CN214062901U

CN214062901U - Returnable fishing spear

Info

Publication number: CN214062901U
Application number: CN202022380568.4U
Authority: CN
Inventors: 彭冲; 郑建刚; 李继彪; 王晓飞; 张桓; 刘让龙; 李孟康; 冉旺; 卫胜利; 杨艳丽
Original assignee: Petrochina Co Ltd
Current assignee: Petrochina Co Ltd
Priority date: 2020-10-23
Filing date: 2020-10-23
Publication date: 2021-08-27
Anticipated expiration: 2030-10-23

Abstract

The utility model provides a returnable fishing spear, which comprises an upper joint and a central rod, wherein the lower part of the upper joint is fixedly connected with a centering limit sleeve, the lower part of the centering limit sleeve is connected with a split slip, the upper part of the central rod is arranged in the upper joint, the lower part of the central rod extends out of the split slip, the lower part of the central rod is provided with a cone, and the cone is matched with the split slip; the top of the central rod is limited in the upper joint through a limiting structure, the central rod can move up and down along the shaft, the split slip can move relative to the centering limiting sleeve, and one-way teeth or external threads are machined on the outer side of the lower portion of the split slip. When using this can retreat to drag for the lance and meet the card and need withdraw from, should retreat to drag for the lance and have mechanical rotation and hydraulic pressure two kinds of modes to withdraw from the target salvage thing gradually, realize taking out this instrument whole pit shaft, need not lose and take off partial fitting, overcome current fishing spear and cause fishing tool to stay the well, worsen the problem of the condition in the pit.

Description

Returnable fishing spear

Technical Field

The utility model belongs to the technical field of the oil well separates to adopt bridging plug fishing tool, concretely relates to can move back and drag for lance.

Background

At present, the fishing tool in the pipe falling objects commonly used in the oil field mainly uses slips and a cone as fishing parts, and has two major types of unreleasable fishing spears and withdrawable fishing spears, and occasionally, a scheme that a safety joint is matched with the fishing is provided.

The two schemes of internal fishing tools and safe joint matched fishing have certain defects: 1. the sliding block fishing spear type tool cannot be withdrawn during fishing, and the fishing is possibly complicated in underground condition when being blocked; 2. the common retractable fishing spear (comprising an inverted fishing spear) needs to rotate a pipe column to transmit torque to the fishing spear when being stuck in fishing, and can be withdrawn, so that the fishing spear is not suitable for highly deviated wells, horizontal wells, small-diameter transmission pipes and other situations inconvenient for transmitting torque; 3. when the safety joint type tool is salvaged and is blocked, part of accessories must be lost and can be withdrawn underground, so that the fishing tool is left in the well, and the underground condition is deteriorated.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a can move back and drag for lance, overcome the above-mentioned technical problem who exists among the prior art.

Therefore, the utility model provides a technical scheme as follows:

a returnable fishing spear comprises an upper joint and a central rod, wherein the lower part of the upper joint is fixedly connected with a centering limiting sleeve, the lower part of the centering limiting sleeve is connected with a split slip, the upper part of the central rod is arranged in the upper joint, the lower part of the central rod extends out of the split slip, the lower part of the central rod is provided with a cone, and the cone is matched with the split slip;

the top of the central rod is limited in the upper joint through a limiting structure, the central rod can move up and down along the shaft, the split slip can move relative to the centering limiting sleeve, and one-way teeth or external threads are machined on the outer side of the lower portion of the split slip.

The release piston is arranged in the upper joint, the lower end of the release piston extends into the central rod, the lower part of the release piston is connected with the central rod through a hydraulic pin, a release locking block is fixedly arranged on the central rod, and the release locking block is tightly attached to the release piston;

the inner wall of the lower portion of the upper joint is provided with a first groove, the outer portion of the release locking block is arranged in the first groove, the outer wall of the release piston is provided with a second groove, and the second groove is arranged above the first groove.

The limiting structure comprises a first shoulder and a first inner step, the first inner step is located in the inner cavity of the upper joint, the first shoulder is arranged at the top of the central rod, and the first shoulder is matched with the first inner step.

The outer wall of the upper portion of the split slip is provided with a limiting groove and a second shoulder, the centering limiting sleeve is provided with a second inner step, the second shoulder is matched with the second inner step, the centering limiting sleeve is connected with the split slip through a driving pin, the lower portion of the driving pin is arranged in the limiting groove, and the length of the limiting groove is larger than that of the head of the driving pin.

The outer side of the lower part of the upper joint is connected with the righting limiting sleeve through a bolt.

