CN215292413U - Device is collected with junk in oil borehole operation overhaul - Google Patents
Device is collected with junk in oil borehole operation overhaul Download PDFInfo
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- CN215292413U CN215292413U CN202122014137.0U CN202122014137U CN215292413U CN 215292413 U CN215292413 U CN 215292413U CN 202122014137 U CN202122014137 U CN 202122014137U CN 215292413 U CN215292413 U CN 215292413U
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Abstract
The utility model discloses a petroleum borehole operation overhaul is with junk collection device, including salvaging the pipe, the inboard of salvaging the pipe is established to squarely, the top fixedly connected with arc connecting rod of salvaging the pipe, salvaging intraductal slip cap and being equipped with and removing the seat, and remove the bottom fixedly connected with connecting seat of seat, the bottom fixedly connected with electro-magnet of connecting seat, fixed mounting has electric telescopic handle on the left side inner wall of salvaging the pipe, and electric telescopic handle stretch out the end and remove the top fixed connection of seat, salvage on the left side inner wall of pipe fixed mounting have with electric telescopic handle and electro-magnet electric connection's battery. The utility model discloses the mode of being convenient for inhale through magnetism is salvaged the collection to the little ironware junk that falls into in the well, and is convenient for shelter from the shutoff to the bottom fast after salvaging, effectively avoids taking place the phenomenon that little ironware junk dropped once more when upwards shifting out, improves and salvages collection stability, and is convenient for take out the little ironware of salvaging fast after shifting out, satisfies the user demand.
Description
Technical Field
The utility model relates to an oil well junk collecting device technical field especially relates to a device is collected with junk to oil borehole operation overhaul.
Background
The underground operation is a technical means for ensuring normal production of an oil-water well in the process of exploration and development of an oil field, a method for processing fallen objects in the process of underground operation overhaul adopts different salvaging and collecting devices according to different fallen objects, and salvages larger fallen objects by adopting a salvaging barrel and a salvaging spear; in the process of oil downhole operation, small objects can fall down, and for small granular metals with small size (such as metal clips, perforation fragments, screws, pins and the like), a strong magnetic salvage device is generally adopted for salvage, and a magnetic salvage and collection device is a tool for salvaging small iron falling objects by utilizing the magnetic attraction of a magnet and is mainly used for salvaging the small iron falling objects falling into the well.
The method is used for salvaging small iron falling objects (such as metal clips, perforation fragments, screws, pins and the like); present magnetism is salvaged and is collected device, it has to salvage the back and is not convenient for carry out the shortcoming of sheltering from the shutoff fast to the bottom for cause little junk to fall into the oil well once more easily because of vibrations or with factors such as wall of a well collision when upwards shifting out, stability is lower, reduces and salvages efficiency, can not satisfy the user demand, for this reason we have proposed a oil borehole operation overhaul and have collected the device with junk, be used for solving above-mentioned problem.
SUMMERY OF THE UTILITY MODEL
The utility model aims at solving the defects existing in the prior art and providing a junk collecting device for overhauling the petroleum underground operation.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a junk collecting device for overhauling of petroleum underground operation comprises a fishing pipe, wherein the inner side of the fishing pipe is square, the top end of the fishing pipe is fixedly connected with an arc-shaped connecting rod, a moving seat is sleeved in the fishing pipe in a sliding mode, the bottom of the moving seat is fixedly connected with a connecting seat, the bottom of the connecting seat is fixedly connected with an electromagnet, an electric telescopic rod is fixedly installed on the inner wall of the left side of the fishing pipe, the extending end of the electric telescopic rod is fixedly connected with the top of the moving seat, and a storage battery electrically connected with the electric telescopic rod and the electromagnet is fixedly installed on the inner wall of the left side of the fishing pipe;
two first gears are rotatably arranged between the front inner wall and the rear inner wall of the salvaging pipe, the bottom of each first gear is fixedly connected with a baffle plate, the two baffle plates are both positioned below the movable seat, the fishing pipe is internally sleeved with a clip rod in a sliding way, the clip rod is sleeved on the electric telescopic rod, the inner walls of the two sides of the fishing pipe are respectively provided with a rectangular groove, the two sides of the clip rod are respectively and fixedly connected with a rotary driving mechanism, the rotary driving mechanisms are positioned in the corresponding rectangular grooves, one sides of the two first gears, which are far away from each other, are respectively meshed with the corresponding rotary driving mechanisms, the top of the square-shaped rod is fixedly connected with a force-borrowing driving mechanism, the force-borrowing driving mechanism is rotatably installed between the inner wall of the front side and the inner wall of the rear side of the fishing pipe, the force-borrowing driving mechanism is fixedly connected with the inner wall of the left side of the fishing pipe, and the force-borrowing driving mechanism is located above the movable seat and matched with the movable seat.
