CN212249913U - A coiled tubing heavy-duty hydraulic drop device - Google Patents

Abstract

The utility model discloses a heavy-duty hydraulic hand-throwing device for coiled tubing, which comprises an upper joint, a hand-throwing joint is connected to the lower end of the upper joint, a mandrel and a shearing mandrel are installed in the hand-throwing joint, and the lower end of the shearing mandrel is The peripheral surface is connected with a lower joint through the hand-throwing shear pin, the outer surface of the shearing mandrel is provided with a step surface, and the lower end of the hand-throwing joint is provided with at least one set of spline convex ridges and external threads, and the hand-throwing joint is connected by the spline convex ridge There is a salvage outer cylinder, and the lower end of the salvage outer cylinder is engaged with the first step surface of the lower joint. The stepped surfaces of the outer surface of the cutting mandrel are engaged with each other; the utility model can bear the torsion, stretching, and pressing force with a large bearing capacity, which improves the reliability of the torque transmission of the hand-throwing device; it can be completely realized by the ground pressing operation. The tool is separated and thrown away, and no additional lifting operation is required.

Description

A coiled tubing heavy-duty hydraulic drop device

technical field

The utility model relates to the technical field of downhole operating tools in oil and gas fields, in particular to a heavy-duty hydraulic hand drop device for coiled tubing.

Background technique

In the development of oil and gas wells, it is necessary to run the pipe string for drilling and grinding bridge plugs, workover or other operations such as well flushing. During the operation, the pipe string often encounters operations such as jamming, which cannot be proposed. At this time, in order to ensure that most pipes The column can be taken out, but a part of the tool string must be discarded. The safe throwing device is an indispensable device, which can realize the separation of the column. Since the downhole operation often requires the use of tools such as motors and accelerators, the vibration and impact of the pipe string are very large. At present, most of the products used in production are hydraulic, which cannot withstand relatively large vibration and shock. In addition, during the operation, due to the excitation phenomenon caused by the fluid fluctuation in the pipe string, the tool is easy to be lost halfway, resulting in unnecessary losses.

In addition, the existing hand-throwing device cannot bear the torsion, stretching, and pressing force with a large value under heavy-load hydraulic conditions, and the hand-throwing device is unreliable, which affects the implementation of subsequent operations in the well.

Utility model content

In view of the above-mentioned defects or deficiencies, the purpose of the present utility model is to provide a coiled tubing heavy-duty hydraulic hand-dropping device.

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

A coiled tubing heavy-duty hydraulic hand-dropping device comprises an upper joint installed on a pipe string, a hand-dropping joint is connected to the lower end of the upper joint, and a slidable mandrel and a shearing core are installed in the hand-dropping joint The outer surface of the upper end of the shearing mandrel is gap-fitted with the inner wall of the lower end of the hand-throwing joint. A stepped surface is provided, the lower end of the hand-throwing joint is provided with at least one group of spline convex ridges and external threads, the lower end of the hand-throwing joint is connected with a matching salvage outer cylinder through the spline convex ridge, and the salvage outer tube is The lower end of the barrel is engaged with the first step surface on the outer surface of the lower joint, the hand-throwing joint is sleeved with a lock sleeve through an external thread, a limit sleeve is sleeved on the outer side of the lock sleeve, and the upper end of the limit sleeve is sleeved It is engaged with the lock sleeve, and the lower end of the limit sleeve is engaged with the stepped surface of the outer surface of the shearing mandrel; the steel ball is engaged in the mandrel, and when the wellhead pressurized hydraulic pressure acts on the steel ball, the mandrel is locked. The downward movement drives the shear mandrel to move downward, the shear force overcomes the radial bearing capacity of the dropped shear pin and breaks, the limit sleeve loses the support of the stepped surface of the shear mandrel, and the limit sleeve moves downward; when shearing When the lower end surface of the mandrel is engaged with the second step surface on the inner wall of the lower joint, the limit sleeve is disengaged from the lock sleeve, the lock sleeve is separated from the hand-throwing joint, and the hand-throwing joint is disengaged from the salvage outer cylinder to realize the hand-dropping.

