CN212249913U - Heavy-load hydraulic releasing device for coiled tubing - Google Patents

Abstract

The utility model discloses a heavy load hydraulic pressure release device for continuous oil pipes, which comprises an upper joint, the lower end of the upper joint is connected with a release joint, a mandrel and a shearing mandrel are installed in the release joint, the lower end peripheral surface of the shearing mandrel is connected with a lower joint through a release shear pin, the shearing mandrel peripheral surface is provided with a step surface, the lower end of the release joint is provided with at least one group of spline convex arris and external threads, the release joint is connected with a salvaging outer cylinder through the spline convex arris, the lower end of the salvaging outer cylinder is clamped with the first step surface of the lower joint, the release joint is sleeved with a lock sleeve through the external threads, the outer side of the lock sleeve is sleeved with a limit sleeve, and the lower end of the limit sleeve is clamped with the step surface; the utility model can bear large torsion, stretching and pressing force, and improves the reliability of torque transmission of the releasing device; the tool can be completely separated and released through ground pressing operation without extra lifting operation.

Description

Heavy-load hydraulic releasing device for coiled tubing

Technical Field

The utility model relates to an oil gas field borehole operation instrument technical field especially relates to a continuous oil pipe heavy load hydraulic pressure releasing device.

Background

When carrying out oil gas well development, need go into the tubular column and bore and grind bridging plug, workover or other operations such as well-flushing, the tubular column meets operations such as card often can appear among the operation process, can't propose, can take out in order to guarantee most tubular columns this moment, must abandon partly instrument pipe cluster, and the safety device of giving up is an indispensable device, can realize the tubular column separation. Because downhole operation often needs tools such as a motor, an accelerator and the like to be matched with each other, the vibration and the impact of a pipe column are very large. Most of the hydraulic release shoes used in the current production can not bear larger shock impact. In addition, in the operation process, the stimulation phenomenon is generated due to the fluctuation of fluid in the pipe column, so that the tool is easy to release halfway, and unnecessary loss is caused.

In addition, the existing releasing device cannot bear large torsion, stretching and pressing force under the condition of heavy-load hydraulic pressure, and the releasing device is unreliable, so that the implementation of follow-up operation in the well is influenced.

SUMMERY OF THE UTILITY MODEL

To above-mentioned defect or not enough, the utility model aims to provide a coiled tubing heavy load hydraulic pressure releasing device.

In order to achieve the above purpose, the technical scheme of the utility model is that:

a heavy-load hydraulic releasing device for a continuous oil pipe comprises an upper connector mounted on a pipe string, wherein the lower end of the upper connector is connected with a releasing connector, a slidable mandrel and a shearing mandrel are mounted in the releasing connector, the upper end peripheral surface of the shearing mandrel is in clearance fit with the lower end inner wall of the releasing connector, the lower end peripheral surface of the shearing mandrel is connected with a lower connector through a releasing shearing pin, a step surface is arranged on the peripheral surface of the shearing mandrel, at least one group of spline flanges and external threads are arranged at the lower end of the releasing connector, the lower end of the releasing connector is connected with a matched salvaging outer cylinder through the spline flanges, the lower end of the salvaging outer cylinder is clamped with a first step surface on the peripheral surface of the lower connector, the releasing connector is sleeved with a lock sleeve through the external threads, the outer side of the lock sleeve is sleeved with a limit sleeve, and the upper end of the limit sleeve is, the lower end of the limiting sleeve is clamped with the step surface of the peripheral surface of the shearing mandrel; the steel ball is clamped in the mandrel, when the pressure of a wellhead pressurized liquid acts on the steel ball, the mandrel moves downwards to drive the shearing mandrel to move downwards, the shearing force overcomes the radial bearing force of the releasing shear pin and is broken, the limiting sleeve loses the support of the step surface of the shearing mandrel, and the limiting sleeve moves downwards; when the lower end face of the shearing mandrel is clamped with the second step face on the inner wall of the lower connector, the limiting sleeve is separated from the lock sleeve, the lock sleeve is separated from the releasing connector, and the releasing connector is separated from the salvaging outer cylinder to realize releasing.

A breakable fixed shear pin is arranged between the salvaging outer cylinder and the releasing joint, one end of the fixed shear pin is radially arranged on the inner side of the upper end of the salvaging outer cylinder, and the other end of the fixed shear pin is clamped with a mounting hole on the periphery of the releasing joint.

At least two key grooves are axially formed in the peripheral surface of the lock sleeve, and splines matched with the key grooves are arranged in the limiting sleeve; the lock sleeve and the limiting sleeve are both positioned on the inner side of the salvaging outer barrel, and the peripheral surface of the upper end of the limiting sleeve is in contact with the inner wall of the salvaging outer barrel.

