CN112049595A - Returnable overshot and overshot method - Google Patents
Returnable overshot and overshot method Download PDFInfo
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- CN112049595A CN112049595A CN202011048978.7A CN202011048978A CN112049595A CN 112049595 A CN112049595 A CN 112049595A CN 202011048978 A CN202011048978 A CN 202011048978A CN 112049595 A CN112049595 A CN 112049595A
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- 238000000034 method Methods 0.000 title claims abstract description 26
- 241000251468 Actinopterygii Species 0.000 claims description 28
- 238000005553 drilling Methods 0.000 claims description 13
- 229910000831 Steel Inorganic materials 0.000 claims description 6
- 239000010959 steel Substances 0.000 claims description 6
- 238000006073 displacement reaction Methods 0.000 claims description 3
- 239000004519 grease Substances 0.000 claims description 3
- 230000001050 lubricating effect Effects 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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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
- E21B31/00—Fishing for or freeing objects in boreholes or wells
- E21B31/12—Grappling tools, e.g. tongs or grabs
- E21B31/18—Grappling tools, e.g. tongs or grabs gripping externally, e.g. overshot
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- Engineering & Computer Science (AREA)
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- Mining & Mineral Resources (AREA)
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- Environmental & Geological Engineering (AREA)
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- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
Abstract
The invention belongs to the field of downhole operation tools of oil and gas fields, and particularly relates to a retractable fishing barrel and a fishing method. The utility model provides a can move back formula overshot, is including the top connection and the barrel that connect gradually, top connection and barrel cavity form the inside runner that runs through, the inside runner from last ball seat, dabber, release spring, slip seat, salvage spring and slips of being equipped with down in proper order, the dabber with the slip seat adopts pretension pin joint, the slips with slip seat, dabber pass through stroke pin joint, the center of ball seat, dabber, slip seat inside center forms the central runner that runs through. The invention realizes the salvaging of the drop well pipe column by utilizing the relative movement of the slips and the slip seat inclined plane and tightly biting the outer surface of the drop well pipe column, the slips are pushed to move reversely by adopting a mechanical structure of 'spring + stroke pin', the drop well pipe column is released, the pipe column does not need to be reversed when the drop well pipe column is withdrawn, the operation is simple, and the safety and the reliability are realized.
Description
Technical Field
The invention belongs to the field of downhole operation tools of oil and gas fields, and particularly relates to a retractable fishing barrel and a fishing method.
Background
In the process of exploration and development of oil and gas fields, from drilling, well repairing, oil and gas fracturing testing and production putting, a pipe column is always accompanied by the full life cycle of one well, basically all operation procedures can not be separated from the pipe column, and only few operations can be replaced by cables. The frequent use of the pipe column, together with the reasons of complex geological conditions, immature process, limited skill level of operators and the like on the site, causes the phenomenon that the operation pipe column breaks off the well, if the pipe column falling off the well can not be salvaged, the phenomenon is equal to that the well is directly scrapped, great economic loss is caused, and the loss of petroleum exploration and development is immeasurable.
At present, some common fishing tools, such as a male cone, a female cone, a fishing spear (a retractable fishing spear), a fishing barrel (a retractable fishing barrel) and the like, can realize the fishing of a pipe column falling into a well, but in general situations, the pipe column falling into the well is lifted up after being fished and is blocked, so that the processing is very difficult, and therefore, the tool is very important to be withdrawn from the falling pipe after being blocked. Some existing withdrawable fishing tools also have the function of withdrawing fallen fish, but the principle is realized by the mode of striking the tubular column downwards, reversing and reversing, and due to the influence of factors such as well type, well inclination angle and reversing turns which are difficult to master, especially when the tubular column is fished in the horizontal section of the horizontal well, the condition of withdrawing the fallen fish is very few, especially the reversing operation is often realized at the position which is not reversed, and as a result, the shaft is complex and can not be processed, and the secondary shaft is complex and appears, so that accident superposition accidents are caused.