A breakable fixed shear pin is arranged between the salvage outer cylinder and the hand-throwing joint. One end of the fixed shear pin is radially installed on the inner side of the upper end of the salvage outer cylinder, and the other end is engaged with the mounting hole on the periphery of the hand-throwing joint. .

The outer surface of the lock sleeve is axially provided with at least two key grooves, and the limit sleeve is provided with splines matching the key grooves; The outer peripheral surface of the upper end of the limiting sleeve is in contact with the inner wall of the salvaging outer cylinder.

The mandrel is located 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 shear mandrel.

The inner wall of the mandrel is provided with a first inclined stepped surface, the inner diameter of the upper end of the mandrel is larger than the inner diameter of the lower end of the mandrel, and the steel ball is located at the first inclined stepped surface in the mandrel; the outer wall of the mandrel There is a second inclined stepped surface for limiting the position, the outer diameter of the upper end of the mandrel is larger than the outer diameter of the lower end of the mandrel; the inner wall of the hand-throwing joint is provided with a third inclined stepped surface for limiting, the The inner diameter of the upper end of the hand-throwing joint is larger than the inner diameter of the lower end of the hand-throwing joint, and the outer wall of the mandrel is matched with the inner wall of the hand-throwing joint, and has a clearance fit.

The spline ridges are located above the external threads.

The limiting sleeve has a funnel-shaped structure.

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

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

The utility model provides a heavy-duty hydraulic hand-throwing device for coiled tubing. The unique design and assembling structure of a locking sleeve and a limit sleeve are matched with the large-pitch external thread on the hand-throwing joint, so that the tensile strength carried by the hand-throwing device is greatly increased. High; so that the salvage outer cylinder can maintain a stable connection with the drop joint before the wellhead is pressurized, and prevent the salvage outer tube and the drop joint from being separated in advance due to vibration and shock and fluid fluctuations in the pipe string during the operation. , the hand is lost halfway, causing unnecessary losses. In addition, compared with the structure of the existing hand-throwing device that combines the hand-throwing barrel and the hand-loss grasping sleeve, the utility model is simple in structure, easy to operate, safe and reliable, and has the advantages of relatively simple structure. High promotion value; the inner wall of the salvage outer cylinder is provided with a concave keyway that matches the spline convex ridge on the hand-throwing joint, which improves the stable connection between the salvaging outer cylinder and the hand-throwing joint, realizes torque transmission, and can carry a large value. The force of twisting, stretching, and pressing down, to ensure the reliability of the hand-throwing device, and to prevent the loss of hands in the middle of the operation, causing unnecessary losses; through the fixed shears set between the salvage outer cylinder and the hand-dropping joint The pin makes the hand-throwing device further capable of bearing large torsion, stretching, and pressing forces, ensuring the reliability of the hand-throwing device and preventing unnecessary losses from being lost in the middle of the operation.

Description of drawings

Fig. 1 is the structural representation of the device of the present utility model;

Fig. 2 is a schematic diagram of the structure of the hand-dropping joint in Fig. 1;

Fig. 3 is the structural representation of salvaging outer cylinder in Fig. 1;

Fig. 4 is the assembly structure schematic diagram of the hand-dropping joint and the lock sleeve in Fig. 1;

Fig. 5 is the structural representation of the lock sleeve in Fig. 1;

Fig. 6 is the three-dimensional structure schematic diagram of the limiting sleeve in Fig. 1;

FIG. 7 is a schematic cross-sectional structural diagram of the limiting sleeve in FIG. 1 .

In the figure, 1-upper joint, 2-hand-throwing joint, 3-steel ball, 4-mandrel, 5-fixed shear pin, 6-salvage outer cylinder, 7-lock sleeve, 8-limit sleeve, 9-scissor Cutting mandrel, 10-drop-hand shear pin, 11-lower joint, 201-circulation hole, 202-spline convex flute, 203-external thread, 601-female keyway, 701-keyway, 801-spline.

Detailed ways

The present invention will be described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present invention.