The mandrel is positioned at the lower end of the upper joint, and the lower end face of the mandrel is in contact with the upper end face of the shearing mandrel.

A first inclined step surface is arranged on the inner wall of the mandrel, the inner diameter of the upper end of the mandrel is larger than that of the lower end of the mandrel, and the steel ball is positioned on the first inclined step surface in the mandrel; a second inclined step surface for limiting is arranged on the outer wall of the mandrel, and the outer diameter of the upper end of the mandrel is larger than that of the lower end of the mandrel; the inner wall of the releasing joint is provided with a third inclined step surface for limiting, the inner diameter of the upper end of the releasing joint is larger than that of the lower end of the releasing joint, and the outer wall of the mandrel is matched with the inner wall of the releasing joint and is in clearance fit with the inner wall of the releasing joint.

The spline flange is positioned above the external thread.

The stop collar is funnel-shaped structure.

The external thread is a coarse-pitch external thread, and the pitch of the coarse-pitch external thread is 4-8 mm.

Compared with the prior art, the beneficial effects of the utility model are that:

the utility model provides a heavy-load hydraulic releasing device for a continuous oil pipe, which is matched with a large-pitch external thread on a releasing joint through the unique design and the assembly structure of a lock sleeve and a stop collar, so that the tensile strength borne by the releasing device is greatly high; so that the salvaging outer cylinder keeps stable connection with the releasing joint before the well head is pressurized, and the salvaging outer cylinder is separated from the releasing joint in advance due to the excitation phenomenon generated by vibration impact and fluid fluctuation in the pipe column in the operation process, and is released midway to cause unnecessary loss; the inner wall of the salvaging outer cylinder is provided with the concave key groove matched with the convex edge of the spline on the releasing joint, so that the stable connection between the salvaging outer cylinder and the releasing joint is improved, the torque transmission is realized, the torsion, the stretching and the pressing force with large bearing capacity can be borne, the reliability of the releasing device is ensured, and meanwhile, unnecessary loss caused by midway releasing in the operation process is prevented; through salvaging the fixed shear pin that sets up between urceolus and the joint of giving up for the device of giving up further can bear the torsion that the bearing capacity is big, tensile, and the strength of pushing down, guarantee the reliability of device of giving up, prevent simultaneously that the operation in-process from giving up midway, causing the unnecessary loss.

Drawings

FIG. 1 is a schematic view of the structure of the device of the present invention;

FIG. 2 is a schematic view of the coupling arrangement of FIG. 1;

FIG. 3 is a schematic structural view of the fishing outer barrel in FIG. 1;

FIG. 4 is a schematic view of the assembly of the release sub and lock sleeve of FIG. 1;

FIG. 5 is a schematic structural view of the jacket of FIG. 1;

FIG. 6 is a schematic perspective view of the stop collar of FIG. 1;

fig. 7 is a schematic sectional structure view of the stop collar in fig. 1.

In the figure, 1-upper joint, 2-releasing joint, 3-steel ball, 4-mandrel, 5-fixed shear pin, 6-salvaging outer cylinder, 7-lock sleeve, 8-limit sleeve, 9-shear mandrel, 10-releasing shear pin, 11-lower joint, 201-circulation hole, 202 spline flange, 203-external thread, 601-concave key groove, 701-key groove and 801-spline.