Disclosure of Invention
In view of the above problems, an object of the present invention is to provide a retractable overshot and a method for fishing the overshot, in which the slip and the slip seat are relatively moved to bite the outer surface of the drop pipe column to realize fishing of the drop pipe column, the original reverse rotation way of exiting the drop pipe column is changed, the function of exiting the fish in the case of catching the fish is realized in a hydraulic way, and the complex enlargement of the underground can be effectively prevented.
The technical scheme of the invention is as follows:
a retractable overshot comprises an upper connector and a barrel body which are sequentially connected, wherein the upper part of the upper connector is connected with an external oil pipe, and the lower part of the barrel body is used for connecting an external fish head; the upper joint and the barrel are hollow to form a through internal flow passage, and the internal flow passage is sequentially provided with a ball seat, a mandrel, a release spring, a slip seat, a fishing spring and a slip from top to bottom; the mandrel is connected with the slip seat by a pre-tightening pin, and a stroke pin groove is formed in the mandrel; the slip seat is fixedly connected with the lower part of the upper joint, and a groove-shaped hole is formed in the slip seat; the slips are provided with stroke pin holes and connected with the slip seat and the mandrel through stroke pins; and a through central flow passage is formed in the ball seat, the mandrel and the slip seat.
The ball seat is in threaded connection with the mandrel, the outer diameter of the ball seat is the same as the inner diameter of the upper joint and larger than the outer diameter of the mandrel, and the release spring is located in an annular space formed by the ball seat, the mandrel, the slip seat and the upper joint.
The slip seat is in threaded connection with the lower portion of the upper joint, the outer diameter of the slip seat is larger than the inner diameter of the upper joint and smaller than the inner diameter of the cylinder, and the fishing spring is located in an annular space formed by the slip seat, the slips, the cylinder and the upper joint.
The width of the slot-shaped hole is the same as the width of the travel pin slot and is equal to the outer diameter of the travel pin hole.
The inner side of the upper part of the ball seat is provided with a 45-degree chamfer.
The slip teeth of the slip are left-handed slip teeth, and the number of the slip is at least 3.
The upper connecting end of the upper joint is in a conventional oil pipe female thread buckle type.
A method for fishing a returnable overshot uses any returnable overshot as described above, and comprises the following specific processes:
the method comprises the following steps: the retractable overshot is installed before entering the well;
the retractable overshot is required to be carefully checked and maintained when being put into a well, lubricating grease is required to be coated on each movable part to ensure flexibility and effectiveness, meanwhile, whether a pre-tightening pin is intact or not is checked, the damaged part is required to be replaced in time, whether a slip is in a salvaging state or not is checked, whether the slip is matched with the outer diameter of a dropping well pipe column or not is checked, and whether a steel ball is matched with a ball seat or not is checked;
step two: the retractable overshot enters the well;
after the retractable overshot is qualified after being checked on the ground, the upper joint is arranged at the foremost end of the overshot pipe column and enters a well, and the drilling speed is strictly controlled to be not more than 0.5m/s in the lowering process;
step three: salvaging a pipe column falling into the well;
the retractable fishing barrel in a fishing state is characterized in that under the elastic force action of a fishing spring, a slip is in contact with an inclined plane of a slip seat and is lowered to about 100 meters away from a fish head, the drilling speed is controlled to be not more than 5m/min, the fish head is slowly lifted for 3-5m after being detected, the hanging weight is recorded, a pump is started to circulate with large displacement, the fish head is washed, then a fishing pipe column is slowly lowered while circulating, the pump pressure and the hanging weight are observed, whether the fish head enters a barrel body and the slip is judged, a fishing pipe column is slowly lifted, the slip and the inclined plane of the slip seat move relatively, the slip bites the outer surface of the dropping pipe column, if the hanging weight is observed to be more than the weight of the fishing pipe column, the dropping fish is fished, and the dropping pipe column is fished;
step four: disassembling the well-falling pipe column after being lifted out;
after the well-falling pipe column is fished out, the well-falling pipe column is lifted out of the ground, redundant pipe columns are cut off, and the connecting threads of the cylinder body, the slip seat and the upper joint are removed, so that the tool can be withdrawn.
