CN111287687A - Intelligent electric water plugging tool for oil well - Google Patents
Intelligent electric water plugging tool for oil well Download PDFInfo
- Publication number
- CN111287687A CN111287687A CN202010233133.9A CN202010233133A CN111287687A CN 111287687 A CN111287687 A CN 111287687A CN 202010233133 A CN202010233133 A CN 202010233133A CN 111287687 A CN111287687 A CN 111287687A
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- Prior art keywords
- ring
- block
- limiting
- pipe
- packer body
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- 239000003129 oil well Substances 0.000 title claims abstract description 35
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 21
- 239000007788 liquid Substances 0.000 claims abstract description 21
- 238000012545 processing Methods 0.000 claims description 24
- 230000009471 action Effects 0.000 claims description 11
- 238000004891 communication Methods 0.000 claims description 9
- 229910001220 stainless steel Inorganic materials 0.000 claims description 3
- 239000010935 stainless steel Substances 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 29
- 238000007789 sealing Methods 0.000 description 28
- 230000008859 change Effects 0.000 description 5
- 230000007246 mechanism Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 238000012856 packing Methods 0.000 description 4
- 238000011161 development Methods 0.000 description 3
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 238000004880 explosion Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000004873 anchoring Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009530 blood pressure measurement Methods 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 235000020681 well water Nutrition 0.000 description 1
Images
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
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/12—Packers; Plugs
- E21B33/122—Multiple string packers
-
- 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
- E21B47/00—Survey of boreholes or wells
- E21B47/06—Measuring temperature or pressure
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)
- Geophysics (AREA)
- Pipe Accessories (AREA)
Abstract
An intelligent electric water plugging tool for an oil well comprises a first central pipe, a connecting ring, a connecting pipe, a second central pipe, a first packer body, a limiting ring, a connecting block, a limiting block, a threaded rod, a connecting rod, a one-way valve, a second packer body, a control box and a pressure sensor; the connecting ring is communicated with the liquid outlet end of the first central pipe; the liquid inlet end of the connecting pipe is communicated with the connecting ring; the liquid outlet end of the connecting pipe is connected with the liquid outlet end of the second central pipe; the first packer body is arranged on the outer periphery of the second central pipe; the limiting ring is arranged on the periphery of the first central pipe; a limiting groove is arranged inside the connecting ring; the limiting block is arranged inside the limiting groove in a sliding manner; the end surface of the connecting block facing the vertical central axis of the connecting ring is connected with the limiting block; a threaded hole is formed in the limiting block; the upper end of the threaded rod passes through the threaded hole in a spiral way; the lower end of the threaded rod is far away from the connecting block; the connecting rod is located the below of threaded rod. This electronic water shutoff instrument of intelligent oil well has the effect that reduces damage and real-time supervision.
Description
Technical Field
The invention relates to the field, in particular to an intelligent electric water plugging tool for an oil well.
Background
The oil well is a hole drilled according to a well arrangement system planned by oil field development, the oil rises from the bottom of the well to a channel of a well head, the oil well is a hole drilled by a well drilling method, after the oil layer is drilled, an oil layer casing is put into the oil layer casing, oil well cement is injected into an annular space between the casing and the well wall to maintain the well wall and seal oil, gas and water layers, then the oil layer is jetted by a perforating gun according to the requirements of the oil field development to form the channel, an oil pipe is put into the channel, the oil rises from the bottom of the oil well to the well head by a proper induced flow method, and a packer is used as an important tool in the oil field development to play a role of plugging the well hole.
The packer of current publication No. CN203808922U for solve current packer and seal the problem that sealed effect is not good when packing off minor diameter well, this utility model includes the center tube and locate actuating mechanism, anchoring mechanism, seat that the center tube is outside, unseal mechanism, sealing mechanism, wherein, actuating mechanism includes one-level liquid cylinder lid, one-level hydraulic cylinder, one-level piston, second grade hydraulic cylinder, second grade piston, tertiary hydraulic cylinder, tertiary piston. The utility model discloses a design tertiary hydraulic cylinder structure, improved the effort of packer hydraulic cylinder compression packing element when setting, and then can have good sealed effect when sealing off the minor diameter well.
Although having among the above-mentioned technical scheme and having improved the effort of packer hydraulic cylinder compression packing element when setting, and then can have good sealed effect when packing off the minor diameter well, still having the in-process of using, the packer is because of the extrusion of the continuous wriggling of defeated oil pipe, easily causes the damage of plugging device and pipeline, simultaneously because of not having the pressure measurement subassembly, can't accurately master shutoff department pressure, easily causes the oil well because of the too high blowout of pressure.
