CN113153201B

CN113153201B - Fishing tool for downhole operation

Info

Publication number: CN113153201B
Application number: CN202110657899.4A
Authority: CN
Inventors: 张仕杰
Original assignee: Shandong Xinding Technology Co Ltd
Current assignee: Daqing Naigu Petroleum Machinery Equipment Manufacturing Co ltd
Priority date: 2021-06-15
Filing date: 2021-06-15
Publication date: 2022-11-22
Anticipated expiration: 2041-06-15
Also published as: CN113153201A

Abstract

The invention relates to the technical field of oil and petroleum exploitation, in particular to a fishing tool for underground operation, which comprises a shell, a first power mechanism, a stabilizing mechanism, a second power mechanism, a first grabbing mechanism and a second grabbing mechanism, wherein the first power mechanism, the second power mechanism and the second grabbing mechanism are sequentially arranged inside the shell; this scheme is through power unit, firm mechanism and snatch the mechanism, improves fishing tool stability and the variety of salvaging in the pit, satisfies the salvage work in different oil wells, improves salvage efficiency, reduces use cost.

Description

Fishing tool for downhole operation

Technical Field

The invention relates to the technical field of oil exploitation, in particular to an underground operation fishing tool.

Background

In the process of oil exploitation, because the stratum conditions of some oil wells are complex, the condition of a shaft is poor, and in the process of logging construction, a logging instrument or a logging tool can be stuck or fall into the well, so that engineering accidents and great loss are caused.

In the existing underground fishing technology, a fisher is mostly adopted for fishing, when a worker puts the fisher into a well, the fisher is easy to shake and collide with a well wall in the lowering and lifting process due to the fact that the diameter of the fisher is smaller than the diameter of a well head, so that the fishing tool and the well wall are damaged, and meanwhile, the salvaged tool instrument is easy to fall off secondarily to cause secondary damage; in addition, in current fishing tool technique, a fishing tool generally can only salvage to a kind of thing that drops, if under the more circumstances of the thing kind that drops in the pit, just need salvage at every turn after having salvaged the thing that drops of a type, change fishing head or fishing tool, salvage again, this process is wasted time and energy, has increased the cost of salvage.

Disclosure of Invention

The invention aims to solve the problems that fishing tools and a well wall are damaged due to the fact that the fishing tools shake in the underground, the types of fishing objects are limited by the fishing tools and the like in the prior art, and provides an underground operation fishing tool.

The technical scheme of the invention is as follows:

a fishing tool for underground operation is characterized by comprising a shell, a first power mechanism, a stabilizing mechanism, a second power mechanism, a first grabbing mechanism and a second grabbing mechanism, wherein the first power mechanism, the second power mechanism and the second grabbing mechanism are sequentially arranged inside the shell;

a first mounting plate for mounting the first power mechanism and a second mounting plate for mounting the second power mechanism are fixedly arranged in the shell, and the first power mechanism penetrates through the first mounting plate and then is fixedly connected with the stabilizing mechanism;

the stabilizing mechanism comprises a connecting rod and a supporting plate contacted with the well wall, one end of the connecting rod is connected with a second lug arranged on the supporting plate, and the other end of the connecting rod is connected with the first power mechanism; a plurality of rollers are uniformly arranged on one side of the supporting plate close to the well wall, and blocking pieces are arranged at two ends of the supporting plate;

the first grabbing mechanism comprises a grabbing rod, the grabbing rod is rotatably mounted on the shell, one end of the grabbing rod is connected with the second power mechanism, the other end of the grabbing rod is provided with a grabbing hook, one end of the grabbing rod, which is close to the grabbing hook, is also provided with a driving rod, the upper end surface and the lower end surface of the driving rod are provided with teeth, the upper side and the lower side of the driving rod are respectively provided with a first driving gear and a second driving gear which are meshed with the driving rod for driving, and one side, corresponding to the driving rod, of the first driving gear is provided with a fixed drilling rod for fixing a salvage; a reversing gear is arranged between the second driving gear and the grapple, one side of the reversing gear is meshed with the second driving gear, and the other side of the reversing gear is meshed with a third driving gear arranged on the grapple.