In the third step: after the retractable fishing barrel catches the falling well pipe column, if the hanging weight is far greater than the sum of the weights of the fishing pipe column and the falling well pipe column in the process of slowly lifting, the falling well pipe column is judged to be blocked, under the condition that the up-and-down movable drilling tool is still ineffective within the allowable upward pulling force range, the drilling is given up in time to prevent the overload of a derrick lifting system, the fish needs to be withdrawn at the moment, the pipe column is hit downwards, the engaging force between the slips and the outer surface of the pipe column of the falling well is reduced, a steel ball is thrown from the wellhead and is located on a ball seat of the retractable fishing barrel, the pressure in the fishing pipe column is raised, the mandrel is pushed to move downwards, the pre-tightening pin is cut off, the pressure is released, the release spring is compressed firstly and then extended, under the elastic force action of the release spring, the mandrel moves upwards, meanwhile, the stroke pin acts on the slip, the slip is pulled to move upwards along the stroke pin groove, the slip is separated from the inclined plane of the slip seat, and the fishing pipe column is lifted to realize the release of the pipe column falling into the well when encountering the block.
The invention has the technical effects that: 1. the invention realizes the salvaging of the drop well pipe column by utilizing the relative movement of the slip and the slip seat inclined plane and tightly biting the outer surface of the drop well pipe column, has simple structure and convenient operation, and can quickly realize the salvaging of the drop well pipe column. 2. According to the invention, the pre-tightening pin is directly pressed and cut in the fishing barrel after the ball is thrown, the slip is pushed to move reversely by adopting a mechanical structure of a spring and a stroke pin, the well-falling pipe column is released, the pipe column does not need to be reversed when the well-falling pipe column is withdrawn, and the operation is simple, safe and reliable.
The following will be further described with reference to the accompanying drawings.
Drawings
FIG. 1 is a schematic structural diagram of a retractable overshot with a pre-tightening pin not sheared and a slip in a working state of a fishing drop well string.
FIG. 2 is a schematic structural diagram of the working state of the retractable overshot in which a pre-tightening pin is sheared and slips are released to release the well-dropping pipe column.
Reference numerals: 1-upper joint, 2-ball seat, 3-release spring, 4-mandrel, 5-fishing spring, 6-pre-tightening pin, 7-slip seat, 8-stroke pin, 9-slip, 10-cylinder, 11-internal flow channel, 12-groove-shaped hole, 13-stroke pin groove, 14-stroke pin hole and 15-central flow channel.
Detailed Description
Example 1
In order to solve the problem that secondary shaft complication is easily caused due to the fact that an existing retractable fishing tool is influenced by factors such as well type, well inclination angle and difficulty in grasping the number of turns of reversal when a falling fish is withdrawn by means of downward striking of a pipe column, reversal and back-off, the invention provides a retractable fishing barrel and a fishing method as shown in figure 1.
As shown in fig. 1, the retractable overshot comprises an upper connector 1 and a barrel body 10 which are sequentially connected, wherein the upper part of the upper connector 1 is connected with an external oil pipe, and the lower part of the barrel body 10 is used for connecting an external fish head;
the upper joint 1 and the barrel 10 are hollow to form a through internal flow channel 11, and the internal flow channel 11 is sequentially provided with a ball seat 2, a mandrel 4, a release spring 3, a slip seat 7, a fishing spring 5 and a slip 9 from top to bottom;
the mandrel 4 is connected with the slip seat 7 by a pre-tightening pin 6, and a stroke pin groove 13 is formed in the mandrel 4;
the slip seat 7 is fixedly connected with the lower part of the upper joint 1, and a groove-shaped hole 12 is formed in the slip seat 7;
the slip 9 is provided with a stroke pin hole 14, and the slip 9 is connected with the slip seat 7 and the mandrel 4 through a stroke pin 8;
the ball seat 2, the mandrel 4 and the slip seat 7 form a through central flow passage 15 at the inner center.
According to the invention, the fishing spring 5 drives the slip 9 and the slip seat 7 to move relatively to each other, the outer surface of the drop tubular column is tightly bitten to realize the fishing of the drop tubular column, the ball seat 2 is blocked after the ball is thrown, the central flow passage 15 is closed, the upper part of the fishing barrel is suppressed and the pre-tightening pin 6 is cut off, the release spring 3 drives the mandrel 4 and the stroke pin 8 to push the slip 9 to move reversely, the drop tubular column is released, the drop tubular column does not need to be reversed when being withdrawn, and the operation is simple, safe and reliable.