The outer side of the lower portion of the upper joint is connected with the righting limiting sleeve through a limiting pin, a pit is formed in the outer side of the lower portion of the upper joint, and the limiting pin penetrates through the righting limiting sleeve and extends into the pit.

The utility model has the advantages that:

the utility model provides a can move back and drag for lance drives well core rod through lifting the top connection and shifts up, makes the split slips compress tightly the cone, and the rethread is rotatory along transmission tubular column fastening direction rotary pipe post drive top connection, because salvage one-way tooth (or screw thread) of split slips lower part revolves to the screw thread opposite with the top connection, can withdraw from the target salvage thing gradually through mechanical rotation with the split slips.

This can withdraw and drag for lance under the condition of the transmission moment of torsion of not being convenient for, can drive the top connection through pushing down the tubular column and descend, make the split slips loosen the cone, then under hydraulic action, hydraulic shear pin is cut off, makes the distance increase between top connection and the well core rod, makes the unable cone of contact of split slips, and the one-way tooth (or screw thread) in the split slips outside loses interior the support, carries under the pulling force and adduction at last, will withdraw from in the target salvage gradually.

When using this can move back and drag for the lance and meet the card and need withdraw from, can adopt machinery to rotate or under hydraulic pressure, withdraw from in the target salvage thing gradually, realize taking out this instrument whole pit shaft, need not lose part of accessory, overcome current fishing spear and cause fishing tool to stay the well, worsen the problem of the condition in the pit.

In order to make the above and other objects of the present invention more comprehensible, preferred embodiments accompanied with figures are described in detail below.

Drawings

Fig. 1 is a schematic structural diagram of an embodiment of the present invention;

FIG. 2 is a schematic view of the mechanical rotation exit of the present invention;

fig. 3 is a hydraulic drive exit diagram of the present invention.

In the figure:

description of reference numerals:

1. an upper joint; 2. releasing the piston; 3. a center pole; 4. releasing the locking block; 5. righting the limiting sleeve; 6. a split slip; 7. a cone; 8. a limit pin; 9. a hydraulic pin; 10. a drive pin; 11. a first groove; 12. a second groove; 13. a first inner step; 14. a limiting groove; 15. a first shoulder part; 16. a second shoulder part; 17. a second inner step; 18. and (5) steel balls.

Detailed Description

The following description is provided for illustrative embodiments of the present invention, and other advantages and effects of the present invention will be readily apparent to those skilled in the art from the disclosure herein.

It should be noted that, in the present invention, the upper, lower, left and right in the drawings are regarded as the upper, lower, left and right of the returnable fishing spear described in this specification.

The exemplary embodiments of the present invention will now be described with reference to the accompanying drawings, which, however, may be embodied in many different forms and are not limited to the embodiments described herein, which are provided for complete and complete disclosure of the present invention and to fully convey the scope of the invention to those skilled in the art. The terminology used in the exemplary embodiments presented in the accompanying drawings is not intended to be limiting of the invention. In the drawings, the same units/elements are denoted by the same reference numerals.

Unless otherwise defined, terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Further, it will be understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense.

Example 1:

the embodiment provides a fishing withdrawal spear which comprises an upper connector 1 and a central rod 3, wherein the lower part of the upper connector 1 is fixedly connected with a centering limit sleeve 5, the lower part of the centering limit sleeve 5 is connected with a split slip 6, the upper part of the central rod 3 is arranged in the upper connector 1, the lower part of the central rod 3 extends out of the split slip 6, the lower part of the central rod 3 is provided with a cone 7, and the cone 7 is matched with the split slip 6;

the top of the central rod 3 is limited in the upper joint 1 through a limiting structure, the central rod 3 can move up and down along the shaft, the split slip 6 can move relative to the centering limiting sleeve 5, and one-way teeth or external threads are machined on the outer side of the lower portion of the split slip 6.

The principle of the invention is as follows:

before use, the upper joint 1 is in butt joint with a transmission pipe column through threads. Righting 5 lower parts of stop collar and being connected with split slips 6, right stop collar 5 can restrict split slips 6's axial motion distance, top connection 1 links into an organic whole with righting stop collar 5, because well rod 3 is restricted in top connection 1 by limit structure, consequently when well rod 3 position is fixed, can be along with top connection 1 with right stop collar 5 upward movement, thereby make the cone 7 of well rod 3 lower part upward movement, compress tightly with split slips 6 lower part, again along the opposite direction rotation tubular column of the rotation direction of one-way tooth or external screw thread, make split slips 6 withdraw from the target salvage gradually.