Furthermore, a first power mechanism comprises a first hydraulic cylinder and a first telescopic rod, one end of the first telescopic rod is fixedly connected with the first hydraulic cylinder, the other end of the first telescopic rod penetrates through the mounting joint fixedly connected with the rear portion of the first mounting plate, and a first support lug used for connecting the connecting rod is arranged on the mounting joint.

Furthermore, two fixing plates with hollow interiors are symmetrically arranged on the top end face of the first mounting plate, and filling fibers are filled in the fixing plates; a sliding bearing is arranged between the two fixing plates and sleeved outside the first telescopic rod; the fixed plates are fixedly provided with vertically arranged pillars, supporting slide blocks are arranged at positions close to the top and the bottom of each pillar, and the supporting slide blocks are connected with the first hydraulic cylinders through connecting pieces; the top terminal surface and the bottom terminal surface of first pneumatic cylinder all install the shock absorber of symmetry setting.

Furthermore, openings for the connecting rods to pass through are formed in two sides of the shell, and adapter brackets for limiting the positions of the connecting rods are arranged on two sides of each opening; the connecting rod is rotatably connected with the switching support, the first support lug and the second support lug through pin shafts.

Furthermore, the second power mechanism comprises two second hydraulic cylinders symmetrically arranged on the second mounting plate, and the second hydraulic cylinders penetrate through the second mounting plate; the bottom end of the second hydraulic cylinder is connected with the grabbing rod, and a stop ring for limiting the position of the grabbing rod is arranged at the connecting position of the bottom end of the second hydraulic cylinder and the grabbing rod; the second mounting plate is further provided with a groove, a clamping ring used for stabilizing the second hydraulic cylinder is installed in the groove, and the clamping ring is fixed on the second mounting plate through screws.

Furthermore, the second snatchs the mechanism and includes the second telescopic link and snatchs the drill bit, the second snatchs the mechanism fixed mounting be in on the bottom surface of second mounting panel, snatch drill bit fixed connection be in on the second telescopic link.

Furthermore, a contact plate which is perpendicular to the side wall of the shell is arranged at the bottom end of the shell, and the contact plate is rotatably connected with the shell through a rotating shaft; a touch switch for controlling the second grabbing mechanism to start and stop is installed on the inner wall of the shell, and a touch device for triggering the touch switch is arranged on the contact plate; the touch switch is connected with the second grabbing mechanism through a connecting line.

Further, lifting rings are symmetrically arranged on the end surface of the top of the outer side of the shell, and lifting ropes for lifting the fishing tool are arranged in the lifting rings; the top end face of the shell is also provided with a controller, the controller is connected with a transmission line, and the controller is connected with the first hydraulic cylinder through an oil outlet pipe; the inside conveyer pipe that is used for transmitting hydraulic oil that still is provided with of shell, the bottom of conveyer pipe with the second pneumatic cylinder is connected, the conveyer pipe top is passed through the oil pipe with the controller is connected.

Furthermore, the grabbing rod is rotatably connected with the shell through the rotating shaft, a groove is formed in the top of the grabbing rod, and the baffle ring is slidably mounted in the groove; a fixed drill bit is arranged at one end, close to the salvage object, of the fixed drill rod, the fixed drill bit is rotatably connected with the fixed drill rod through a rotating bearing, a first sliding groove is formed in the fixed drill rod, the first sliding groove is installed on the grabbing rod through a first positioning bolt, and the first positioning bolt is fixedly arranged on the grabbing rod; a second sliding groove is formed in the driving rod and is fixed on the grabbing rod through a second positioning bolt which is fixedly arranged on the grabbing rod; one end of the driving rod, which is close to the salvage object, is also provided with a sliding curved surface; the grab hook is provided with a barb for hooking the rope cable.

Furthermore, the baffle plate is made of high manganese steel.

The invention has the beneficial effects that:

(1) According to the underground operation fishing tool provided by the invention, the stabilizing mechanism and the first grabbing mechanism are arranged, so that on one hand, in the process of lowering or lifting the fishing tool, the stabilizing mechanism can enable the whole fishing tool to be in a stable moving state, the fishing tool is prevented from shaking, the contact and collision between the fishing tool and the well wall are fundamentally eliminated, and in addition, the adjustable stabilizing mechanism can enable the fishing tool to meet the well holes with different diameters; on the other hand, the first mechanism of snatching that sets up can snatch different kinds of salvage to can fix the salvage, prevent that it from producing the phenomenon that drops at the promotion in-process.