Example 2
Preferably, on the basis of embodiment 1, in this embodiment, preferably, the ball seat 2 is in threaded connection with the mandrel 4, the outer diameter of the ball seat 2 is the same as the inner diameter of the upper joint 1 and is larger than the outer diameter of the mandrel 4, and the release spring 3 is located in an annular space formed by the ball seat 2, the mandrel 4, the slip seat 7 and the upper joint 1.
In practical use, the release spring 3 is vertically limited by the ball seat 2 and the slip seat 7 respectively, and when the pre-tightening pin 6 is sheared off, the spring 3 is compressed and extended to drive the ball seat 2 to move up and down, so that the slips 9 are driven to move reversely to release the well-falling pipe column.
Preferably, the slip seat is in threaded connection with the lower part of the upper joint, the outer diameter of the slip seat 7 is larger than the inner diameter of the upper joint 1 and smaller than the inner diameter of the cylinder 10, and the fishing spring 5 is located in an annular space formed by the slip seat 7, the slips 9, the cylinder 10 and the upper joint 1.
In actual use, salvage spring 5 is spacing from top to bottom by top connection 1, slips 9 respectively, and when slips 9 contact fish top, salvage spring 5 compression can drive slips 9 upward movement to realize slips 9 and 7 inclined planes's relative movement, bite the surface realization well tubular column that falls of slip seat and salvage.
Preferably, the width of the slot-type hole 12 is the same as the width of the travel pin slot 13, and is equal to the outer diameter of the travel pin hole 14. The inner side of the upper part of the ball seat 2 is provided with a 45-degree chamfer.
In actual use, after the ball is thrown, the ball is tightly combined with the ball seat 2 to block the central flow passage 15, so that the upper part of the overshot is guaranteed to be suppressed and the pre-tightening pin 6 is cut off.
Preferably, the slip teeth of the slips 9 are left-handed slip teeth, and the number of the slip is at least 3.
In actual use, the slip teeth of the slip 9 are left-handed slip teeth, so that the back-off operation can be realized when the tool cannot withdraw from the fish falling under special conditions, and the slip is good in universality and strong in applicability.
Preferably, the upper connection end of the upper joint 1 is of a conventional tubing box thread button type. Due to the use of the conventional thread buckle type, the invention can be conveniently connected to a working string without using a special adapter.
Example 3
On the basis of the embodiment 2, the method for fishing the returnable overshot uses any returnable overshot as described above, and comprises the following specific processes:
the method comprises the following steps: installing the retractable overshot before entering the well;
the retractable overshot is required to be seriously checked and maintained when being put into a well, lubricating grease is required to be coated on each movable part to ensure flexibility and effectiveness, meanwhile, whether the pre-tightening pin 6 is intact or not is checked, the damaged part is required to be replaced in time, whether the slips 9 are in a salvaging state or not and are matched with the outer diameter of a dropping well pipe column or not is checked, and whether the steel ball is matched with the ball seat 2 or not is checked;
step two: the retractable overshot enters the well;
after the retractable overshot is qualified after being checked on the ground, the upper joint 1 is installed at the foremost end of the fishing pipe column and enters a well, and the drilling speed is strictly controlled to be not more than 0.5m/s in the lowering process;
step three: salvaging a pipe column falling into the well;
the retractable fishing barrel in a fishing state is characterized in that under the elastic force action of a fishing spring 5, a slip 9 is in contact with an inclined plane of a slip seat 7 and is lowered to about 100 meters away from a fish head, the drilling speed is controlled to be not more than 5m/min, the fish head is slowly detected and then lifted for 3-5m, the hanging weight is recorded, pump large displacement circulation is started, the fish head is washed, then a fishing pipe column is slowly lowered while circulating, the pump pressure and the hanging weight are observed, whether the fish head enters a barrel body 10 and the slip 9 or not is judged, the fishing pipe column is slowly lifted, the slip 9 and the inclined plane of the slip seat 7 relatively move, the slip 9 bites the outer surface of a dropping pipe column, if the hanging weight is observed to be more than the weight of the fishing pipe column, the dropping fish is fished, and the dropping pipe column is fished by;
step four: disassembling the well-falling pipe column after being lifted out;
after the well-falling pipe column is fished out, the well-falling pipe column is lifted out of the ground, redundant pipe columns are cut off, the connecting threads of the cylinder body 10, the slip seat 7 and the upper joint 1 are removed, and the tool can be withdrawn.
