CN116517514B - Injection anti-shearing water distributor - Google Patents
Injection anti-shearing water distributor Download PDFInfo
- Publication number
- CN116517514B CN116517514B CN202310813805.7A CN202310813805A CN116517514B CN 116517514 B CN116517514 B CN 116517514B CN 202310813805 A CN202310813805 A CN 202310813805A CN 116517514 B CN116517514 B CN 116517514B
- Authority
- CN
- China
- Prior art keywords
- hole
- cylinder
- injection
- bypass hole
- piston
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000002347 injection Methods 0.000 title claims abstract description 54
- 239000007924 injection Substances 0.000 title claims abstract description 54
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 46
- 238000010008 shearing Methods 0.000 title claims abstract description 12
- 230000007704 transition Effects 0.000 claims abstract description 4
- 230000002265 prevention Effects 0.000 claims abstract 2
- 238000007789 sealing Methods 0.000 claims description 23
- 230000000903 blocking effect Effects 0.000 claims description 9
- 230000007246 mechanism Effects 0.000 claims description 7
- 229910001220 stainless steel Inorganic materials 0.000 claims description 3
- 239000010935 stainless steel Substances 0.000 claims description 3
- 239000007788 liquid Substances 0.000 abstract description 12
- 229920000642 polymer Polymers 0.000 abstract description 12
- 230000009471 action Effects 0.000 abstract description 8
- 238000000034 method Methods 0.000 abstract description 7
- 230000008569 process Effects 0.000 abstract description 7
- 230000008859 change Effects 0.000 abstract description 5
- 230000014759 maintenance of location Effects 0.000 abstract description 3
- 239000000243 solution Substances 0.000 abstract description 3
- 235000017166 Bambusa arundinacea Nutrition 0.000 description 8
- 235000017491 Bambusa tulda Nutrition 0.000 description 8
- 241001330002 Bambuseae Species 0.000 description 8
- 235000015334 Phyllostachys viridis Nutrition 0.000 description 8
- 239000011425 bamboo Substances 0.000 description 8
- 210000000078 claw Anatomy 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 210000001503 joint Anatomy 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 239000003129 oil well Substances 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 235000020681 well water Nutrition 0.000 description 1
Classifications
-
- 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
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
- E21B43/20—Displacing by water
-
- 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
- E21B34/00—Valve arrangements for boreholes or wells
- E21B34/06—Valve arrangements for boreholes or wells in wells
-
- 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
- E21B2200/00—Special features related to earth drilling for obtaining oil, gas or water
- E21B2200/05—Flapper valves
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Abstract
A water distributor for polymer injection and shearing prevention relates to the technical field of downhole tools in oil fields. The lower bypass hole and the upper bypass hole are square holes, when the rotating cylinder rotates to ascend and descend, the sliding block moves left and right under the guide of the dovetail groove guide rail, the stroke of the piston covers the lower bypass hole, a buffer hole with gradually enlarged area is formed in the upper side of the upper bypass hole, and a transition hole with enlarged diameter is formed in the upper portion of the bridge type channel. The injection liquid enters the water distributor from the upper joint, flows to the water injection hole from the upper bypass hole and the lower bypass hole to be injected into the stratum, the flowing direction of the liquid is not changed, the flow speed of the liquid is slowly changed under the action of the buffer holes, the mechanical shearing action of the liquid in the injection process is reduced, the viscosity loss of polymer solution is reduced, the viscosity retention rate of the profile control process is ensured, the square lower bypass hole is in a fixed functional relation between the change of the sectional area of the arc-shaped square hole and the stroke of the piston when the piston moves, and the injection flow can be accurately calculated.
Description
Technical Field
The invention relates to the technical field of oilfield downhole tools, in particular to a polymer injection shearing-resistant water distributor.
Background
The quality and performance of the water injection tool and instrument are the basis of the implementation of the water injection technology, the quality and performance of the water injection tool and instrument have a decisive effect on the development of the water injection technology, the bridge type concentric separate injection technology consists of a bridge type concentric water distributor, a concentric electric underground measuring and adjusting instrument, an electric seal checking instrument and a ground controller, the bridge type concentric water distributor is provided with a bridge type channel, partial water flows into a water nozzle through the bridge type channel in a split mode, the diameter and the flow channel change greatly, the shear stability of injected polymers is poor in the process of three-mining injection polymerization, the viscosity of the injected polymers is greatly reduced (up to 50 percent) due to the fact that the injected polymers are subjected to large shear force in the injection of high pressure difference, and the performance of the polymers is seriously influenced.