Specifically, this kind of working process of backing out and fishing spear that this embodiment provided is as follows:

when the fishing spear is used for fishing and needs to be withdrawn when a clamp needs to be withdrawn, the upper joint 1 is lifted upwards by the lifting pipe column, the split slips 6 are tightly pressed on the cone 7 and bear small pulling force, the pipe column is rotated along the reverse direction of the rotation direction of the one-way teeth or the external threads, the pipe column drives the upper joint 1 to rotate, the righting limiting sleeve 5 and the split slips 6 synchronously rotate in the same direction, the split slips 6 are gradually withdrawn from a target fishing object, and therefore the tool can be completely taken out of a shaft.

Example 2:

on the basis of the embodiment 1, the embodiment provides a fishing spear, which further comprises a release piston 2, wherein the release piston 2 is arranged in an upper connector 1, the lower end of the release piston 2 extends into a central rod 3, the lower part of the release piston 2 is connected with the central rod 3 through a hydraulic pin 9, a release locking block 4 is fixedly arranged on the central rod 3, and the release locking block 4 is tightly attached to the release piston 2;

the inner wall of the lower portion of the upper connector 1 is provided with a first groove 11, the outer portion of the release locking block 4 is arranged in the first groove 11, the outer wall of the release piston 2 is provided with a second groove 12, and the second groove 12 is arranged above the first groove 11.

As shown in fig. 1, the release piston 2 is positioned in the inner cavity of the upper joint 1, the lower end of the release piston extends into the inner cavity of the central rod 3, the split slips 6 are arranged outside the central rod 3 in a surrounding mode, and the cone 7 is connected to the lower portion of the central rod 3 in a threaded mode; the outer side of the release locking block 4 is sunk into a first groove 11 at the lower part of the inner cavity of the upper joint 1, the main body is positioned on the central rod 3, and the inner side of the release locking block is supported by the release piston 2, so that the upper joint 1 and the central rod 3 are locked into a whole.

In this embodiment, the processing of 1 upper portion inner chamber of top connection has the internal thread to dock with the transmission tubular column, and the internal thread is opposite with the one-way tooth of salvaging (or screw thread) of 6 lower parts of split slips, and the processing of lower part outside has the external screw thread to be connected with righting stop collar 5, and cone 7 threaded connection is in 3 lower parts of well core rod.

The use process comprises the following steps:

mechanical rotation exiting process: under the condition of being convenient for transmit the moment of torsion, salvage when meeting the card and need withdraw from when using this fishing spear of retreating, it drives top connection 1 and goes upward to lift the tubular column, make split slips 6 compress tightly cone 7, and bear less pulling force, along the rotatory tubular column of transmission tubular column fastening direction, the tubular column drives the top connection 1 rotatory, right stop collar 5, split slips 6 is synchronous syntropy rotatory also, because the one-way tooth of salvage or the screw thread handedness of split slips 6 lower part is opposite with top connection 1 screw thread, split slips 6 will withdraw from in the target salvage gradually, thereby can all take out the pit shaft with this instrument. As shown in fig. 2.

Hydraulically driven exit process (as shown in fig. 3): under the condition that the torque is not convenient to transmit, when the fishing spear is used for fishing and needs to be withdrawn when a clamp needs to be withdrawn, the pipe column can be pressed downwards to drive the upper joint 1 to move downwards, the split slip 6 loosens the cone 7 and bears lower pressure, then the steel ball 18 is thrown into the inner cavity of the transmission pipe column to seal the release piston 2, so that the inner cavity of the transmission pipe column is suppressed to be high-pressure, the hydraulic shear pin is sheared under the hydraulic action, the release piston 2 moves downwards, after the inner side of the release locking block 4 enters the second groove 12 of the release piston 2, the release locking block 4 loses the inner support, the pipe column is lifted up under pressure to drive the upper joint 1 to move upwards, at the moment, the release locking block 4 is obliquely extruded and retracted by the lower part of the upper joint 1, the central rod 3 moves downwards until the central rod 3 moves to the maximum, but the split slip 6 is limited by the centering limiting sleeve 5 and cannot contact with the cone 7 at the lower part of the central rod 3, so that the inner support unidirectional teeth (or threads) are lost during fishing, the tool can be withdrawn from the target salvage gradually by retracting under the upward pulling force, so that the tool can be completely taken out of the shaft.