In the third step: after the retractable fishing barrel catches the falling tubular column, if the hanging weight is far greater than the sum of the weights of the fishing tubular column and the falling tubular column in the slow lifting process, the falling tubular column is judged to be blocked, under the condition that the up-and-down movable drilling tool is still ineffective within the allowable lifting tension range, the drilling is given up in time to prevent the overload of a derrick lifting system, at the moment, the falling fish needs to be withdrawn, the tubular column is knocked down, the gripping force of a slip 9 and the outer surface of the falling tubular column is reduced, a steel ball is thrown from a wellhead and is seated on a ball seat 2 of the retractable fishing barrel, as shown in figure 2, the pressure in the fishing tubular column is knocked down to push a mandrel 4 to move down, a pre-tightening pin 6 is sheared, the pressure is released, a release spring 3 is compressed and then extended, under the elastic force of the release spring 3, the mandrel 4 moves up, meanwhile, a stroke pin 8 acts on the slip 9 to pull a stroke pin groove 13 to move up, and the, the fishing pipe column is lifted to release the pipe column falling into the well when the pipe column is blocked.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention.
Claims (9)
1. The retractable overshot comprises an upper connector (1) and a barrel body (10) which are sequentially connected, wherein the upper part of the upper connector (1) is connected with an external oil pipe, and the lower part of the barrel body (10) is used for connecting an external fish head; the method is characterized in that: the upper connector (1) and the barrel (10) are hollow to form a through internal flow channel (11), and the internal flow channel (11) is sequentially provided with a ball seat (2), a mandrel (4), a release spring (3), a slip seat (7), a fishing spring (5) and a slip (9) from top to bottom;
the mandrel (4) is connected with the slip seat (7) by a pre-tightening pin (6), and a stroke pin groove (13) is formed in the mandrel (4);
the slip seat (7) is fixedly connected with the lower part of the upper joint (1), and a groove-shaped hole (12) is formed in the slip seat (7);
the slip (9) is provided with a stroke pin hole (14), and the slip (9) is connected with the slip seat (7) and the mandrel (4) through a stroke pin (8);
and a central flow passage (15) which penetrates through the ball seat (2), the mandrel (4) and the slip seat (7) is formed in the center inside.
2. A retractable overshot according to claim 1, characterised in that: ball seat (2) and dabber (4) adopt threaded connection, the external diameter of ball seat (2) with top connection (1) internal diameter is the same, and is greater than the external diameter of dabber (4), release spring (3) are located in the annular space that ball seat (2), dabber (4), slip seat (7) and top connection (1) formed.
3. A retractable overshot according to claim 1, characterised in that: the anchor ring is characterized in that the slip seat (7) is in threaded connection with the lower portion of the upper joint (1), the outer diameter of the slip seat (7) is larger than the inner diameter of the upper joint (1) and smaller than the inner diameter of the cylinder body (10), and the fishing spring (5) is located in an annular space formed by the slip seat (7), the slips (9), the cylinder body (10) and the upper joint (1).
4. A retractable overshot according to claim 1, characterised in that: the width of the groove-shaped hole (12) is the same as that of the stroke pin groove (13) and is equal to the outer diameter of the stroke pin hole (14).
5. A retractable overshot according to claim 1, characterised in that: the inner side of the upper part of the ball seat (2) is provided with a 45-degree chamfer.
6. A retractable overshot according to claim 1, characterised in that: the slip teeth of the slip (9) are left-handed slip teeth, and the number of the slip is at least 3.
7. A retractable overshot according to claim 1, characterised in that: the upper connecting end of the upper joint (1) is of a conventional oil pipe female thread buckle type.