Example, as shown in Figures 1-7, a coiled tubing heavy-duty hydraulic hand-dropping device includes an upper joint 1 installed on a pipe string, and a hand-dropping joint 2 is connected to the lower end of the upper joint 1 with an external thread, so A slidable mandrel 4 and a shearing mandrel 9 are installed in the hand-throwing joint 2. The mandrel 4 is located at the lower end of the upper joint 1, and the lower end face of the mandrel 4 is in contact with the upper end face of the shearing mandrel 9. , the outer peripheral surface of the upper end of the shearing mandrel 9 is matched with the inner wall of the lower end of the hand-throwing joint 2, the outer peripheral surface of the shearing mandrel 9 is provided with a stepped surface, and the outer peripheral surface of the lower end of the shearing mandrel 9 The hand shear pin 10 is connected with a lower joint 11. Preferably, a first stepped surface is provided on the outer surface of the lower joint 11, and a second stepped surface for position limitation is provided on the inner wall of the lower joint 11; as shown in FIG. 2 As shown, the lower end of the hand-throwing joint 2 is provided with a plurality of groups of spline ridges 202 and external threads 203 (large pitch external threads), and the pitch of the large-pitch external threads is 4-8mm, and the spline ridges 202 Located above the external thread 203, the lower end of the hand-throwing joint 2 is connected with a matching salvage outer cylinder 6 through the spline convex ridge 202, and the lower end of the salvage outer cylinder 6 is connected with the first step on the outer surface of the lower joint 11. The faces are snapped together, and the hand-throwing joint 2 is provided with a lock sleeve 7 through the external thread 203; as shown in FIG. There are at least two key grooves 701, and a limit sleeve 8 is sleeved on the outer side of the lock sleeve 7. As shown in FIG. 6, the limit sleeve 8 is provided with a spline 801 matching the key groove 701 to prevent The lock sleeve 7 rotates in the limit sleeve 8 to improve the reliability of torque transmission; the limit sleeve 8 has a funnel-shaped structure, the upper end is engaged with the lock sleeve 7, and the lower end is connected to the step on the outer surface of the shearing mandrel 9 The lock sleeves 7 and the limit sleeves 8 are both located on the inner side of the salvage outer cylinder 6, and are used to support the salvage outer cylinder 6 to maintain a stable connection with the hand-throwing joint 2 before the wellhead is pressurized, so as to prevent the Due to the exciting phenomenon caused by vibration shock and fluid fluctuation in the pipe string, the salvage outer cylinder 6 and the hand-loss joint 2 are separated in advance, and the hand is lost in the middle, causing unnecessary losses; Design and assembly structure, the special large-pitch inner thread of the lock sleeve 7 is tightened with the special large-pitch outer thread of the hand-throwing joint 2, and is fixed radially with the limit sleeve 8. Because the special large-pitch thread itself has a very high tensile strength, and is The limit sleeve 8 is fixed to ensure that the lock sleeve 7 is not loose. The concave key groove 701 of the lock sleeve 7 and the convex key groove 801 of the limit sleeve 8 match each other to ensure that the lock sleeve 7 can be completely tightened with the hand-dropping joint. The tensile strength carried by the hand-throwing device is greatly improved, and compared with the existing hand-throwing gripping barrel and hand-throwing gripping sleeve, the structure is simple, easy to operate, safe and reliable, and has high promotion value.

As shown in Figure 3, the inner wall of the salvage outer cylinder 6 is provided with a concave keyway 601 that matches the spline convex ridge 202 on the hand-throwing joint 2, and further, the stable connection between the salvaging outer cylinder 6 and the hand-throwing joint 2 is improved, To achieve torque transmission, it can bear the force of torsion, stretching, and depression with a large value, ensuring the reliability of the hand-dropping device, and preventing unnecessary losses from being dropped in the middle of the operation process.