Detailed Description

The present invention will be described in detail with reference to the drawings, and it should be understood that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In the embodiment, as shown in fig. 1 to 7, a heavy-load hydraulic releasing device for a coiled tubing comprises an upper joint 1 mounted on a tubing string, wherein a releasing joint 2 is connected to the lower end of the upper joint 1 through external threads, a slidable mandrel 4 and a shearing mandrel 9 are mounted in the releasing joint 2, the mandrel 4 is located at the lower end of the upper joint 1, the lower end surface of the mandrel 4 is in contact with the upper end surface of the shearing mandrel 9, the upper end peripheral surface of the shearing mandrel 9 is in clearance fit with the inner wall of the lower end of the releasing joint 2, the peripheral surface of the shearing mandrel 9 is provided with a step surface, the lower end peripheral surface of the shearing mandrel 9 is connected with a lower joint 11 through a releasing shear pin 10, preferably, the peripheral surface of the lower joint 11 is provided with a first step surface, and the inner wall of the lower joint 11 is provided with a second step surface for limiting; as shown in fig. 2, the lower end of the releasing connector 2 is provided with a plurality of groups of spline ridges 202 and external threads 203 (large-pitch external threads), the pitch of the large-pitch external threads is 4-8 mm, the spline ridges 202 are positioned above the external threads 203, the lower end of the releasing connector 2 is connected with a matched salvaging outer cylinder 6 through the spline ridges 202, the lower end of the salvaging outer cylinder 6 is clamped with a first step surface on the peripheral surface of the lower connector 11, and the releasing connector 2 is sleeved with a lock sleeve 7 through the external threads 203; as shown in fig. 5, the lock sleeve 7 is a split lock sleeve, at least two key slots 701 are axially formed in the peripheral surface of the lock sleeve 7, a limiting sleeve 8 is sleeved on the outer side of the lock sleeve 7, and as shown in fig. 6, a spline 801 matched with the key slots 701 is arranged in the limiting sleeve 8 and used for preventing the lock sleeve 7 from rotating in the limiting sleeve 8 so as to improve the reliability of torque transmission; the limiting sleeve 8 is of a funnel-shaped structure, the upper end of the limiting sleeve is clamped with the lock sleeve 7, the lower end of the limiting sleeve is clamped with the step surface of the peripheral surface of the shearing mandrel 9, the lock sleeve 7 and the limiting sleeve 8 are both positioned on the inner side of the salvaging outer cylinder 6 and are used for supporting the salvaging outer cylinder 6 to be stably connected with the releasing connector 2 before wellhead pressurization, and the salvaging outer cylinder 6 is separated from the releasing connector 2 in advance and is released midway to cause unnecessary loss due to excitation phenomena generated by vibration impact and fluid fluctuation in a pipe column in the operation process; meanwhile, due to the unique design and assembly structure of the lock sleeve 7 and the limiting sleeve 8, the special large-pitch internal thread of the lock sleeve 7 is matched and screwed with the special large-pitch external thread of the releasing connector 2 and is radially fixed by the limiting sleeve 8, and the special large-pitch internal thread is very high in tensile strength and is fixed by the limiting sleeve 8, so that the lock sleeve 7 is guaranteed not to be loosened. The concave key groove 701 of the lock sleeve 7 is matched with the convex key groove 801 of the limiting sleeve 8, so that the lock sleeve 7 can be completely screwed with the releasing connector. The tensile strength borne by the releasing device is greatly improved, and compared with the existing releasing grab barrel and releasing grab sleeve, the releasing device is simple in structure, easy to operate, safe and reliable, and has high popularization value.

As shown in fig. 3, the inner wall of the salvaging outer cylinder 6 is provided with a concave key groove 601 matched with the spline convex edge 202 on the releasing joint 2, further, the stable connection between the salvaging outer cylinder 6 and the releasing joint 2 is improved, torque transmission is realized, torsion, tension and pressing force with large bearing capacity can be borne, the reliability of the releasing device is ensured, and meanwhile, unnecessary loss caused by midway releasing in the operation process is prevented.

Furthermore, the release sub 2 is provided with a circulation hole 201, the circulation hole 201 is usually in a closed state, when the ground pressure reaches to cut the release shear pin 10, the upper end surface of the mandrel 4 moves downwards to the circulation hole 201, the hydraulic fluid can leak from the circulation hole 201, at the moment, clear pump pressure drops on the ground, and whether the release shear pin 10 is cut off or not and whether the safety release is disengaged or not can be judged; the lower end of the releasing sub 2 is provided with a plurality of groups of spline flanges 202 for transmitting torque.

In the utility model, as shown in figure 1, a steel ball 3 is clamped in the mandrel 4, when the pressure of the wellhead pressurized liquid acts on the steel ball 3, the mandrel 4 moves downwards to drive the shearing mandrel 9 to move downwards, the shearing mandrel 9 moves relatively in the stroke of the lower joint 11, the shearing force overcomes the radial bearing force of the releasing shear pin 10 and is broken, the shearing mandrel 9 continues to move downwards under the action of the thrust of the mandrel 4, the limiting sleeve 8 loses the support of the step surface of the shearing mandrel 9, the limiting sleeve 8 moves downwards, when the shearing mandrel 9 moves to the position that the lower end surface of the shearing mandrel 9 is clamped with the second step surface used for limiting on the inner wall of the lower joint 11, until the limiting sleeve 8 is separated from the lock sleeve 7, because of the split structure, the radial tightening external force of the stop collar 8 is lost, the lock sleeve 7 is dispersed to the periphery to be separated from the releasing joint 2, and the releasing joint 2 is separated from the salvaging outer barrel 6 to realize releasing.