(2) According to the underground operation fishing tool provided by the invention, the driving mechanism is arranged, so that the fishing tool can automatically clamp and further fix the salvaged objects in the process of grabbing the salvaged objects, the salvage success rate is higher, and the salvage effect is better.

(3) According to the fishing tool for underground operation, the second grabbing mechanism is arranged, so that when a thin rod with a small diameter is aimed at, the thin rod cannot be effectively fished by the first grabbing mechanism, the second grabbing mechanism is drilled into the rod for fishing through the contact structure and the controller, convenience and rapidness are achieved, and the application range of the fishing tool is expanded.

Drawings

FIG. 1 is a schematic view of the overall structure of a fishing tool for downhole operations according to the present invention;

FIG. 2 is a schematic view of the fishing tool for downhole operations according to the present invention;

FIG. 3 is a schematic view of a fixing mechanism according to the present invention;

FIG. 4 is an enlarged view of portion A of FIG. 1;

FIG. 5 is an enlarged view of portion B of FIG. 1;

FIG. 6 is an enlarged view of portion C of FIG. 1;

FIG. 7 is an enlarged view of portion D of FIG. 1;

FIG. 8 is an enlarged view of section E of FIG. 1;

in the figure, 1, a housing; 101. a first mounting plate; 102. a second mounting plate; 103. a hoisting ring; 104. a lifting rope; 105. a controller; 106. a transmission line; 107. opening a hole; 108. a transfer bracket; 109. a support post; 110. a shock absorber; 111. an oil outlet pipe; 112. a delivery pipe; 113. a support slide block; 114. a connecting member; 115. a fixing plate; 116. a sliding bearing; 117. filling fibers; 118. a contact plate; 2. a first power mechanism; 201. a first hydraulic cylinder; 202. a first telescopic rod; 203. installing a connector; 204. a first lug; 205. an interface; 3. a stabilizing mechanism; 301. a connecting rod; 302. a support plate; 303. a baffle plate; 304. a roller; 305. a second lug; 4. a second power mechanism; 401. a second hydraulic cylinder; 402. a snap ring; 403. a screw; 404. a baffle ring; 5. a first grasping mechanism; 501. a grabbing rod; 502. grooving; 503. fixing the drill rod; 5031. a first chute; 504. a first positioning pin; 505. a rotating bearing; 506. fixing a drill bit; 507. a first drive gear; 508. a drive rod; 5081. a second chute; 5082. a sliding curved surface; 509. a second positioning bolt; 510. a second drive gear; 511. a reversing gear; 512. a third drive gear; 513. a grapple; 6. a second grasping mechanism; 601. a second telescopic rod; 602. grabbing the drill bit; 603. a connecting wire; 604. a touch device; 605. a touch switch; 7. a rotating shaft.

Detailed Description

In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and do not limit the invention.

It is to be understood that the terms "up-down, right-left, two-end, vertical, inside, outside, middle, top, bottom, two-sides, above," etc., indicate orientations or positional relationships that are based on the orientations or positional relationships shown in the drawings, are only used for convenience in describing the invention and simplifying the description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed in a particular orientation, and be operated, and therefore should not be construed as limiting the invention.

Furthermore, the terms "first, second, third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated; thus, a feature defined as "first, second or third" may explicitly or implicitly include one or more of that feature.