Preferably, the rotary driving mechanism comprises a rectangular rod, two tension springs and a first rack, the tops of one sides, close to each other, of the two rectangular rods are fixedly mounted on the two sides of the clip rod respectively, the two first racks are fixedly embedded in the bottoms of one sides, close to each other, of the two rectangular rods respectively, the rectangular rods are located in corresponding rectangular grooves, one sides, far away from each other, of the two first gears are meshed with the corresponding first racks respectively, and the top ends and the bottom ends of the tension springs are fixedly connected with the inner walls of the tops of the corresponding rectangular grooves and the top ends of the rectangular rods respectively.
Preferably, borrow formula actuating mechanism includes second rack, third rack, second gear, fixing base and guide bar, the left side of fixing base and the left side inner wall fixed connection of salvaging the pipe, the bottom of second rack and the top left side fixed connection who returns the shape pole, the second gear rotates and installs between the front side inner wall and the rear side inner wall of salvaging the pipe, the top of guide bar and the bottom right side fixed connection of fixing base, the third rack is located and overlaps on the guide bar with sliding sleeve in returning the shape pole, the second gear meshing is between the right side of second rack and the left side of third rack, the third rack is located the top of removing the seat and cooperatees with removing the seat.
Preferably, electric telescopic handle's left side is fixed and electric connection has first wireless remote control switch, the right side fixed mounting of battery have with electro-magnet electric connection's second wireless remote control switch, first wireless remote control switch and second wireless remote control switch all with battery electric connection, first wireless remote control switch and second wireless remote control switch all match and are provided with outside remote controller.
Preferably, two pin shafts are fixedly connected between the front inner wall and the rear inner wall of the fishing pipe, a round hole is formed in the front side of the first gear, a first bearing is fixedly sleeved in the round hole, and an inner ring of the first bearing is fixedly sleeved on the outer side of the corresponding pin shaft.
Preferably, the embedded grooves are formed in one sides, close to each other, of the two rectangular rods, and the inner walls of the embedded grooves are fixedly connected with the outer sides of the corresponding first racks.
Preferably, the top end of the third rack is provided with a rectangular hole in sliding connection with the outer side of the guide rod, the right side of the second rack is fixedly connected with a limiting block, and the limiting block is located above the second gear.
Preferably, the front side and the rear side of the second gear are both fixedly connected with a rotating shaft, the inner wall of the front side and the inner wall of the rear side of the fishing pipe are both fixedly connected with a second bearing, and the inner ring of the second bearing is fixedly sleeved with the outer side of the corresponding rotating shaft.
Compared with the prior art, the beneficial effects of the utility model are that:
the device is lowered into an oil well by an external rope through a salvaging pipe, a moving seat, a connecting seat, an electromagnet, an electric telescopic rod, a storage battery, a first gear, a baffle plate, a rectangular groove, a clip rod, a rectangular rod, a first rack, a fixed seat, a second rack, a guide rod, a third rack and a second gear which are matched with a tension spring, personnel start the electromagnet through an external remote controller to generate magnetic force and adsorb and collect small iron falling objects, after standing for ten seconds, the electric telescopic rod is controlled to be started reversely by the external remote controller to drive the moving seat to slide upwards, and the moving seat drives the adsorbed small iron falling objects to move upwards through the connecting seat and the electromagnet to be collected into the salvaging pipe;
when the moving seat moves upwards to be in contact with the bottom of a third rack, the moving seat which moves upwards continuously extrudes to drive the third rack to slide upwards on the guide rod, the third rack drives the second rack to move downwards through a second gear, the second rack drives two rectangular rods to downwards stretch corresponding tension springs respectively through a clip-shaped rod, the rectangular rods drive corresponding first racks to move downwards, the two first racks drive two baffles to rotate towards the direction close to each other through the two first gears, the two baffles gradually rotate to be horizontal, and form shielding plugs below collected small iron falling objects, so that the purpose of quickly shielding and plugging the bottom after fishing is realized;
after the small iron falling object is removed, when the collected small iron falling object needs to be taken out, the electric telescopic rod is reversely started to drive the movable seat to gradually relax the extrusion force on the third rack, the elastic force of the tension spring in the stretching state drives the corresponding rectangular rod to move back downwards, the rectangular rod drives the baffle plate to rotate downwards through the corresponding first rack and the corresponding first gear to remove plugging, the electromagnet is closed, and the small iron falling object can fall downwards.