Preferably, as shown in fig. 1, a breakable fixed shear pin 5 is arranged between the salvaging outer cylinder 6 and the releasing sub 2, and is used for strengthening the stable connection between the salvaging outer cylinder 6 and the releasing sub 2, so that the tool is not easy to loose the agent to be misplaced in the process of going down the well, the reliability of the releasing device is ensured, and meanwhile, unnecessary loss caused by midway releasing in the operation process is prevented. One end of the fixed shear pin 5 is radially arranged on the inner side of the upper end of the salvaging outer cylinder 6, and the other end of the fixed shear pin is clamped with a mounting hole on the periphery of the releasing joint 2; after the releasing joint shear pin 10 is sheared, the right end face of the shearing mandrel 9 is in contact with the lower joint 11 to drive the lower joint 11 to move downwards continuously to shear the fixed shear pin 5, and when the fixed shear pin 5 is broken, the salvaging outer cylinder 6 is separated from the releasing joint 2, so that releasing is realized. Specifically, when the releasing shear pin 10 is cut off, the stop collar 8 loses support and slides down, the lock collar 7 is separated, the lock collar 7 is under the action of thrust, due to the split structure of the lock collar, the radial tightening external force of the stop collar 8 is lost, the lock collar 7 is separated from the releasing joint 2, the salvaging outer barrel 6 loses the support of the lock collar 7 and the stop collar 8, the lock collar slides downwards under the action of inlet hydraulic thrust and the self gravity of the salvaging outer barrel 6, the fixed shear pin 5 radially bears the shearing force of relative motion of the releasing joint 2 and the salvaging outer barrel 6, when the shearing force overcomes the bearing capacity of the fixed shear pin 5, the fixed shear pin 5 is broken, the salvaging outer barrel 6 is completely separated from the releasing joint 2, and releasing is realized.

Further, as shown in fig. 1, a first inclined step surface is arranged on the inner wall of the mandrel 4, the inner diameter of the upper end of the mandrel 4 is larger than the inner diameter of the lower end of the mandrel 4, and the steel ball 3 is located at the first inclined step surface in the mandrel 4; a second inclined step surface for limiting is arranged on the outer wall of the mandrel 4, and the outer diameter of the upper end of the mandrel 4 is larger than that of the lower end of the mandrel 4; the inner wall of the releasing joint 2 is provided with a third inclined step surface for limiting, the inner diameter of the upper end of the releasing joint 2 is larger than that of the lower end of the releasing joint 2, and the outer wall of the mandrel 4 is matched with the inner wall of the releasing joint 2 in a clearance fit mode. After releasing is achieved, the second inclined step surface of the mandrel 4 is clamped and fixed with the third inclined step surface of the releasing joint 2, and the mandrel 4 is prevented from falling off and losing.

The utility model discloses a theory of operation:

the steel ball 3 is pumped into a heavy-load hydraulic releasing pin through a later-stage pump, is located on the inclined plane at the left end of the mandrel 4, pushes the mandrel 4 to move downwards and drives the shearing mandrel 9 to move downwards through pressurization from a wellhead, the shearing mandrel 9 moves relatively in the stroke of the lower joint 11, and the shearing force overcomes the radial bearing force of the releasing shear pin 10 and breaks; when the releasing shear pin 10 is sheared, the lower joint 11 is separated from the shearing mandrel 9, the lower end of the salvaging outer cylinder 6 loses the support of the lower joint 11, the shearing mandrel 9 continues to move downwards under the action of the thrust of the mandrel 4, the limiting sleeve 8 loses the support of the step surface of the shearing mandrel 9, and the limiting sleeve 8 moves downwards; the limiting sleeve 8 is disengaged from the lock sleeve 7, due to the split structure of the lock sleeve 7, the radial tightening external force of the limiting sleeve 8 is lost, the lock sleeve 7 is scattered towards the periphery and separated from the releasing connector 2, meanwhile, the salvaging outer cylinder 6 loses the support of the lock sleeve 7 and the limiting sleeve 8, and the salvaging outer cylinder 6 slides downwards under the action of wellhead hydraulic thrust and the salvaging outer cylinder 6, so that the fixed shear pin 5 radially bears the shearing force of relative movement of the releasing connector 2 and the salvaging outer cylinder 6, and when the shearing force overcomes the bearing capacity of the fixed shear pin 5, the fixed shear pin 5 is broken; when the shearing mandrel 9 moves to the position that the lower end face of the shearing mandrel 9 is clamped with the second step face on the inner wall of the lower connector 11, the salvaging outer cylinder 6 is thoroughly separated from the releasing connector 2, and releasing is realized. The process can completely realize tool separation and releasing by means of ground pressing operation without additional lifting operation.