As shown in fig. 1 to 8, the fishing tool for downhole operation provided by the present invention comprises a housing 1, a first power mechanism 2, a stabilizing mechanism 3, a second power mechanism 4, a first grabbing mechanism 5 and a second grabbing mechanism 6; the first power mechanism 2, the second power mechanism 4 and the second grabbing mechanism 6 are vertically arranged inside the shell 1 from top to bottom in sequence, the stabilizing mechanisms 3 are symmetrically arranged on two sides of the outer portion of the shell 1, and the positions of the stabilizing mechanisms 3 are located in the middle of the shell 1; in addition, the first grabbing mechanism 5 is rotatably arranged on the shell 1 and close to the bottom of the shell 1 and used for grabbing salvage; a first mounting plate 101 and a second mounting plate 102 which are horizontally arranged are fixedly mounted in the shell 1, the first mounting plate 101 is positioned above the second mounting plate 102, a first power mechanism 2 is mounted on the first mounting plate 101, and the first power mechanism 2 penetrates through the first mounting plate 101 and then is connected with a stabilizing mechanism 3 and is used for driving the stabilizing mechanism 3 to open and close so as to extend or contract; the second power mechanism 4 is mounted on the second mounting plate 102 for powering the first gripping mechanism 5.

As shown in fig. 1 and fig. 3, the stabilizing mechanism 3 includes a connecting rod 301 and a supporting plate 302, the supporting plate 302 is used for connecting with the borehole wall, one end of the connecting rod 301 is rotatably connected with a second lug 305 disposed on the supporting plate 302, the other end is connected to the first power mechanism 2, and the first power mechanism 2 drives the supporting plate 302 to move through the connecting rod 301, so as to play a role of stabilizing and supporting the whole fishing tool; in addition, as shown in fig. 3, the both ends at the backup pad are all fixedly mounted with separation blade 303 for stopping and peeling off impurity or attachment on the wall of a well, avoid it to cause the damage to connecting rod 301 and backup pad 302, and one side that is close to the wall of a well at backup pad 302, evenly install a plurality of gyro wheel 304, through setting up gyro wheel 304, reduce the friction loss between backup pad 302 and the wall of a well, the functional loss of reducing device, and improve the life of device.

Further, as shown in fig. 1, 7 and 8, the first grabbing mechanism includes a grabbing rod 501, the grabbing rod 501 is curved and rotatably installed at a position close to the bottom of the housing 1, the top end of the grabbing rod 501 is connected to the second power mechanism 4, and the bottom end of the grabbing rod 501 is provided with a grabbing hook 513; a driving rod 508 is arranged at one end of the grabbing rod 501 close to the grabbing hook 513, the driving rod 508 is perpendicular to the grabbing rod 501, and teeth are uniformly arranged on the upper end surface and the lower end surface of the driving rod 508; a first driving gear 507 and a second driving gear 510 are respectively arranged at the upper side and the lower side of the driving rod 508, the first driving gear 507 and the second driving gear 510 are meshed with teeth on the driving rod 508, and the driving rod 508 drives the first driving gear 507 and the second driving gear 510 to rotate; a fixed drill rod 503 is arranged above the first driving gear 507, the fixed drill rod 503 and the driving rod 508 are symmetrically arranged relative to the first driving gear 507, and the first driving gear 507 drives the fixed drill rod 503 to move so as to achieve the effect of fixing a salvage object; a reversing gear 511 is arranged between the second driving gear 510 and the grapple 513, one side of the reversing gear 511 is meshed with the second driving gear 510, the other side is meshed with a third driving gear 512 arranged on the grapple 513, the output rotation direction of the second driving gear 510 is converted through the reversing gear 511, the grapple 513 is driven to rotate through the third driving gear 512, and the salvage or the clamp is performed on the salvage.

Further, as shown in fig. 1, in a specific embodiment, the first power mechanism 2 includes a first hydraulic cylinder 201 and a first telescopic rod 202, one end of the first telescopic rod 202 is fixedly connected to an end of the first hydraulic cylinder 201, the other end of the first telescopic rod is fixedly provided with an installation joint 203, the installation joint 203 is connected to the connecting rod 301 for driving the connecting rod 301 to move, the installation joint 203 is further provided with a first lug 204, and an end of the connecting rod 301 is rotatably mounted on the first lug 204.