Example 3:

on the basis of embodiment 1 or 2, this embodiment provides an escape spear, limit structure includes shoulder one 15 and interior step one 13, interior step one 13 is located the top connector 1 inner chamber, shoulder one 15 is located the top of well core rod 3, shoulder one 15 and interior step one 13 cooperation.

As shown in fig. 1, when the center rod 3 moves downward, the first shoulder 15 cannot move downward until reaching the maximum stroke after contacting the first shoulder 15 of the first upper joint 1.

Example 4:

on the basis of embodiment 1 or 2, this embodiment provides a fishing spear, the outer wall of split slips 6 upper portion is opened has spacing groove 14 and shoulder two 16, right stop collar 5 and be equipped with interior step two 17, shoulder two 16 and interior step two 17 cooperation, right stop collar 5 and split slips 6 and pass through driving pin 10 and be connected, driving pin 10 lower part is located in spacing groove 14, spacing groove 14 length is greater than driving pin 10's head length.

The split slip 6 is limited in the righting limiting sleeve 5 through the second shoulder 16 and the second inner step 17, and the maximum downward stroke of the split slip 6 is limited; when the upper joint 1 is driven by the lower pressing pipe column to move downwards, the righting limiting sleeve 5 moves downwards along the limiting groove 14, so that the valving slips 6 are not driven to move downwards, and the valving slips 6 are separated from the vertebral body; when the upper joint 1 is driven to move upwards by lifting the pipe column, the central rod 3 moves upwards, after the split slips 6 compress the cone 7, the central rod 3 drives the split slips 6 to move upwards, and the bottom end of the upper joint 1 limits the maximum upward stroke of the split slips 6.

Example 5:

on the basis of embodiment 1 or 2, this embodiment provides an escape spear, and the outside of the lower part of top connection 1 passes through bolted connection with righting stop collar 5.

The upper joint 1 and the righting limit sleeve 5 are connected into a whole through a bolt.

Example 6:

on the basis of embodiment 1 or 2, this embodiment provides a retreat fishing spear, 1 lower part outside of top connection is connected through spacing pin 8 with righting stop collar 5, 1 lower part outside of top connection is equipped with the pit, spacing pin 8 passes and rights in the stop collar 5 stretches into the pit.

Example 7:

on the basis of embodiment 1 or 2, this embodiment provides a retreat fishing spear, as shown in fig. 1, the processing of 1 upper portion inner chamber of top connection has the internal thread to dock with the transmission tubular column, the processing of lower part outside has the external thread to be connected with righting stop collar 5, stop pin 8 passes righting stop collar 5, the bottom stretches into in the pit of 1 lower part outside of top connection, 6 upper portion outsides of split slips are processed and are had spacing groove 14, the lower part outside is processed and is had one-way tooth or the screw thread that matches with the target of salvaging, and opposite with 1 internal thread screw direction of top connection, release piston 2 is located 1 inner chamber of top connection, its lower extreme stretches into well rod 33 inner chamber, split slips 6 ring outside well rod 3, cone 7 threaded connection is in well rod 3 lower parts.

The driving pin 10 penetrates through the righting limiting sleeve 5 to be sunk into the limiting groove 14 in the outer side of the upper portion of the split slip 6, the righting limiting sleeve 5 and the split slip 6 are locked into a whole, through the structure, the upper joint 1, the righting limiting sleeve 5 and the split slip 6 can only rotate synchronously, and a foundation is laid for mechanical rotation and withdrawal fishing.

Righting the biggest down stroke of 5 lower parts of stop collar two 17 limits split slips 6, the biggest upstroke of 1 bottom restriction split slips 6 of top connection, 1 inner chamber lower part processing of top connection is fluted one 11, 3 upper portion windows of well core rod align with this recess one 11, release locking piece 4 outside is absorbed in 1 inner chamber lower part recess one 11 of top connection, release locking piece 4 main part is located 3 upper portion windows of well core rod, inside is supported by release piston 2, thereby with top connection 1, 3 locks of well core rod as an organic whole, through above structure, withdraw from for hydraulic drive and establish the basis.

Mechanical rotation exit process (as shown in fig. 2): under the condition of being convenient for transmit the moment of torsion, salvage when meeting the card and need withdraw from when using this fishing spear of withdrawing, it drives top connection 1 and goes upward to lift the tubular column, make split slips 6 compress tightly cone 7, and bear less pulling force, along the rotatory tubular column of transmission tubular column fastening direction, the tubular column drives top connection 1 rotatory, under the combined action of stop pin 8 and drive pin 10, right stop collar 5, split slips 6 is synchronous syntropy rotatory also, because salvage one-way tooth (or screw thread) of split slips 6 lower part is turned to and is opposite with main screw thread (the internal thread of top connection 1), split slips 6 will be followed the target salvage gradually and withdraw from, thereby can all take out the pit shaft with this instrument.