The utility model discloses the mode of being convenient for inhale through magnetism is salvaged the collection to the little ironware junk that falls into in the well, and is convenient for shelter from the shutoff to the bottom fast after salvaging, effectively avoids taking place the phenomenon that little ironware junk dropped once more when upwards shifting out, improves and salvages collection stability, and is convenient for take out the little ironware of salvaging fast after shifting out, satisfies the user demand.
Drawings
FIG. 1 is a schematic structural view of a junk collecting device for overhaul in oil well operation according to the present invention;
fig. 2 is a schematic sectional structure view of fig. 1.
In the figure: 1 salvage pipe, 2 removal seats, 3 connecting seats, 4 electromagnets, 5 electric telescopic rods, 6 storage batteries, 7 first gears, 8 baffles, 9 rectangular grooves, 10-shaped rods, 11 rectangular rods, 12 first racks, 13 fixing seats, 14 second racks, 15 guide rods, 16 third racks, 17 second gears and 18 extension springs.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments.
Referring to fig. 1-2, a junk collecting device for overhauling petroleum underground operation comprises a fishing pipe 1, the inner side of the fishing pipe 1 is square, the top end of the fishing pipe 1 is fixedly connected with an arc-shaped connecting rod, a moving seat 2 is slidably sleeved in the fishing pipe 1, the bottom of the moving seat 2 is fixedly connected with a connecting seat 3, the bottom of the connecting seat 3 is fixedly connected with an electromagnet 4, an electric telescopic rod 5 is fixedly installed on the inner wall of the left side of the fishing pipe 1, the extending end of the electric telescopic rod 5 is fixedly connected with the top of the moving seat 2, and a storage battery 6 electrically connected with the electric telescopic rod 5 and the electromagnet 4 is fixedly installed on the inner wall of the left side of the fishing pipe 1;
two first gears 7 are rotatably installed between the front inner wall and the rear inner wall of the fishing pipe 1, the bottom of each first gear 7 is fixedly connected with a baffle 8, the two baffles 8 are both positioned below the movable seat 2, a clip-shaped rod 10 is slidably sleeved in the fishing pipe 1, the clip-shaped rod 10 is sleeved on the electric telescopic rod 5, rectangular grooves 9 are formed in the inner walls of the two sides of the fishing pipe 1, rotary driving mechanisms are fixedly connected to the two sides of the clip-shaped rod 10, the rotary driving mechanisms are positioned in the corresponding rectangular grooves 9, one sides, away from each other, of the two first gears 7 are respectively meshed with the corresponding rotary driving mechanisms, the top of the clip-shaped rod 10 is fixedly connected with a force borrowing driving mechanism, the force borrowing driving mechanism is rotatably installed between the front inner wall and the rear inner wall of the fishing pipe 1, the force borrowing driving mechanism is fixedly connected with the left inner wall of the fishing pipe 1, and the force borrowing driving mechanism is positioned above the movable seat 2 and matched with the movable seat 2;
the rotary driving mechanism comprises a rectangular rod 11, two tension springs 18 and first racks 12, the tops of the two sides, close to each other, of the rectangular rods 11 are fixedly installed on the two sides of the rectangular rod 10 respectively, the two first racks 12 are fixedly embedded in the bottoms of the two sides, close to each other, of the rectangular rods 11 respectively, the rectangular rods 11 are located in the corresponding rectangular grooves 9, the sides, far away from each other, of the two first gears 7 are meshed with the corresponding first racks 12 respectively, and the top ends and the bottom ends of the tension springs 18 are fixedly connected with the inner walls of the tops of the corresponding rectangular grooves 9 and the top ends of the rectangular rods 11 respectively;