In order to solve the problem, the application provides an intelligent electric water plugging tool for an oil well.
Disclosure of Invention
Objects of the invention
In order to solve the technical problems in the background art, the invention provides an intelligent electric water shutoff tool for an oil well, wherein a limiting block rotates along a limiting groove, so that the rotation force and the wriggling generated by a first central pipe are offset and rotated; under the effect of control box, carry out real-time supervision to the pressure of department in the oil well, avoid oil to erupt because of the pressure is too big.
(II) technical scheme
In order to solve the problems, the invention provides an intelligent electric water shutoff tool for an oil well, which comprises a first central pipe, a connecting ring, a connecting pipe, a second central pipe, a first packer body, a limiting ring, a connecting block, a limiting block, a threaded rod, a connecting rod, a one-way valve, a second packer body, a control box and a pressure sensor, wherein the connecting ring is arranged on the first central pipe;
the connecting ring is communicated with the liquid outlet end of the first central pipe; the liquid inlet end of the connecting pipe is communicated with the connecting ring; the liquid outlet end of the connecting pipe is connected with the liquid outlet end of the second central pipe; the first packer body is arranged on the outer periphery of the second central pipe; the limiting ring is arranged on the periphery of the first central pipe; a limiting groove is arranged inside the connecting ring; the limiting block is arranged inside the limiting groove in a sliding manner; the end surface of the connecting block facing the vertical central axis of the connecting ring is connected with the limiting block;
a threaded hole is formed in the limiting block; the upper end of the threaded rod passes through the threaded hole in a spiral way; the lower end of the threaded rod is far away from the connecting block; the connecting rod is positioned below the threaded rod; the upper end of the connecting rod is connected with the threaded rod; the lower end of the connecting rod extends into the limiting ring and is rotationally connected with the limiting ring;
the second packer body is arranged on the outer periphery of the first central pipe; the one-way valve is arranged on the first central pipe; the pressure sensor is arranged at the lower end of the second packer body;
the control box comprises a central processing unit and a display operation module; the control box is positioned in the operating room; the input end of the central processing unit is respectively in communication connection with the output ends of the first packer body and the second packer body and is used for controlling the opening and closing of the first packer body and the second packer body; the input end of the central processing unit is in communication connection with the output end of the pressure sensor and is used for processing a signal A transmitted by the pressure sensor; the display operation module is in communication connection with the central processing unit and is used for receiving and displaying a signal A sent by the central processing unit; the display operation module is used for sending an action instruction to the central processing unit and controlling the actions of the first packer body and the second packer body.
Preferably, a placing groove is formed in the limiting ring; the placing groove forms a placing opening at the top of the limiting ring; a baffle ring is arranged at the inner periphery of the placing opening; the lower end of the connecting rod penetrates through the through hole of the limiting ring and is rotationally connected with the limiting ring; the lower end of the connecting rod is provided with a stop block; the periphery of dog is rotated with the inner wall of standing groove and is connected.
Preferably, the periphery of threaded rod sets up the turning block, and the turning block is located the below of connecting block.
Preferably, the diameter value of the stop block is smaller than that of the stop ring, and the outer surface of the stop block is smooth.
Preferably, the connecting pipe is selected as a telescopic pipe; the diameter value of the connecting pipe is equal to the diameter value of the first central pipe.
Preferably, the threaded rods are arranged in two side by side and are selected from stainless steel threaded rods.
Preferably, the one-way valve is selected as a one-way liquid inlet valve.
The technical scheme of the invention has the following beneficial technical effects:
under the effect of the display operation module, the effects of operation, control and observation are achieved, the display operation module sends an instruction to the central processing unit through operation of the display operation module, the central processing unit sends an action instruction to the first sealing isolator and the second sealing isolator respectively so as to drive or close the first sealing isolator and the second sealing isolator, and therefore the effects of electric drive and convenience in control and operation are achieved, under the effect of the pressure sensor, the pressure value in the oil well is monitored in real time, and the effects of explosion and eruption caused by overhigh pressure are avoided; the first sealing isolator and the second sealing isolator are started to achieve the sealing effect on the oil well, and the first sealing isolator and the second sealing isolator are arranged at the same time to perform double sealing on the oil well, so that the leakage phenomenon caused by the traditional single sealing is avoided, the double stable sealing is achieved, and the sealing effect of the oil well is further improved; when the first central tube creeps, component force generated by creeping drives the limiting ring to rotate, and the rotation of the limiting ring drives the limiting block to move in the limiting groove, so that force generated by creeping of the first central tube is buffered, the effect of protecting the first central tube is achieved, and damage is reduced; through rotatory threaded rod, separate with the connecting block to reached and be convenient for separate threaded rod and connecting block, pull down the change with first center tube, thereby reached the effect of being convenient for change.