Hydraulically driven exit process (as shown in fig. 3): under the condition that torque is not convenient to transmit, when the fishing spear is used for fishing and needs to be withdrawn when a clamp needs to be withdrawn, the pipe column can be pressed down to drive the upper joint 1 to move downwards, so that the valving slips 6 loosen the cone 7, and bear smaller pressure, a steel ball 18 is thrown into the inner cavity of the transmission pipe column to block the release piston 2, high pressure is build up from the inner cavity of the transmission pipe column, a hydraulic shear pin is sheared, the release piston 2 descends, the release locking block 4 loses the inner support, the pipe column is lifted up under pressure to drive the upper joint 1 to ascend, the release locking block 4 is obliquely extruded and retracted by a groove I11 in the lower inner cavity of the upper joint 1, the displacement of the central rod 3 and the upper joint 1 is increased, the split slips 6 are limited by a second step 17 in the righting limiting sleeve 5 and cannot contact with the cone 7, and the fishing one-way teeth (or threads) lose the inner support, the tool can be withdrawn from the target salvage gradually by retracting under the upward pulling force, so that the tool can be completely taken out of the shaft.

It will be understood by those skilled in the art that the foregoing embodiments are specific examples of the invention, and that various changes in form and details may be made therein without departing from the spirit and scope of the invention in its practical application.

Claims

1. The utility model provides a can retreat and drag for lance, includes top connection (1) and king-rod (3), its characterized in that: the lower part of the upper joint (1) is fixedly connected with a centering limit sleeve (5), the lower part of the centering limit sleeve (5) is connected with a split slip (6), the upper part of the center rod (3) is arranged in the upper joint (1), the lower part of the center rod (3) extends out of the split slip (6), the lower part of the center rod (3) is provided with a cone (7), and the cone (7) is matched with the split slip (6);

the top of the central rod (3) is limited in the upper joint (1) through a limiting structure, the central rod (3) can move up and down along the shaft, the split slips (6) can move relative to the centering limiting sleeve (5), and one-way teeth or external threads are machined on the outer side of the lower portion of the split slips (6).

2. The returnable fishing spear of claim 1, wherein: the release piston (2) is arranged in the upper joint (1), the lower end of the release piston (2) extends into the central rod (3), the lower part of the release piston (2) is connected with the central rod (3) through a hydraulic pin (9), a release locking block (4) is fixedly arranged on the central rod (3), and the release locking block (4) is tightly attached to the release piston (2);

the inner wall of the lower portion of the upper connector (1) is provided with a first groove (11), the outer portion of the release locking block (4) is arranged in the first groove (11), the outer wall of the release piston (2) is provided with a second groove (12), and the second groove (12) is arranged above the first groove (11).

3. A returnable fishing spear according to claim 1 or 2, characterized in that: the limiting structure comprises a first shoulder (15) and a first inner step (13), the first inner step (13) is located in an inner cavity of the upper joint (1), the first shoulder (15) is arranged at the top of the central rod (3), and the first shoulder (15) is matched with the first inner step (13).

4. A returnable fishing spear according to claim 1 or 2, characterized in that: limiting groove (14) and shoulder two (16) are opened to split slips (6) upper portion outer wall, it is equipped with interior step two (17) to right stop collar (5), shoulder two (16) and interior step two (17) cooperation, it is connected through drive pin (10) with split slips (6) to right stop collar (5), drive pin (10) lower part is located in limiting groove (14), limiting groove (14) length is greater than the head length of drive pin (10).

5. A returnable fishing spear according to claim 1 or 2, characterized in that: the outer side of the lower part of the upper joint (1) is connected with the righting limit sleeve (5) through a bolt.

6. A returnable fishing spear according to claim 1 or 2, characterized in that: the outer side of the lower portion of the upper connector (1) is connected with the centering limiting sleeve (5) through a limiting pin (8), a pit is formed in the outer side of the lower portion of the upper connector (1), and the limiting pin (8) penetrates through the centering limiting sleeve (5) and extends into the pit.

7. A returnable fishing spear according to claim 1 or 2, characterized in that: the upper part of the upper joint (1) is provided with an internal thread, and the rotating direction of the internal thread is opposite to that of a one-way tooth or an external thread processed on the outer side of the lower part of the split slip (6).