the force-assisting driving mechanism comprises a second rack 14, a third rack 16, a second gear 17, a fixed seat 13 and a guide rod 15, the left side of the fixed seat 13 is fixedly connected with the inner wall of the left side of the fishing pipe 1, the bottom end of the second rack 14 is fixedly connected with the left side of the top of the clip rod 10, the second gear 17 is rotatably installed between the inner wall of the front side and the inner wall of the rear side of the fishing pipe 1, the top end of the guide rod 15 is fixedly connected with the right side of the bottom of the fixed seat 13, the third rack 16 is positioned in the clip rod 10 and is sleeved on the guide rod 15 in a sliding manner, the second gear 17 is meshed between the right side of the second rack 14 and the left side of the third rack 16, and the third rack 16 is positioned above the movable seat 2 and is matched with the movable seat 2, the utility model is convenient for fishing and collecting small iron falls in a well by a magnetic attraction manner, is convenient for blocking and plugging the bottom quickly after fishing, and effectively avoids the phenomenon that the small iron falls off again when moving upwards, improve and salvage and collect stability, and be convenient for take out the iron that salvages little junk fast after shifting out, satisfy the user demand.
In the utility model, the left side of the electric telescopic rod 5 is fixedly and electrically connected with a first wireless remote control switch, the right side of the storage battery 6 is fixedly provided with a second wireless remote control switch electrically connected with the electromagnet 4, the first wireless remote control switch and the second wireless remote control switch are both electrically connected with the storage battery 6, the first wireless remote control switch and the second wireless remote control switch are both provided with an external remote controller in a matching way, two pin shafts are fixedly connected between the front inner wall and the rear inner wall of the salvage pipe 1, the front side of the first gear 7 is provided with a round hole, the round hole is internally and fixedly sleeved with a first bearing, the inner ring of the first bearing is fixedly sleeved with the outer side of the corresponding pin shaft, one side of the two rectangular rods 11 close to each other is provided with an embedded groove, the inner wall of the embedded groove is fixedly connected with the outer side of the corresponding first rack 12, the top end of the third rack 16 is provided with a rectangular hole which is slidably connected with the outer side of the guide rod 15, the right side fixedly connected with stopper of second rack 14, and the stopper is located the top of second gear 17, the equal fixedly connected with pivot in front side and the rear side of second gear 17, salvage the equal fixedly connected with second bearing on pipe 1's the front side inner wall and the rear side inner wall, the inner circle of second bearing and the fixed suit in the outside of the pivot that corresponds, the utility model discloses be convenient for salvage the collection to the little ironware junk that falls into in the well through the mode of magnetism, and be convenient for shelter from the shutoff fast to the bottom after salvaging, the phenomenon that the little ironware junk dropped once more takes place when effectively avoiding upwards shifting out, improve and salvage stability, and be convenient for collect the little ironware that takes out the salvage after shifting out fast, satisfy the user demand.