Further, a circulation hole 201 is provided on the hand-throwing joint 2. Usually, the circulation hole 201 is in a closed state. When the ground pressure reaches the cutting pin 10, the upper end surface of the mandrel 4 moves down to the circulation hole 201. The hydraulic fluid will leak from the circulation hole 201. At this time, there will be a clear pump pressure drop on the ground. It can be judged whether the hand-dropping shear pin 10 is cut and whether the hand-dropping pin 10 is detached; , used to transmit torque.

In the present invention, as shown in FIG. 1 , the steel ball 3 is engaged with the mandrel 4 . When the wellhead pressurized hydraulic pressure acts on the steel ball 3 , the mandrel 4 moves downward to drive the shearing mandrel 9 Moving down, the shearing mandrel 9 moves relatively within the stroke of the lower joint 11 , the shearing force overcomes the radial bearing capacity of the drop-hand shearing pin 10 and breaks, and the shearing mandrel 9 continues under the action of the thrust of the mandrel 4 Move downward, the limit sleeve 8 loses the support of the stepped surface of the shear mandrel 9, and the limit sleeve 8 moves downward. When the shear mandrel 9 moves to the lower end face of the shear mandrel 9 and the inner wall of the lower joint 11 When the second step surface of the limit is engaged, until the limit sleeve 8 is disengaged from the lock sleeve 7, due to the self-split structure, the radial tightening force of the limit sleeve 8 is lost, and the lock sleeve 7 goes around. The dispersing is separated from the hand-throwing joint 2, and the hand-throwing joint 2 is disengaged from the salvage outer cylinder 6 to realize the hand-throwing.

Preferably, as shown in FIG. 1 , a breakable fixed shear pin 5 is provided between the salvaging outer cylinder 6 and the hand-throwing joint 2, which is used to strengthen the stable connection between the salvaging outer cylinder 6 and the hand-throwing joint 2, so that the tool It is not easy to dislocate the loosening agent during the process of going down, which ensures the reliability of the hand-dropping device, and at the same time prevents the hand from being dropped in the middle of the operation process, causing unnecessary losses. One end of the fixed shear pin 5 is radially installed on the inner side of the upper end of the salvage outer cylinder 6, and the other end is engaged with the mounting hole on the periphery of the hand-throwing joint 2; After contacting with the lower joint 11, the lower joint 11 is driven to move downward, and the fixed shear pin 5 is cut off. When the fixed shear pin 5 is broken, the salvage outer cylinder 6 is separated from the hand loss joint 2, and the hand loss is realized. Specifically, when the hand-dropping shear pin 10 is cut off, and at the same time, the limit sleeve 8 loses its support and slides down, it is disengaged from the lock sleeve 7, and the lock sleeve 7 loses its limit due to its own split structure under the action of thrust. The radial tightening force of the sleeve 8 spreads around, the lock sleeve 7 is disengaged from the hand-throwing joint 2, the salvage outer cylinder 6 loses the support of the lock sleeve 7 and the limit sleeve 8, and the inlet hydraulic thrust and the salvage outer cylinder 6 It slides down under the action of its own gravity, so that the fixed shear pin 5 radially bears the shear force of the relative movement of a hand-throwing joint 2 and the salvage outer cylinder 6. When the shear force overcomes the carrying capacity of the fixed shear pin 5, the fixed shear The pin 5 is broken, the salvage outer cylinder 6 is completely disengaged from the hand-throwing joint 2, and the hand-throwing is realized.

Further, as shown in FIG. 1 , the inner wall of the mandrel 4 is provided with a first inclined stepped surface, 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 in the mandrel 4 . The outer wall of the mandrel 4 is provided with a second inclined step surface for limiting, and the outer diameter of the upper end of the mandrel 4 is larger than the outer diameter of the lower end of the mandrel 4; The inner wall of the joint 2 is provided with a third inclined stepped surface for position limit, the inner diameter of the upper end of the hand-throwing joint 2 is larger than the inner diameter of the lower end of the hand-throwing joint 2, and the outer wall of the mandrel 4 matches the inner wall of the hand-throwing joint 2 , and clearance fit. After the loss of the hand is realized, the second inclined stepped surface of the mandrel 4 is engaged with the third inclined stepped surface of the lost-hand joint 2 to prevent the mandrel 4 from falling off and losing.