It should be apparent to those skilled in the art that the above embodiments are only preferred embodiments of the present invention, and therefore, the modifications and changes that can be made by those skilled in the art to some parts of the present invention still embody the principles of the present invention, and the objects of the present invention are achieved, all falling within the scope of the present invention.

Claims (8)

1. The heavy-load hydraulic releasing device for the coiled tubing is characterized by comprising an upper joint (1) arranged on a tubing string, wherein the lower end of the upper joint (1) is connected with a releasing joint (2), a slidable mandrel (4) and a shearing mandrel (9) are arranged in the releasing joint (2), the upper end peripheral surface of the shearing mandrel (9) is in clearance fit with the lower end inner wall of the releasing joint (2), the lower end peripheral surface of the shearing mandrel (9) is connected with a lower joint (11) through a releasing shear pin (10), the peripheral surface of the shearing mandrel (9) is provided with a step surface, the lower end of the releasing joint (2) is provided with at least one group of spline convex ribs (202) and external threads (203), the lower end of the releasing joint (2) is connected with a matched fishing outer cylinder (6) through the spline convex ribs (202), and the lower end of the fishing outer cylinder (6) is clamped with a first step surface on the peripheral surface of the lower joint (11), the releasing joint (2) is sleeved with a lock sleeve (7) through an external thread (203), the outer side of the lock sleeve (7) is sleeved with a limiting sleeve (8), the upper end of the limiting sleeve (8) is clamped with the lock sleeve (7), and the lower end of the limiting sleeve (8) is clamped with a step surface on the peripheral surface of the shearing mandrel (9); the steel ball (3) is clamped in the mandrel (4), when wellhead pressurizing hydraulic pressure acts on the steel ball (3), the mandrel (4) moves downwards to drive the shearing mandrel (9) to move downwards, the shearing force overcomes the radial bearing force of the releasing shear pin (10) and is broken, the limiting sleeve (8) loses the support of the step surface of the shearing mandrel (9), and the limiting sleeve (8) moves downwards; when the lower end face of the shearing mandrel (9) is clamped with the second step face on the inner wall of the lower joint (11), the limiting sleeve (8) is separated from the lock sleeve (7), the lock sleeve (7) is separated from the releasing joint (2), and the releasing joint (2) is separated from the salvaging outer cylinder (6) to realize releasing.

2. The coiled tubing heavy-load hydraulic releasing device as claimed in claim 1, wherein a breakable fixed shear pin (5) is arranged between the salvaging outer cylinder (6) and the releasing joint (2), one end of the fixed shear pin (5) is radially arranged on the inner side of the upper end of the salvaging outer cylinder (6), and the other end of the fixed shear pin is clamped with a mounting hole on the periphery of the releasing joint (2).

3. The coiled tubing heavy-load hydraulic releasing device as recited in claim 1, wherein at least two key grooves (701) are axially formed in the peripheral surface of the lock sleeve (7), and a spline (801) matched with the key grooves (701) is arranged in the limiting sleeve (8); the lock sleeve (7) and the limiting sleeve (8) are both positioned on the inner side of the salvaging outer cylinder (6), and the peripheral surface of the upper end of the limiting sleeve (8) is in contact with the inner wall of the salvaging outer cylinder (6).

4. The coiled tubing heavy-load hydraulic releasing device according to claim 1, wherein the mandrel (4) is located at the lower end of the upper joint (1), and the lower end surface of the mandrel (4) is in contact with the upper end surface of the shearing mandrel (9).

5. The coiled tubing heavy-load hydraulic releasing device as recited in claim 1, wherein a first inclined step surface is arranged on the inner wall of the mandrel (4), the inner diameter of the upper end of the mandrel (4) is larger than that of the lower end of the mandrel (4), and the steel ball (3) is positioned at the first inclined step surface in the mandrel (4); a second inclined step surface for limiting is arranged on the outer wall of the mandrel (4), and the outer diameter of the upper end of the mandrel (4) is larger than that of the lower end of the mandrel (4); the inner wall of the releasing joint (2) is provided with a third inclined step surface for limiting, the inner diameter of the upper end of the releasing joint (2) is larger than that of the lower end of the releasing joint (2), and the outer wall of the mandrel (4) is matched with the inner wall of the releasing joint (2) in a clearance fit mode.

6. The coiled tubing heavy-duty hydraulic release device of claim 1, wherein the spline ridge (202) is located above the external thread (203).

7. The coiled tubing heavy-load hydraulic releasing device as claimed in claim 1, wherein the stop collar (8) is of a funnel-shaped structure.

8. The coiled tubing heavy-duty hydraulic release device of claim 1, wherein the external thread (203) is a high-pitch external thread having a pitch of 4-8 mm.

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