Disclosure of Invention
In order to solve the problem that the polymer shear rate is high when the current water distributor is used for injection, a water distributor for injection and anti-shearing is developed.
The technical scheme provided by the invention is as follows: the utility model provides a water injection shearing-resistant water distributor, including the top connection, the upper connection section of thick bamboo is connected in a sealing manner to the upper connection section of thick bamboo lower part, the main barrel lower part is connected in a sealing manner to the lower connection section of thick bamboo, the lower connection section of thick bamboo lower part is connected in a sealing manner to the lower connection section of thick bamboo, the bridge type passageway that link up from top to bottom is equipped with in the main barrel, the main barrel lower extreme passes through bolted connection positioning cylinder, the positioning cylinder downside is opened there is the constant head tank, main barrel center is opened there is last step hole and lower step hole, the diameter of last step hole is greater than lower step hole, go up step hole threaded connection rotation section of thick bamboo, rotation section of thick bamboo upper portion is opened there is the adjustment tank, rotation section of thick bamboo lower part and lower step hole pass through sealing washer clearance fit connection, main barrel up end is opened there is downwardly extending's upper bypass hole, main barrel one side is opened there is the side hole, upper bypass hole extends to the up end of side hole, be equipped with adjustment mechanism in the side hole;
the adjusting mechanism comprises a T-shaped ring on a rotating cylinder, a sliding rail is hung on the T-shaped ring, the sliding rail is wrapped on the outer side of the T-shaped ring, the outer side of the sliding rail is connected with a sliding block through a dovetail groove guide rail, the dovetail groove guide rail is in an oblique angle with the center line of a main cylinder, a side hole is a square hole, a blocking body is arranged in the side hole and is connected to the main cylinder through a sealing ring and a bolt, a transverse water injection hole is formed in the blocking body, a piston is arranged in the water injection hole, the piston is connected with the water injection hole through a sealing ring clearance fit, the piston and the sliding block are of an integrated structure, a lower bypass hole is formed in the upper side of the water injection hole and is communicated with the upper bypass hole, and a sealing ring is arranged at the connecting part of the upper bypass hole and the lower bypass hole.
The lower bypass hole and the upper bypass hole are square holes, and when the rotating cylinder rotates to ascend and descend, the sliding block moves left and right under the guide of the dovetail groove guide rail, and the stroke of the piston covers the lower bypass hole.
The main cylinder body is provided with buffer holes with gradually enlarged areas at the upper side of the upper bypass holes, and the upper part of the bridge type channel is provided with transition holes with enlarged diameters.
The integral structure is made of stainless steel.
The beneficial effects of the invention are as follows: when the adjusting claw of the testing instrument is in butt joint with the adjusting groove on the rotating cylinder to drive the rotating cylinder to rotate, the rotating cylinder moves up and down, the T-shaped ring of the rotating cylinder drives the sliding rail to move up and down when moving up and down, the sliding block and the piston move left and right under the action of the inclined dovetail groove guide rail, the piston moves left and right to change the sectional area of the inlet of the lower bypass hole and the water injection hole, adjust the water injection flow rate and even close the injection channel, thus realizing stopping injection, injecting liquid can flow from the bridge channel to other injection layers after stopping injection, avoiding polymer from staying in the water distributor of the layer to be degraded, injecting liquid enters the water distributor from the upper joint, and flows from the upper bypass hole and the lower bypass hole to the water injection hole to inject stratum, the flowing direction of the liquid is not greatly changed, the flow rate of the liquid slowly changes under the action of the buffer hole, the mechanical shearing action received in the injection process is reduced, the viscosity loss of the polymer solution is reduced, the viscosity retention rate of the profile control process is ensured, the intersection of the square lower bypass hole and the water injection hole is an arc square opening, and the change of the sectional area of the arc square opening and the piston is in the fixed function of the injection flow rate when the piston moves.
Drawings
FIG. 1 is a schematic diagram of the structure of the present invention;
FIG. 2 is a section A-A of FIG. 1;
fig. 3 is an enlarged view at B of fig. 1.
In the figure, the upper joint 1, the upper connecting cylinder 2, the main cylinder 3, the lower connecting cylinder 4, the lower joint 5, the rotating cylinder 6, the positioning cylinder 7, the bridge channel 8, the lower step hole 9, the upper step hole 10, the upper bypass hole 11, the device comprises a 12-adjusting mechanism, a 13-buffer hole, a 14-transition hole, a 15-side hole, a 16-T-shaped ring, a 17-sliding rail, a 18-sliding block, a 19-lower bypass hole, a 20-water injection hole, a 21-piston, a 22-blocking body and a 23-dovetail groove guide rail.