Further, as shown in fig. 1 and 5, in the specific embodiment, two fixing plates 115 are symmetrically installed on the top end surface of the first installation plate 101, each fixing plate 115 is closely attached to the inner wall of the housing 1 and has a hollow structure inside, and the hollow structure inside the fixing plate 115 is filled with filling fibers 117; a sliding bearing 116 is installed between the two fixing plates 115, and the sliding bearing 116 is clamped; the sliding bearing 116 is further sleeved outside the first telescopic rod 202, so that on one hand, the sliding bearing has a stabilizing effect on the first telescopic rod 202, and on the other hand, the balls in the sliding bearing 116 can effectively reduce friction between the sliding bearing 116 and the first telescopic rod 202, so that the service life of the first telescopic rod 202 is prolonged; in addition, the top end face of each fixing plate 115 is provided with a vertically arranged pillar 109, the bottom end of each pillar 109 is fixedly connected with the fixing plate 115, the top end of each pillar 109 is fixedly connected with the inner wall of the housing 1, a supporting slider 113 is arranged on each pillar 109 at a position close to the top and the bottom of each pillar 109, the supporting slider 113 is connected with the first hydraulic cylinder 201 through a connecting piece 114, and the pillar 109 and the supporting slider 113 are arranged to achieve a stable effect on the first hydraulic cylinder 201 and avoid the first hydraulic cylinder from shaking in the horizontal direction; in addition, all install the shock absorber 110 that the symmetry set up on the top terminal surface and the bottom terminal surface of first pneumatic cylinder 201, through setting up shock absorber 110 and slow down first pneumatic cylinder 201 and transfer or promote the vibrations that the in-process produced at fishing tool, prevent that it from breaking down because of violent vibrations.

It should be noted that, as shown in fig. 1, in a specific embodiment, openings 107 are provided on two sides of the housing 1 for the connection rod 301 to pass through, and a rotating bracket 108 is fixedly provided on the housing 1 at a position close to the opening 107, and the connection rod 301 is rotatably connected to the rotating bracket 108; in addition, the connecting rod 301 is connected with the switching bracket 108, the first lug 204 and the second lug 305 through pins, so that the connecting rod can rotate relative to the first lug 204 and the second lug 305.

Further, as shown in fig. 1 and fig. 6, in a specific embodiment, the second power mechanism 4 includes two second hydraulic cylinders 401, the two second hydraulic cylinders 401 are symmetrically disposed and penetratingly mounted on the second mounting plate 102, bottom ends of the two second hydraulic cylinders 401 are connected to the grabbing bar 501, a stop ring 404 for limiting a position of the grabbing bar 501 is disposed at a position where the second hydraulic cylinder 401 is connected to the grabbing bar 501, and the stop ring 404 is fixedly disposed at a bottom end of the second hydraulic cylinder 401; in addition, a groove is formed in the upper end face of the second mounting plate 102 at a position corresponding to the second hydraulic cylinder 401, a snap ring 402 is installed in the groove, the snap ring 402 is sleeved outside the second hydraulic cylinder 401 and fixed to the second mounting plate 102 through a screw 403, and the snap ring 402 is arranged to play a stabilizing effect on the second hydraulic cylinder 401 to prevent the second hydraulic cylinder from shaking during operation.

It should be explained that, as shown in fig. 1, in the specific embodiment, the second grabbing mechanism 6 includes a second telescopic rod 601 and a grabbing drill 602, the second telescopic rod 601 is vertically and fixedly installed on the lower end surface of the second mounting plate 102, and the grabbing drill 602 is rotatably installed at the bottom end of the second telescopic rod 601 for drilling into the salvage object to fix the salvage object.

Further, as shown in fig. 1 and 7, in one embodiment, the contact plates 118 are mounted at the bottom ends of both sides of the housing 1, the contact plates 118 are perpendicular to the side walls of the housing 1, and the contact plates 118 are rotatably connected to the bottom end of the housing 1 through the rotating shaft 7, so that the contact plates 118 can rotate axially around the rotating shaft 7; a touch switch 605 is installed at the bottom of the inner side wall of the shell 1, and the touch switch 605 is connected with the second grabbing mechanism 6 through a connecting line 603 and used for controlling the start-stop operation of the second grabbing mechanism 6 and further controlling the extension and retraction of the second telescopic rod 601; it should be noted that a touch member 604 for activating a touch switch 606 is mounted on the contact plate 118, and when the contact plate 118 contacts the fishing object and rotates upward to a certain angle, the touch member 604 contacts a touch switch 605, thereby controlling the operation of the second grasping mechanism 6.