The working principle is as follows: when the device is used, a rope is tied on an arc-shaped connecting rod on the fishing pipe 1, the device is placed into an oil well through the rope, then a person controls a second wireless remote control switch through an external remote controller to turn on the electromagnet 4, the electromagnet 4 generates magnetic force to adsorb and collect small iron falling objects falling in the well, after ten seconds of standing, the external remote controller is used for controlling a first wireless remote control switch to control the electric telescopic rod 5 to be started reversely, the electric telescopic rod 5 drives the moving seat 2 to slide upwards in the fishing pipe 1, the moving seat 2 drives the electromagnet 4 to move upwards through the connecting seat 3, and the electromagnet 4 drives the adsorbed small iron falling objects to move upwards and collect the small iron falling objects into the fishing pipe 1;
when the moving seat 2 moves upwards to contact with the bottom of the third rack 16, the moving seat 2 which moves upwards continuously extrudes to drive the third rack 16 to move upwards, the third rack 16 slides upwards on the guide rod 15, the third rack 16 drives the second gear 17 to rotate anticlockwise, the second gear 17 drives the second rack 14 which is meshed with the second rack to move downwards, the second rack 14 drives the square rod 10 to slide downwards in the fishing pipe 1, the square rod 10 drives the two rectangular rods 11 to move downwards, the rectangular rods 11 stretch the corresponding two tension springs 18, the rectangular rods 11 drive the corresponding first racks 12 to move downwards, the two first racks 12 move downwards to drive the two first gears 7 to rotate relatively, the two first gears 7 drive the two baffles 8 to rotate towards the direction which is close to each other, the two baffles 8 gradually rotate to the horizontal direction, and at the moment, the two baffles 8 form a blocking plug under the collected small iron falling objects, the purpose of quickly shielding and plugging the bottom after fishing is realized, the phenomenon that small iron falling objects fall again when the small iron falling objects are moved upwards out is effectively avoided, and the collection stability is improved;
after the removal, when the collected small iron falling objects need to be taken out, the electric telescopic rod 5 is reversely started to drive the moving seat 2 to gradually relax the extrusion force on the third rack 16 downwards, the elastic force of the tension spring 18 in the stretching state drives the corresponding rectangular rod 11 to move back downwards, the rectangular rod 11 drives the corresponding first rack 12 to move back downwards, the first rack 12 drives the baffle plate 8 to rotate downwards through the corresponding first gear 7 to remove the blockage, the electromagnet 4 is closed at the moment, and the small iron falling objects can fall out downwards at the moment, so that the small iron falling objects are taken out.
The above, only be the concrete implementation of the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art is in the technical scope of the present invention, according to the technical solution of the present invention and the utility model, the concept of which is equivalent to replace or change, should be covered within the protection scope of the present invention.
Claims (8)
1. The device for collecting the junk for overhauling the underground petroleum operation comprises a fishing pipe (1), wherein the inner side of the fishing pipe (1) is square, the top end of the fishing pipe (1) is fixedly connected with an arc-shaped connecting rod, and is characterized in that a movable seat (2) is sleeved in the fishing pipe (1) in a sliding manner, a connecting seat (3) is fixedly connected to the bottom of the movable seat (2), an electromagnet (4) is fixedly connected to the bottom of the connecting seat (3), an electric telescopic rod (5) is fixedly installed on the inner wall of the left side of the fishing pipe (1), the extending end of the electric telescopic rod (5) is fixedly connected with the top of the movable seat (2), and a storage battery (6) electrically connected with the electric telescopic rod (5) and the electromagnet (4) is fixedly installed on the inner wall of the left side of the fishing pipe (1);
two first gears (7) are rotatably installed between the front inner wall and the rear inner wall of the fishing pipe (1), the bottom of each first gear (7) is fixedly connected with a baffle (8), the two baffles (8) are both positioned below the movable seat (2), a clip-shaped rod (10) is sleeved in the fishing pipe (1) in a sliding manner, the clip-shaped rod (10) is sleeved on the electric telescopic rod (5), rectangular grooves (9) are respectively formed in the inner walls of the two sides of the fishing pipe (1), rotary driving mechanisms are respectively and fixedly connected to the two sides of the clip-shaped rod (10), the rotary driving mechanisms are positioned in the corresponding rectangular grooves (9), one sides of the two first gears (7) which are far away from each other are respectively meshed with the corresponding rotary driving mechanisms, the top of the clip-shaped rod (10) is fixedly connected with a force type driving mechanism, the force type driving mechanism is rotatably installed between the front inner wall and the rear inner wall of the fishing pipe (1), the force-borrowing driving mechanism is fixedly connected with the inner wall of the left side of the fishing pipe (1), is positioned above the movable seat (2) and is matched with the movable seat (2).
