the inner pipe 20, then injecting heat insulation materials into the accommodating space 50 between the outer pipe 40 and the inner pipe 20, and forming the heat insulation layer 30 after the heat insulation materials are cured. By adopting the method, the thermal insulation layer 30 is prevented from being damaged and extruded when the outer pipe 40 and the inner pipe 20 are assembled, the integrity of the thermal insulation layer 30 is ensured, and the thermal insulation effect of the whole temperature control drill rod 100 is further ensured. The manufacturing method of the temperature-control drill rod provided by the invention has simple steps and can quickly and conveniently manufacture the temperature-control drill rod.
In an alternative embodiment of the invention, in step 2, the insulation material is a liquid resin or a fiber-reinforced base resin, which, when a fiber-reinforced base resin, is followed by a fluid-solid mixture (the fibers are solid).
In an alternative embodiment of the present invention, in step 2, a liquid heat insulating material is injected into the accommodating space 50 through one through hole 44, vacuum is drawn from the accommodating space 50 through the other through hole 44, and filling of the accommodating space with the heat insulating material is accelerated by means of vacuum-drawing and pressurization.
Further, in step 2, the accommodating space 50 is filled with a heat insulating material.
In an optional embodiment of the present invention, in the step 2, the curing agent is mixed into the heat insulating material to form a mixed solution, and then the heat insulating material mixed with the curing agent is injected into the accommodating space 50.
In an alternative example of this embodiment, the curing agent may be a common curing agent known to those skilled in the art, so as to ensure that the heat insulating material can be cured in the accommodating space 50 to form a heat insulating layer, which will not be described herein.
In an alternative embodiment of the invention, the insulating material forming the thermal barrier layer 30 is a resin or fiber reinforced resin matrix composite.
In an alternative example of this embodiment, the material of the thermal insulation layer 30 is epoxy resin, and the thermal conductivity is about 0.2W/(m · K).
In another alternative example of this embodiment, the thermal insulation layer 30 is a composite material of epoxy resin and glass fiber, and has a thermal conductivity of about 0.4W/(m · K), wherein the epoxy resin is used as a matrix material and the glass fiber is used as a reinforcing material.
The present invention is not limited to the above embodiments, and in particular, various features described in different embodiments can be arbitrarily combined with each other to form other embodiments, and the features are understood to be applicable to any embodiment except the explicitly opposite descriptions, and are not limited to the described embodiments.
Claims (10)
1. The utility model provides a accuse temperature drilling rod, its characterized in that, accuse temperature drilling rod is the tubulose and has the water conservancy diversion chamber that the axial is link up, accuse temperature drilling rod includes inner tube, insulating layer and the outer tube that from inside to outside overlaps in proper order and establishes, the inner chamber of inner tube forms the water conservancy diversion chamber, the coefficient of heat conductivity of insulating layer is less than the coefficient of heat conductivity of outer tube.
2. The temperature controlled drill pipe of claim 1, wherein the thermal insulation layer has a thermal conductivity less than a thermal conductivity of the inner pipe.
3. The temperature-control drill rod as claimed in claim 1, wherein a space is formed between the inner pipe and the outer pipe and surrounds the inner pipe and the outer pipe to form an annular accommodating space, two ends of the accommodating space are closed, and the heat-insulating layer is filled in the accommodating space.
4. The temperature-control drill rod as claimed in claim 3, wherein the outer tube comprises a first mounting part, an outer tube main body and a second mounting part which are axially arranged, the inner diameter of the first mounting part and the inner diameter of the second mounting part are respectively smaller than the inner diameter of the outer tube main body, two ends of the inner tube are respectively connected with the first mounting part and the second mounting part in a sealing manner, the inner tube and the outer tube main body are enclosed to form the accommodating space, and the accommodating space is filled with the heat-insulating layer.
5. The temperature-control drill rod as claimed in claim 4, wherein the first installation part is provided with a limit boss, the inner diameter of the limit boss is smaller than that of the first installation part to form a limit step, one end of the inner tube abuts against the limit step, a limit ring penetrates through the second installation part, the limit ring abuts against the other end of the inner tube, and the outer wall of the limit ring is in interference fit with the inner wall of the second installation part.
6. The temperature-control drill rod as claimed in claim 4, wherein two through holes communicated with the accommodating space are formed in outer walls of two ends of the outer tube main body, a plugging member is detachably mounted in each through hole, and each plugging member can close the corresponding through hole.
7. A method of manufacturing a temperature controlled drill pipe, for use in manufacturing a temperature controlled drill pipe according to any one of claims 1 to 6, the method comprising:
step 1, providing an outer pipe and an inner pipe, wherein the inner pipe penetrates through the outer pipe, so that a space is formed between the inner pipe and the outer pipe, a containing space with two closed ends is formed, and two through holes communicated with the containing space are formed in the outer walls of the two ends of the outer pipe;
step 2, injecting the heat insulation material into the accommodating space through the through hole when the heat insulation material is in a flowing state;
and 3, stopping injecting and closing the two through holes after the heat insulation material fills the accommodating space, and gradually solidifying the heat insulation material after the heat insulation material is cooled to form a heat insulation layer.
8. The method according to claim 7, wherein two through holes are formed at both ends of the outer tube, and in step 2, the other through hole is evacuated to shorten the time for filling the accommodating space with the heat insulating material.
9. The method for manufacturing a temperature-controlled drill pipe according to claim 7, wherein in the step 2, the curing agent is mixed into the heat insulating material, and then the heat insulating material mixed with the curing agent is injected into the accommodating space.
10. The method of claim 7, wherein the thermal insulation material is a resin or fiber reinforced resin matrix composite.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011014057.9A CN114251056A (en) | 2020-09-24 | 2020-09-24 | Temperature-controlled drill rod and manufacturing method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011014057.9A CN114251056A (en) | 2020-09-24 | 2020-09-24 | Temperature-controlled drill rod and manufacturing method thereof |
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| Publication Number | Publication Date |
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| CN114251056A true CN114251056A (en) | 2022-03-29 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011014057.9A Pending CN114251056A (en) | 2020-09-24 | 2020-09-24 | Temperature-controlled drill rod and manufacturing method thereof |
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| Country | Link |
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| CN (1) | CN114251056A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115397150A (en) * | 2022-08-22 | 2022-11-25 | 中国海洋石油集团有限公司 | Circuit thermos bottle and preparation process thereof |
| WO2024155839A1 (en) * | 2023-01-18 | 2024-07-25 | National Oilwell Varco, L.P. | Insulated drilling systems and associated methods |
| WO2024231756A1 (en) * | 2023-05-08 | 2024-11-14 | Eavor Technologies Inc. | Temperature control for well drilling |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115397150A (en) * | 2022-08-22 | 2022-11-25 | 中国海洋石油集团有限公司 | Circuit thermos bottle and preparation process thereof |
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| WO2024231756A1 (en) * | 2023-05-08 | 2024-11-14 | Eavor Technologies Inc. | Temperature control for well drilling |
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