It can be understood that, as shown in fig. 1, 4 and 5, in a specific embodiment, two lifting rings 103 are symmetrically installed on the top end surface of the outer side of the housing 1, a lifting rope 104 passes through each lifting ring 103, and the whole fishing tool is lowered and lifted through the lifting rope 104 and the lifting rings 103; in addition, a controller 105 is further installed between the two hanging rings 103, a transmission line 106 is connected to the top of the controller 105, and the controller 105 is connected with the ground equipment through the transmission line 106, so that an operator can control the controller 105; the bottom of the controller 105 is provided with the oil outlet pipe 111, the oil outlet pipe 111 is connected with the first hydraulic cylinder 201 and the delivery pipe 112 arranged inside the housing 1 through a through hole at the top of the housing 1, it should be noted that two delivery pipes 112 are arranged, and are connected with the second hydraulic cylinder 401 after penetrating through the fixing plate 115 and the first mounting plate 101, the oil outlet pipe 111 and the delivery pipe 112 are arranged to deliver hydraulic oil to the first hydraulic cylinder 201 and the second hydraulic cylinder 401, and the flow of the hydraulic oil is controlled by the controller 105, so that the operation of the first hydraulic cylinder 201 and the second hydraulic cylinder 401 is realized.

Further, as shown in fig. 1, 7 and 8, in a specific embodiment, the grabbing rod 501 is also rotatably connected with the housing 1 through the rotating shaft 7, the grabbing rod 501 can axially rotate around the rotating shaft 7, a slot 502 is formed in the top of the grabbing rod 501 for installing the blocking ring 404, and the blocking ring 404 can slide in the slot 502 by the slot 502; it should be noted that a fixed drill 506 is arranged at one end of the fixed drill rod 503 close to the fishery, a first sliding groove 5031 is formed on the fixed drill rod 503, a first positioning bolt 504 is installed in the first sliding groove 5031, the first positioning bolt 504 is fixedly arranged on the grabbing rod 501, and the fixed drill rod 503 is installed on the grabbing rod 501 through the first positioning bolt 504; the fixed drill bit 506 is rotatably connected with the fixed drill rod 503 through the rotating bearing 505, the rotating bearing 505 is fixedly arranged on the fixed drill bit 506, when the fixed drill bit 506 contacts with a salvage object, the rotating bearing 505 is arranged, so that the fixed drill pipe 503 is rotatably drilled into the salvage object in the feeding process of the fixed drill pipe 503, and the salvage object is fixed; similarly, a second sliding groove 5081 is formed in the driving rod 508, a second positioning bolt 509 is installed in the second sliding groove 5081, the second positioning bolt 509 is fixedly arranged on the grabbing rod 501, and the driving rod 508 is slidably installed on the grabbing rod 501 through the second positioning bolt 509; in addition, a sliding curved surface 5082 is arranged at one end, close to the salvage, of the driving rod 508, the sliding curved surface 5082 is smooth and wear-resistant in surface, when the salvage contacts with the sliding curved surface 5082, the driving rod 508 is pushed to move, the fixed drill rod 503 and the grapple 513 are driven to move, and the salvage is grabbed and clamped.

Furthermore, as shown in fig. 3 and 8, in the embodiment, the baffle plate 303 is made of high manganese steel, which has good wear resistance and corrosion resistance, and can effectively prolong the service life of the support plate 302; in addition, a plurality of barbs are uniformly arranged on the grapple 513 for fishing the rope and cable, so that the rope and cable can be hooked and lifted conveniently.

The working process and principle of the invention are as follows:

the integral fishing tool is put into the well from the well mouth through the lifting rope, after the stabilizing mechanism 3 falls into the well, the opening and closing of the stabilizing mechanism 3 are adjusted by controlling the first power mechanism 2, so that the support plate 302 is tightly attached to the inner side of the well wall, the effect of stabilizing the integral fishing tool is achieved, and the fishing tool is prevented from shaking; then, the opening of the first grabbing mechanism 5 is adjusted by controlling the second power mechanism 4, when the grabbing rod 501 approaches the well wall, the driving rod 508 contacts the well wall in advance, at the moment, the driving rod 508 and the grabbing rod 501 move relatively, and when the grabbing rod 501 is developed to the maximum degree, the operation of the second power mechanism 4 is stopped; when the driving rod 508 drives the fixed drill rod 503 and the grapple 513 to move in the process of relative movement of the grabbing rod 501; when the fishing tool falls to the contact of the salvage object, the second power mechanism 4 is controlled to contract, so that the grabbing rod 501 is closed inwards, the driving rod 508 is connected with the salvage object and moves relative to the grabbing rod 501, the fixed drill rod 503 and the grabbing hook 513 are driven to move, and the salvage object is salvaged and fixed.