Drawings
Fig. 1 is a schematic structural diagram of an intelligent electric water shutoff tool for an oil well according to the present invention.
Fig. 2 is a schematic partial structure diagram of an intelligent electric water shutoff tool for an oil well according to the present invention.
Fig. 3 is a schematic system structure diagram of an intelligent electric oil well water plugging tool provided by the invention.
Fig. 4 is a schematic structural diagram of a connection ring in an intelligent electric water shutoff tool for an oil well according to the present invention.
Fig. 5 is a schematic top view of a limiting ring in the intelligent electric water shutoff tool for an oil well according to the present invention.
Reference numerals:
1. a first center tube; 2. a connecting ring; 3. a connecting pipe; 4. a second center tube; 5. a first packer body; 6. a limiting ring; 7. connecting blocks; 8. a limiting block; 9. a threaded rod; 10. a connecting rod; 11. a one-way valve; 12. a second packer body; 13. a limiting groove; 14. a control box; 15. a pressure sensor; 16. a central processing unit; 17. a display operation module; 18. a placement groove; 19. a baffle ring; 20. a stopper; 21. and (6) rotating the block.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings in conjunction with the following detailed description. It should be understood that the description is intended to be exemplary only, and is not intended to limit the scope of the present invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention.
As shown in fig. 1-5, the intelligent electric water shutoff tool for the oil well provided by the invention comprises a first central tube 1, a connecting ring 2, a connecting tube 3, a second central tube 4, a first packer body 5, a limiting ring 6, a connecting block 7, a limiting block 8, a threaded rod 9, a connecting rod 10, a one-way valve 11, a second packer body 12, a control box 14 and a pressure sensor 15;
the connecting ring 2 is communicated with the liquid outlet end of the first central tube 1; the liquid inlet end of the connecting pipe 3 is communicated with the connecting ring 2; the liquid outlet end of the connecting pipe 3 is connected with the liquid outlet end of the second central pipe 4; the first packer body 5 is disposed on the outer periphery of the second base pipe 4; the limiting ring 6 is arranged on the periphery of the first central tube 1; a limiting groove 13 is arranged inside the connecting ring 2; the limiting block 8 is arranged inside the limiting groove 13 in a sliding manner; the end face of the connecting block 7 facing to the vertical central axis of the connecting ring 2 is connected with the limiting block 8;
a threaded hole is formed in the limiting block 8; the upper end of the threaded rod 9 passes through the threaded hole in a spiral way; the lower end of the threaded rod 9 is far away from the connecting block 7; the connecting rod 10 is positioned below the threaded rod 9; the upper end of the connecting rod 10 is connected with the threaded rod 9; the lower end of the connecting rod 10 extends into the limiting ring 6 and is rotatably connected with the limiting ring 6;
the second packer body 12 is disposed on the outer periphery of the first base pipe 1; the one-way valve 11 is arranged on the first central tube 1; the pressure sensor 15 is arranged at the lower end of the second packer body 12;
the control box 13 comprises a central processor 16 and a display operation module 17 inside; the control box 13 is positioned in the operation chamber; the input end of the central processor 16 is respectively in communication connection with the output ends of the first packer body 5 and the second packer body 12 and is used for controlling the opening and closing of the first packer body 5 and the second packer body 12; the input end of the central processing unit 16 is in communication connection with the output end of the pressure sensor 15 and is used for processing a signal A transmitted by the pressure sensor 15; the display operation module 17 is in communication connection with the central processing unit 16 and is used for receiving and displaying the signal A sent by the central processing unit 16; the display operation module 17 is used for sending an action instruction to the central processing unit 16 and controlling the actions of the first packer body 5 and the second packer body 12.