Detailed Description
As shown in fig. 1-3, the injection shearing-resistant water distributor comprises an upper joint 1, wherein the lower part of the upper joint 1 is in sealing connection with an upper connecting cylinder 2, the lower part of the upper connecting cylinder 2 is in sealing connection with a main cylinder body 3, the lower part of the main cylinder body 3 is in sealing connection with a lower connecting cylinder 4, the lower part of the lower connecting cylinder 4 is in sealing connection with a lower joint 5, a bridge type channel 8 which penetrates up and down is arranged in the main cylinder body 3, the lower end of the main cylinder body 3 is connected with a positioning cylinder 7 through a bolt, a positioning groove is formed in the lower side of the positioning cylinder 7, an upper step hole 10 and a lower step hole 9 are formed in the center of the main cylinder body 3, the diameter of the upper step hole 10 is larger than that of the lower step hole 9, the upper step hole 10 is in threaded connection with a rotating cylinder 6, an adjusting groove is formed in the upper part of the rotating cylinder 6, the lower part of the rotating cylinder 6 is in clearance fit connection with the lower step hole 9 through a sealing ring, an upper side hole 11 which extends downwards is formed in the upper end face of the main cylinder body 3, a side hole 15 is formed in one side of the main cylinder body 3, the side hole 11 extends to the upper end face of the side hole 15, and an adjusting mechanism 12 is arranged in the side hole 15;
the regulating mechanism 12 comprises a T-shaped ring 16 on the rotary cylinder 6, a sliding rail 17 is hung on the T-shaped ring 16, the sliding rail 17 is wrapped on the outer side of the T-shaped ring 16, the outer side of the sliding rail 17 is connected with a sliding block 18 through a dovetail groove guide rail 23, the dovetail groove guide rail 23 and the central line of the main cylinder 3 form an oblique angle, a side hole 15 is a square hole, a blocking body 22 is installed in the side hole 15, the blocking body 22 is connected onto the main cylinder 3 through a sealing ring and a bolt, a transverse water injection hole 20 is formed in the blocking body 22, a piston 21 is arranged in the water injection hole 20, the piston 21 is connected with the water injection hole 20 through a sealing ring clearance fit, the piston 21 and the sliding block 18 are of an integral structure, the blocking body 22 is provided with a lower bypass hole 19 on the upper side of the water injection hole 20, the lower bypass hole 19 is communicated with the upper bypass hole 11, and a sealing ring is arranged at the connecting part of the upper bypass hole 11 and the lower bypass hole 19.
The testing instrument is placed into an oil well water distributor, the positioning claw of the testing instrument is in butt joint with the positioning groove on the positioning cylinder 7, anti-reversing force is provided for testing and adjusting, when the adjusting claw of the testing instrument is in butt joint with the adjusting groove on the rotating cylinder 6 and then drives the rotating cylinder 6 to rotate, the rotating cylinder 6 moves up and down, the T-shaped ring 16 of the rotating cylinder 6 drives the sliding rail 17 to move up and down when moving up and down, the sliding block 18 and the piston 21 move left and right under the action of the inclined dovetail groove guide rail 23, the cross section area of the inlet of the lower bypass hole 19 and the water injection hole 20 can be changed by moving left and right of the piston 21, the water injection flow is adjusted, and even the injection channel is closed, so that stopping injection is realized, injection liquid can flow from the bridge channel 8 to other injection layers after stopping injection of the layer, and polymer is prevented from staying in the water distributor for the layer to degrade.
The lower bypass hole 19 and the upper bypass hole 11 are square holes, when the rotary cylinder 6 rises and falls in a rotating mode, the sliding block 18 moves left and right under the guide of the dovetail groove guide rail 23, the stroke of the piston 21 covers the lower bypass hole 19, the intersection of the square lower bypass hole 19 and the water injection hole 20 is an arc square opening, when the piston 21 moves, the plane at the front end of the piston gradually covers the arc square opening, the width B of the arc square opening is unchanged, the length L is continuously reduced, the sectional area S=B× (L-stroke of the piston) of the arc square opening is a fixed functional relation between the change of the sectional area of the arc square opening and the stroke of the piston 21, and the injection flow can be accurately calculated.
The main cylinder body 3 is provided with a buffer hole 13 with gradually enlarged area on the upper side of the upper bypass hole 11, the upper part of the bridge channel 8 of the main cylinder body 3 is provided with a transition hole 14 with enlarged diameter, the injected liquid enters the water distributor from the upper joint 1, flows to the water injection hole 20 from the upper bypass hole 11 and the lower bypass hole 19 to be injected into a stratum, the flowing direction of the liquid is not greatly changed, the flow speed of the liquid is slowly changed under the action of the buffer hole 13, the mechanical shearing action received in the injection process is reduced, the viscosity loss of polymer solution is reduced, and the viscosity retention rate in the profile control process is ensured.