The foregoing description of the specific embodiments of the present invention has been presented for the purposes of illustration and description and is not intended to limit the invention to the precise form disclosed, and obviously many modifications and variations are possible in light of the above teaching, the examples having been selected and described for the purpose of illustrating the particular principles of the invention and the practical application, thereby enabling others skilled in the art to make and use various embodiments of the invention and various alternatives and modifications. It is intended that the scope of the invention be defined by the claims and their equivalents.

Claims

1. The fishing tool for underground operation is characterized by comprising a shell (1), a first power mechanism (2), a stabilizing mechanism (3), a second power mechanism (4), a first grabbing mechanism (5) and a second grabbing mechanism (6), wherein the first power mechanism (2), the second power mechanism (4) and the second grabbing mechanism (6) are sequentially arranged inside the shell (1), the stabilizing mechanism (3) is arranged on two sides of the outer portion of the shell (1), and the first grabbing mechanism (5) is arranged at a position close to the bottom of the shell (1);

a first mounting plate (101) for mounting the first power mechanism (2) and a second mounting plate (102) for mounting the second power mechanism (4) are fixedly arranged in the shell (1), and the first power mechanism (2) penetrates through the first mounting plate (101) and then is fixedly connected with the stabilizing mechanism (3);

the stabilizing mechanism (3) comprises a connecting rod (301) and a supporting plate (302) contacted with the well wall, one end of the connecting rod (301) is connected with a second supporting lug (305) arranged on the supporting plate (302), and the other end of the connecting rod (301) is connected with the first power mechanism (2); a plurality of rollers (304) are uniformly arranged on one side, close to the well wall, of the supporting plate (302), and blocking pieces (303) are arranged at two ends of the supporting plate (302);

the first grabbing mechanism (5) comprises a grabbing rod (501), the grabbing rod (501) is rotatably installed on the shell (1), one end of the grabbing rod (501) is connected with the second power mechanism (4), the other end of the grabbing rod (501) is provided with a grabbing hook (513), one end, close to the grabbing hook (513), of the grabbing rod (501) is further provided with a driving rod (508), the upper end face and the lower end face of the driving rod (508) are provided with teeth, the upper side and the lower side of the driving rod (508) are respectively provided with a first driving gear (507) and a second driving gear (510) which are meshed with the driving rod (508) for driving, and one side, corresponding to the driving rod (508), of the first driving gear (507) is provided with a fixed drill rod (503) for fixing salvaged objects; a reversing gear (511) is arranged between the second driving gear (510) and the grapple (513), one side of the reversing gear (511) is meshed with the second driving gear (510), and the other side of the reversing gear is meshed with a third driving gear (512) arranged on the grapple (513).

2. A fishing tool for underground operation according to claim 1, wherein the first power mechanism (2) comprises a first hydraulic cylinder (201) and a first telescopic rod (202), one end of the first telescopic rod (202) is fixedly connected with the first hydraulic cylinder (201), the other end of the first telescopic rod penetrates through the first mounting plate (101) and is fixedly connected with a mounting joint (203), and a first support lug (204) for connecting the connecting rod (301) is arranged on the mounting joint (203).

3. A fishing tool for downhole operations according to claim 2, characterized in that two fixing plates (115) with hollow inside are symmetrically installed on the top end face of the first mounting plate (101), and the fixing plates (115) are internally filled with filling fibers (117); a sliding bearing (116) is arranged between the two fixing plates (115), and the sliding bearing (116) is sleeved outside the first telescopic rod (202); the fixed plate (115) is fixedly provided with vertically arranged pillars (109), supporting sliding blocks (113) are arranged on the pillars (109) at positions close to the top and the bottom, and the supporting sliding blocks (113) are connected with the first hydraulic cylinder (201) through connecting pieces (114); the top end face and the bottom end face of the first hydraulic cylinder (201) are both provided with shock absorbers (110) which are symmetrically arranged.