2. The device for collecting the junk in the underground petroleum operation overhaul according to claim 1, wherein the rotary driving mechanism comprises a rectangular rod (11), two tension springs (18) and first racks (12), the tops of the two sides, close to each other, of the two rectangular rods (11) are fixedly mounted on the two sides of the clip-shaped rod (10) respectively, the two first racks (12) are fixedly embedded in the bottoms of the two sides, close to each other, of the two rectangular rods (11) respectively, the rectangular rods (11) are located in the corresponding rectangular grooves (9), the sides, far away from each other, of the two first gears (7) are meshed with the corresponding first racks (12) respectively, and the top ends and the bottom ends of the tension springs (18) are fixedly connected with the inner wall of the tops of the corresponding rectangular grooves (9) and the top ends of the rectangular rods (11) respectively.
3. The device for collecting the junk in the overhaul of the oil downhole operation according to claim 1, wherein the borrowing type driving mechanism comprises a second rack (14), a third rack (16), a second gear (17), a fixed seat (13) and a guide rod (15), the left side of the fixed seat (13) is fixedly connected with the inner wall of the left side of the fishing pipe (1), the bottom end of the second rack (14) is fixedly connected with the left side of the top of the clip rod (10), the second gear (17) is rotatably installed between the inner wall of the front side and the inner wall of the rear side of the fishing pipe (1), the top end of the guide rod (15) is fixedly connected with the right side of the bottom of the fixed seat (13), the third rack (16) is positioned in the clip rod (10) and is slidably sleeved on the guide rod (15), the second gear (17) is meshed between the right side of the second rack (14) and the left side of the third rack (16), the third rack (16) is positioned above the movable seat (2) and is matched with the movable seat (2).
4. The device for collecting the junk for overhauling the petroleum underground operation according to claim 1, wherein a first wireless remote control switch is fixedly and electrically connected to the left side of the electric telescopic rod (5), a second wireless remote control switch electrically connected with the electromagnet (4) is fixedly installed on the right side of the storage battery (6), the first wireless remote control switch and the second wireless remote control switch are electrically connected with the storage battery (6), and the first wireless remote control switch and the second wireless remote control switch are provided with external remote controllers in a matching manner.
5. The device for collecting the junk for overhauling the oil downhole operation according to claim 1, wherein two pin shafts are fixedly connected between the front inner wall and the rear inner wall of the fishing pipe (1), a round hole is formed in the front side of the first gear (7), a first bearing is fixedly sleeved in the round hole, and an inner ring of the first bearing is fixedly sleeved with the outer side of the corresponding pin shaft.
6. The device for collecting junk in the underground petroleum operation and overhaul as claimed in claim 2, wherein the two rectangular rods (11) are provided with an embedded groove on the side close to each other, and the inner wall of the embedded groove is fixedly connected with the outer side of the corresponding first rack (12).
7. The device for collecting the junk in the underground petroleum well for overhauling according to claim 3, wherein a rectangular hole connected with the outer side of the guide rod (15) in a sliding manner is formed at the top end of the third rack (16), a limiting block is fixedly connected to the right side of the second rack (14), and the limiting block is positioned above the second gear (17).
8. The device for collecting the junk in the overhaul of the oil downhole operation according to claim 3, wherein the front side and the rear side of the second gear (17) are both fixedly connected with a rotating shaft, the inner wall of the front side and the inner wall of the rear side of the fishing pipe (1) are both fixedly connected with a second bearing, and the inner ring of the second bearing is fixedly sleeved with the outer side of the corresponding rotating shaft.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122014137.0U CN215292413U (en) | 2021-08-25 | 2021-08-25 | Device is collected with junk in oil borehole operation overhaul |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122014137.0U CN215292413U (en) | 2021-08-25 | 2021-08-25 | Device is collected with junk in oil borehole operation overhaul |
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| Publication Number | Publication Date |
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| CN215292413U true CN215292413U (en) | 2021-12-24 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202122014137.0U Active CN215292413U (en) | 2021-08-25 | 2021-08-25 | Device is collected with junk in oil borehole operation overhaul |
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| CN (1) | CN215292413U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114704220A (en) * | 2022-03-15 | 2022-07-05 | 西南石油大学 | Electromagnetic fishing device for horizontal well |
-
2021
- 2021-08-25 CN CN202122014137.0U patent/CN215292413U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114704220A (en) * | 2022-03-15 | 2022-07-05 | 西南石油大学 | Electromagnetic fishing device for horizontal well |
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