The integral structure is made of stainless steel.
Claims (2)
1. The utility model provides a water injection and shearing prevention water distributor, includes top connection (1), its characterized in that: the lower part of the upper joint (1) is connected with the upper connecting cylinder (2) in a sealing way, the lower part of the upper connecting cylinder (2) is connected with the main cylinder body (3) in a sealing way, the lower part of the main cylinder body (3) is connected with the lower connecting cylinder (4) in a sealing way, the lower part of the lower connecting cylinder (4) is connected with the lower joint (5) in a sealing way, a bridge type channel (8) which runs through from top to bottom is arranged in the main cylinder body (3), the lower end of the main cylinder body (3) is connected with the positioning cylinder (7) through a bolt, a positioning groove is formed in the lower side of the positioning cylinder (7), an upper step hole (10) and a lower step hole (9) are formed in the center of the main cylinder body (3), the diameter of the upper step hole (10) is larger than that of the lower step hole (9), the upper step hole (10) is connected with the rotating cylinder (6) in a threaded way, an adjusting groove is formed in the upper part of the rotating cylinder (6), the lower part of the rotating cylinder (6) is connected with the lower step hole (9) through a clearance fit of a sealing ring, an upper bypass hole (11) which extends downwards, one side hole (15) is formed in one side of the main cylinder body (3), the side of the upper cylinder (11) extends to the upper end face of the side hole (15), and an adjusting mechanism (12) is arranged in the side hole (15);
the adjusting mechanism (12) comprises a T-shaped ring (16) on the rotary cylinder (6), a sliding rail (17) is hung on the T-shaped ring (16), the sliding rail (17) is wrapped on the outer side of the T-shaped ring (16), the outer side of the sliding rail (17) is connected with a sliding block (18) through a dovetail groove guide rail (23), the dovetail groove guide rail (23) and the central line of the main cylinder (3) form an oblique angle, a side hole (15) is a square hole, a blocking body (22) is arranged in the side hole (15), the blocking body (22) is connected onto the main cylinder (3) through a sealing ring and a bolt, a transverse water injection hole (20) is formed in the blocking body (22), a piston (21) is connected with the water injection hole (20) through a clearance fit of the sealing ring, the piston (21) and the sliding block (18) form an integrated structure, a lower side hole (19) is formed in the upper side of the water injection hole (20), the lower side hole (19) is communicated with the upper side hole (11), and a sealing ring is arranged at the connecting part of the upper side hole (11) and the lower side hole (19);
the lower bypass hole (19) and the upper bypass hole (11) are square holes, and when the rotary cylinder (6) is rotated, lifted and lowered, the sliding block (18) moves left and right under the guide of the dovetail groove guide rail (23) and the stroke of the piston (21) covers the lower bypass hole (19);
the upper side of the upper bypass hole (11) is provided with a buffer hole (13) with gradually enlarged area, and the upper part of the bridge channel (8) is provided with a transition hole (14) with enlarged diameter.