In the invention, under the action of the display operation module 17, the effects of operation, control and observation are achieved, the display operation module 17 sends an instruction to the central processing unit 16 through operating the display operation module 17, the central processing unit 16 respectively sends an action instruction to the first sealing isolator 5 and the second sealing isolator 12 to drive or close the first sealing isolator 5 and the second sealing isolator 12, so that the effects of electric drive and convenience for control and operation are achieved, under the action of the pressure sensor 15, the pressure value in the oil well is monitored in real time, and the effects of explosion and eruption caused by overhigh pressure are avoided; the first sealing isolator 5 and the second sealing isolator 12 are started to achieve the sealing effect on the oil well, and the first sealing isolator 5 and the second sealing isolator 12 are arranged at the same time to perform double sealing on the oil well, so that the leakage phenomenon caused by the traditional single sealing is avoided, the double stable sealing is achieved, and the sealing effect of the oil well is further improved; when the first central tube 1 wriggles, the component force generated by wriggling drives the limiting ring 16 to rotate, the rotation of the limiting ring 16 drives the limiting block 8 to move in the limiting groove 13, and further the force generated by wriggling of the first central tube 1 is buffered, so that the effect of protecting the first central tube 1 is achieved, and the damage is reduced; through rotatory threaded rod 9, separate with connecting block 7 to reached and be convenient for separate threaded rod 9 and connecting block 7, pull down first center tube 1 and change, thereby reached the effect of being convenient for to change.
In an alternative embodiment, the stop collar 6 is provided with a placement groove 18 on the inside; the placing groove 18 forms a placing opening at the top of the limiting ring 6; a baffle ring 19 is arranged at the inner periphery of the placing opening; the lower end of the connecting rod 10 passes through the through hole of the limiting ring 6 and is rotationally connected with the limiting ring 6; the lower end of the connecting rod 10 is provided with a stop block 20; the periphery of dog 20 is rotated with the inner wall of standing groove 18 and is connected, under the effect of fender ring 19, the effect of blockking has been played to dog 20's rotation, under the effect of dog 20, spacing effect has been played to the rotation of connecting rod 10, make connecting rod 10 rotatory drive threaded rod 9 constantly move down when rotatory, and then drive first center tube 1 and go-between 2 separation, the effect of stably connecting go-between 2 and first center tube 1 has been reached on the one hand, on the other hand has reached the effect convenient to detach and separate, and then be convenient for change and connect first center tube 1.
In an alternative embodiment, a turning block 21 is arranged on the periphery of the threaded rod 9, and the turning block 21 is located below the connecting block 7, so that under the action of the turning block 21, the threaded rod 9 is driven to rotate by turning the turning block 21, and the effect of facilitating the rotation of the threaded rod 9 is achieved.
In an alternative embodiment, the diameter of the stop 20 has a value smaller than that of the stop ring 19, and the outer surface of the stop 20 is smooth, so that the stop 20 facilitates rotation inside the standing groove 18.
In an alternative embodiment, the connecting tube 3 is selected as a telescopic tube; the diameter value of the connecting pipe 3 is equal to that of the first central pipe 1, so that the flux of the connecting pipe 3 is equal to that of the first central pipe 1, and further, the petroleum is stably transmitted.
In an alternative embodiment, two threaded rods 9 are arranged side by side, and the threaded rods 9 are selected to be stainless steel threaded rods, so that the threaded rods 9 can be used for a long time, and further, the damage of the use is reduced.
In an alternative embodiment, the non-return valve 11 is chosen as a non-return valve, so that the liquid is not returned after entering the first central tube 1, and the liquid is stably pumped.
It is to be understood that the above-described embodiments of the present invention are merely illustrative of or explaining the principles of the invention and are not to be construed as limiting the invention. Therefore, any modification, equivalent replacement, improvement and the like made without departing from the spirit and scope of the present invention should be included in the protection scope of the present invention. Further, it is intended that the appended claims cover all such variations and modifications as fall within the scope and boundaries of the appended claims or the equivalents of such scope and boundaries.