4. A fishing tool for downhole operation according to claim 1, characterized in that the housing (1) is provided with openings (107) at both sides for the connection rods (301) to pass through, and adapter brackets (108) for limiting the positions of the connection rods (301) are provided at both sides of the openings (107); the connecting rod (301) is rotatably connected with the switching bracket (108), the first lug (204) and the second lug (305) through pin shafts.

5. A downhole fishing tool according to claim 2, wherein the second power mechanism (4) comprises two second hydraulic cylinders (401) symmetrically mounted on the second mounting plate (102), the second hydraulic cylinders (401) extending through the second mounting plate (102); the bottom end of the second hydraulic cylinder (401) is connected with the grabbing rod (501), and a stop ring (404) used for limiting the position of the grabbing rod (501) is arranged at the connecting position of the bottom end of the second hydraulic cylinder (401) and the grabbing rod (501); the second mounting plate (102) is further provided with a groove, a clamping ring (402) used for stabilizing the second hydraulic cylinder is mounted in the groove, and the clamping ring (402) is fixed on the second mounting plate (102) through a screw (403).

6. A fishing tool for downhole operations according to claim 1, characterized in that the second gripping mechanism (6) comprises a second telescopic rod (601) and a gripping drill bit (602), the second gripping mechanism (6) being fixedly mounted on the bottom surface of the second mounting plate (102), the gripping drill bit (602) being fixedly connected to the second telescopic rod (601).

7. A fishing tool for downhole operations according to claim 5, characterized in that the bottom end of the housing (1) is provided with a contact plate (118) arranged perpendicular to the side wall of the housing (1), the contact plate (118) is rotatably connected with the housing (1) through a rotating shaft (7); a touch switch (605) for controlling the second grabbing mechanism (6) to start and stop is installed on the inner wall of the shell (1), and a touch device (604) for triggering the touch switch (605) is arranged on the contact plate (118); the touch switch (605) is connected with the second grabbing mechanism (6) through a connecting line (603).

8. A fishing tool for downhole operation according to claim 5, wherein hoisting rings (103) are symmetrically installed on the top end surface of the outer side of the housing (1), and hoisting ropes (104) for hoisting the fishing tool are arranged in the hoisting rings (103); the top end face of the shell (1) is further provided with a controller (105), the controller (105) is connected with a transmission line (106), and the controller (105) is connected with the first hydraulic cylinder (201) through an oil outlet pipe (111); the inside conveyer pipe (112) that are used for transmitting hydraulic oil that still is provided with of shell (1), the bottom of conveyer pipe (112) with second pneumatic cylinder (401) are connected, conveyer pipe (112) top is passed through go out oil pipe (111) with controller (105) are connected.

9. A fishing tool for downhole operations according to claim 7, characterized in that the grab bar (501) is rotatably connected with the housing (1) through the rotating shaft (7), the top of the grab bar (501) is provided with a slot (502), and the baffle ring (404) is slidably mounted in the slot (502); one end, close to a salvage, of the fixed drill rod (503) is provided with a fixed drill bit (506), the fixed drill bit (506) is rotatably connected with the fixed drill rod (503) through a rotating bearing (505), a first sliding groove (5031) is formed in the fixed drill rod (503), the first sliding groove (5031) is installed on the grabbing rod (501) through a first positioning bolt (504), and the first positioning bolt (504) is fixedly arranged on the grabbing rod (501); a second sliding groove (5081) is formed in the driving rod (508), the second sliding groove (5081) is fixed to the grabbing rod (501) through a second positioning bolt (509), and the second positioning bolt (509) is fixedly mounted on the grabbing rod (501); one end of the driving rod (508) close to the salvage is also provided with a sliding curved surface (5082); a barb for hooking the rope cable is arranged on the grapple (513).

10. A fishing tool for downhole operations according to claim 1, wherein the catch (303) is of high manganese steel.