2. The injection shearing resistant water distributor as defined in claim 1, wherein: the integral structure is made of stainless steel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310813805.7A CN116517514B (en) | 2023-07-05 | 2023-07-05 | Injection anti-shearing water distributor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310813805.7A CN116517514B (en) | 2023-07-05 | 2023-07-05 | Injection anti-shearing water distributor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN116517514A CN116517514A (en) | 2023-08-01 |
| CN116517514B true CN116517514B (en) | 2023-09-08 |
Family
ID=87401594
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310813805.7A Active CN116517514B (en) | 2023-07-05 | 2023-07-05 | Injection anti-shearing water distributor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116517514B (en) |
Citations (22)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4204574A (en) * | 1977-09-22 | 1980-05-27 | Conoco, Inc. | Low shear polymer injection method with ratio control between wells |
| GB8322586D0 (en) * | 1982-08-25 | 1983-09-28 | Getty Oil Co | Flow rate control and metering means |
| CN2427627Y (en) * | 2000-04-30 | 2001-04-25 | 大庆油田有限责任公司第四采油厂 | Concentric injection and oil collection means |
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| CN201173106Y (en) * | 2008-02-02 | 2008-12-31 | 李运柱 | Bridge type eccentric water distributing apparatus |
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| CN201730602U (en) * | 2010-01-19 | 2011-02-02 | 大庆油田有限责任公司 | Low-shearing anti-blockage injection distributor |
| CN104963665A (en) * | 2015-06-16 | 2015-10-07 | 中国石油天然气股份有限公司 | Bridge type concentric profile control water distribution device |
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| NO20151750A1 (en) * | 2015-12-18 | 2017-06-19 | Typhonix As | Polymer flow control device |
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| CN109339748A (en) * | 2018-09-11 | 2019-02-15 | 中国海洋石油集团有限公司 | A kind of poly- dispenser of water suitable for offshore oilfield |
| CN209179745U (en) * | 2018-09-07 | 2019-07-30 | 中国石油化工股份有限公司 | A kind of anti-return of polymer spits low sheraing distributor |
| CN211008600U (en) * | 2019-10-11 | 2020-07-14 | 大庆市盛鑫通石油机械设备制造有限公司 | Polymer low-shear anti-reverse-spitting injection allocation device |
| CN211174039U (en) * | 2019-10-11 | 2020-08-04 | 大庆市世纪龙石油科技开发有限公司 | Anti-reverse-spitting blanking plug |
| CN215408589U (en) * | 2021-04-09 | 2022-01-04 | 席小平 | Adjustable water distributor |
| CN215408588U (en) * | 2021-04-09 | 2022-01-04 | 席小平 | Bridge type concentric water distributor |
| CN114837618A (en) * | 2022-05-11 | 2022-08-02 | 杜凤修 | Anti-scale water distributor |
| CN115110931A (en) * | 2022-07-22 | 2022-09-27 | 中国石油化工股份有限公司 | Characterization method for pressure flooding water injection permeability increasing degree of low-permeability reservoir |
| CN217538665U (en) * | 2022-06-08 | 2022-10-04 | 阜新市石油工具厂 | Sand-proof bridge type concentric water distributor |
| CN218150885U (en) * | 2022-11-02 | 2022-12-27 | 四川省科学城久利电子有限责任公司 | A adjustable injection mandrel of whole well for injecting polymer |
| CN116020297A (en) * | 2021-10-22 | 2023-04-28 | 中国石油化工股份有限公司 | Mixing device and thick oil viscosity reduction compound flooding water injection well mixing system |
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|---|---|---|---|---|
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| GB8322586D0 (en) * | 1982-08-25 | 1983-09-28 | Getty Oil Co | Flow rate control and metering means |
| CN2427627Y (en) * | 2000-04-30 | 2001-04-25 | 大庆油田有限责任公司第四采油厂 | Concentric injection and oil collection means |
| CN201173106Y (en) * | 2008-02-02 | 2008-12-31 | 李运柱 | Bridge type eccentric water distributing apparatus |
| CN101270648A (en) * | 2008-05-20 | 2008-09-24 | 中国海洋石油总公司 | Shunting injection allocation method and shunting injection allocation machine |
| CN201730602U (en) * | 2010-01-19 | 2011-02-02 | 大庆油田有限责任公司 | Low-shearing anti-blockage injection distributor |
| CN201723805U (en) * | 2010-06-25 | 2011-01-26 | 上海一诺仪表有限公司 | High and low-pressure non-shearing flow regulating valve |
| CN104963665A (en) * | 2015-06-16 | 2015-10-07 | 中国石油天然气股份有限公司 | Bridge type concentric profile control water distribution device |
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| CN215408589U (en) * | 2021-04-09 | 2022-01-04 | 席小平 | Adjustable water distributor |
| CN215408588U (en) * | 2021-04-09 | 2022-01-04 | 席小平 | Bridge type concentric water distributor |
| CN116020297A (en) * | 2021-10-22 | 2023-04-28 | 中国石油化工股份有限公司 | Mixing device and thick oil viscosity reduction compound flooding water injection well mixing system |
| CN114837618A (en) * | 2022-05-11 | 2022-08-02 | 杜凤修 | Anti-scale water distributor |
| CN217538665U (en) * | 2022-06-08 | 2022-10-04 | 阜新市石油工具厂 | Sand-proof bridge type concentric water distributor |
| CN115110931A (en) * | 2022-07-22 | 2022-09-27 | 中国石油化工股份有限公司 | Characterization method for pressure flooding water injection permeability increasing degree of low-permeability reservoir |
| CN218150885U (en) * | 2022-11-02 | 2022-12-27 | 四川省科学城久利电子有限责任公司 | A adjustable injection mandrel of whole well for injecting polymer |
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| Publication number | Publication date |
|---|---|
| CN116517514A (en) | 2023-08-01 |
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