Claims (7)
1. An intelligent electric water shutoff tool for an oil well is characterized by comprising a first central tube (1), a connecting ring (2), a connecting tube (3), a second central tube (4), a first packer body (5), a limiting ring (6), a connecting block (7), a limiting block (8), a threaded rod (9), a connecting rod (10), a one-way valve (11), a second packer body (12), a control box (14) and a pressure sensor (15);
the connecting ring (2) is communicated with the liquid outlet end of the first central tube (1); the liquid inlet end of the connecting pipe (3) is communicated with the connecting ring (2); the liquid outlet end of the connecting pipe (3) is connected with the liquid outlet end of the second central pipe (4); the first packer body (5) is arranged on the outer periphery of the second central pipe (4); the limiting ring (6) is arranged on the periphery of the first central pipe (1); a limiting groove (13) is arranged in the connecting ring (2); the limiting block (8) is arranged inside the limiting groove (13) in a sliding manner; the end face of the connecting block (7) facing to the vertical central axis of the connecting ring (2) is connected with the limiting block (8);
a threaded hole is formed in the limiting block (8); the upper end of the threaded rod (9) passes through the threaded hole in a spiral way; the lower end of the threaded rod (9) is far away from the connecting block (7); the connecting rod (10) is positioned below the threaded rod (9); the upper end of the connecting rod (10) is connected with the threaded rod (9); the lower end of the connecting rod (10) extends into the limiting ring (6) and is rotationally connected with the limiting ring (6);
the second packer body (12) is arranged on the periphery of the first central pipe (1); the one-way valve (11) is arranged on the first central pipe (1); the pressure sensor (15) is arranged at the lower end of the second packer body (12);
the control box (13) comprises a central processing unit (16) and a display operation module (17); the control box (13) is positioned in the operation chamber; the input end of the central processing unit (16) is respectively in communication connection with the output ends of the first packer body (5) and the second packer body (12) and is used for controlling the opening and closing of the first packer body (5) and the second packer body (12); the input end of the central processing unit (16) is in communication connection with the output end of the pressure sensor (15) and is used for processing a signal A transmitted by the pressure sensor (15); the display operation module (17) is in communication connection with the central processing unit (16) and is used for receiving and displaying the signal A sent by the central processing unit (16); the display operation module (17) is used for sending an action instruction to the central processing unit (16) and controlling the actions of the first packer body (5) and the second packer body (12).
2. An intelligent electric water shutoff tool for an oil well according to claim 1, characterized in that a placement groove (18) is arranged in the limiting ring (6); the placing groove (18) forms a placing opening at the top of the limiting ring (6); a baffle ring (19) is arranged at the inner periphery of the placing opening; the lower end of the connecting rod (10) penetrates through the through hole of the limiting ring (6) and is rotationally connected with the limiting ring (6); a stop block (20) is arranged at the lower end of the connecting rod (10); the periphery of the stop block (20) is rotationally connected with the inner wall of the placing groove (18).
3. An intelligent electric water shutoff tool for an oil well, according to claim 1, characterized in that a turning block (21) is arranged on the periphery of the threaded rod (9), and the turning block (21) is located below the connecting block (7).
4. An intelligent oil well electric water shutoff tool according to claim 2, characterized in that the diameter value of the stop block (20) is smaller than that of the stop ring (19), and the outer surface of the stop block (20) is smooth.
5. An intelligent electric water shutoff tool for an oil well according to claim 1, characterized in that the connecting pipe (3) is selected as a telescopic pipe; the diameter value of the connecting pipe (3) is equal to that of the first central pipe (1).
6. An intelligent electric water shutoff tool for an oil well, as claimed in claim 1, wherein two threaded rods (9) are arranged side by side, and the threaded rods (9) are selected from stainless steel threaded rods.
7. An intelligent oil well electric water shutoff tool according to claim 1, characterized in that the one-way valve (11) is selected as a one-way liquid inlet valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010233133.9A CN111287687A (en) | 2020-03-29 | 2020-03-29 | Intelligent electric water plugging tool for oil well |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010233133.9A CN111287687A (en) | 2020-03-29 | 2020-03-29 | Intelligent electric water plugging tool for oil well |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111287687A true CN111287687A (en) | 2020-06-16 |
Family
ID=71029639
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010233133.9A Withdrawn CN111287687A (en) | 2020-03-29 | 2020-03-29 | Intelligent electric water plugging tool for oil well |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111287687A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113027375A (en) * | 2021-03-11 | 2021-06-25 | 大庆市天德忠石油科技有限公司 | Combined tool matched with oilfield water plugging process |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110219614A (en) * | 2019-05-29 | 2019-09-10 | 大庆华油石油科技开发有限公司 | A kind of electronic water clogging tool of oil well |
-
2020
- 2020-03-29 CN CN202010233133.9A patent/CN111287687A/en not_active Withdrawn
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110219614A (en) * | 2019-05-29 | 2019-09-10 | 大庆华油石油科技开发有限公司 | A kind of electronic water clogging tool of oil well |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113027375A (en) * | 2021-03-11 | 2021-06-25 | 大庆市天德忠石油科技有限公司 | Combined tool matched with oilfield water plugging process |
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Application publication date: 20200616 |