8. A method of fishing a retractable overshot according to any one of claims 1-7, characterised in that: the method comprises the following steps:
the method comprises the following steps: the retractable overshot is installed before entering the well;
the retractable overshot is required to be seriously checked and maintained when being put into a well, lubricating grease is required to be coated on each movable part to ensure flexibility and effectiveness, meanwhile, whether the pre-tightening pin (6) is intact or not is checked, the damaged part is required to be replaced in time, whether the slips (9) are in a salvaging state or not and are matched with the outer diameter of a dropping well pipe column or not is checked, and whether the steel ball is matched with the ball seat (2) or not is checked;
step two: the retractable overshot enters the well;
after the retractable overshot is qualified after being checked on the ground, the upper joint (1) is installed at the foremost end of the overshot pipe column and enters a well, and the drilling speed is strictly controlled to be not more than 0.5m/s in the lowering process;
step three: salvaging a pipe column falling into the well;
under the elastic force action of a fishing spring (5), a slip (9) is in contact with the inclined plane of a slip seat (7) and is lowered to about 100 meters away from a fish head, the drilling speed is controlled to be not more than 5m/min, the fish head is slowly detected and then lifted for 3-5m, the hanging weight is recorded, a pump is started for large displacement circulation, the fish head is washed, then a fishing pipe column is slowly lowered while circulating, the pump pressure and the hanging weight are observed, whether the fish head enters a barrel body (10) and the slip (9) is judged, the fishing pipe column is slowly lifted, the slip (9) and the inclined plane of the slip seat (7) move relatively, the slip (9) bites the outer surface of the falling pipe column, if the hanging weight is observed to be more than the weight of the fishing pipe column, the falling fish is fished, and the falling pipe column is fished by a drill;
step four: disassembling the well-falling pipe column after being lifted out;
after the well-falling pipe column is fished out, the well-falling pipe column is lifted out of the ground, redundant pipe columns are cut off, and the connecting threads of the cylinder body (10), the slip seat (7) and the upper joint (1) are disassembled, so that the tool can be withdrawn.
9. The method of using a retractable overshot according to claim 8, characterised in that: in the third step, after the retractable fishing barrel catches the falling tubular column, if the hanging weight is far greater than the sum of the weight of the fishing tubular column and the weight of the falling tubular column in the slow lifting process, the falling tubular column is judged to be blocked, under the condition that the up-and-down movable drilling tool is still ineffective within the allowable lifting tension range, the drilling needs to be given up in time to prevent the overload of a derrick lifting system, the falling fish needs to be withdrawn at the moment, the tubular column is hit downwards, the gripping force between a slip (9) and the outer surface of the falling tubular column is reduced, a steel ball is thrown from the wellhead and sits on a ball seat (2) of the retractable fishing barrel, the pressure in the fishing tubular column pushes a mandrel (4) to move downwards, a pre-tightening pin (6) is cut, the pressure is released, a release spring (3) is compressed and then extended, the mandrel (4) moves upwards under the elastic force of the release spring (3), meanwhile, the slip (9) acts on the slip (9) through a stroke pin (8), and pulls the stroke pin, the slips (9) are separated from the inclined plane of the slip seat (7), and the fishing pipe column is lifted to release the pipe column falling into the well when the slips fall into the well.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011048978.7A CN112049595A (en) | 2020-09-29 | 2020-09-29 | Returnable overshot and overshot method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011048978.7A CN112049595A (en) | 2020-09-29 | 2020-09-29 | Returnable overshot and overshot method |
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| CN112049595A true CN112049595A (en) | 2020-12-08 |
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| CN202011048978.7A Pending CN112049595A (en) | 2020-09-29 | 2020-09-29 | Returnable overshot and overshot method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116066004A (en) * | 2022-06-10 | 2023-05-05 | 中国石油天然气集团有限公司 | Fishing device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116066004A (en) * | 2022-06-10 | 2023-05-05 | 中国石油天然气集团有限公司 | Fishing device |
| CN116066004B (en) * | 2022-06-10 | 2024-01-26 | 中国石油天然气集团有限公司 | Fishing device |
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