The working principle of the present utility model:

The steel ball 3 is pumped into the heavy-duty hydraulic throwing hand in the later stage, and is located on the inclined surface of the left end of the mandrel 4. By pressurizing from the wellhead, the mandrel 4 is pushed down and the shearing mandrel 9 is driven to move down. The shearing mandrel 9 moves relatively within the stroke of the lower joint 11, and the shearing force overcomes the radial bearing capacity of the drop-hand shear pin 10 and breaks; when the drop-hand shear pin 10 is cut, the lower joint 11 is separated from the shear mandrel 9, The lower end of the salvage outer cylinder 6 loses the support of the lower joint 11, the shearing mandrel 9 continues to move downward under the action of the thrust of the mandrel 4, the limit sleeve 8 loses the support of the stepped surface of the shearing mandrel 9, and the limit sleeve 8 moves toward Move down; the limit sleeve 8 is disengaged from the lock sleeve 7. Due to the split structure of the lock sleeve 7 itself, the radial tightening force of the limit sleeve 8 is lost, and the lock sleeve 7 spreads out and loses the hand joint 2. At the same time, the salvage outer cylinder 6 loses the support of the lock sleeve 7 and the limit sleeve 8, and the salvage outer cylinder 6 slides downward under the action of the hydraulic thrust at the wellhead and the salvage outer cylinder 6, so that the fixed shear pin 5 radially bears a loss. The shear force of the relative movement of the hand joint 2 and the salvage outer cylinder 6, when the shear force overcomes the bearing capacity of the fixed shear pin 5, the fixed shear pin 5 breaks; when the shear mandrel 9 moves to the lower part of the shear mandrel 9 When the end face is engaged with the second step face on the inner wall of the lower joint 11, the salvage outer cylinder 6 is completely disengaged from the hand-throwing joint 2, thereby realizing hand-throwing. In this process, the tool can be completely separated and thrown away by relying on the ground pressing operation, and no additional lifting operation is required.

For those skilled in the art, it is obvious that the above-mentioned specific embodiments are only the preferred solutions of the present invention. Therefore, the improvements and changes that those skilled in the art may make to certain parts of the present invention still reflect the The principle of the present utility model, the realization of the purpose of the present utility model is still within the scope of protection of the present utility model.

Claims (8)

1. A coiled tubing heavy-duty hydraulic hand-dropping device, characterized in that it comprises an upper joint (1) installed on the pipe string, and the lower end of the upper joint (1) is connected with a hand-dropping joint (2), and the A slidable mandrel (4) and a shearing mandrel (9) are installed in the hand-throwing joint (2), and there is a gap between the outer peripheral surface of the upper end of the shearing mandrel (9) and the inner wall of the lower end of the hand-throwing joint (2) In cooperation, the lower end peripheral surface of the shearing mandrel (9) is connected with a lower joint (11) through the throwing shear pin (10), and the peripheral surface of the shearing mandrel (9) is provided with a stepped surface, and the throwing The lower end of the hand joint (2) is provided with at least one group of spline ridges (202) and external threads (203), and the lower end of the hand-throwing joint (2) is connected with a matching salvage through the spline ridges (202). The outer cylinder (6), the lower end of the salvage outer cylinder (6) is engaged with the first step surface on the outer surface of the lower joint (11), and the hand-throwing joint (2) is sleeved with the outer thread (203) A lock sleeve (7), a limit sleeve (8) is sleeved on the outer side of the lock sleeve (7), the upper end of the limit sleeve (8) is engaged with the lock sleeve (7), and the limit sleeve (8) The lower end of the shear mandrel (9) is engaged with the stepped surface of the outer surface of the shearing mandrel (9); the mandrel (4) is engaged with a steel ball (3), and when the wellhead pressurized hydraulic pressure acts on the steel ball (3), The downward movement of the mandrel (4) drives the shearing mandrel (9) to move downward, the shearing force overcomes the radial bearing capacity of the dropped shear pin (10) and breaks, and the limit sleeve (8) loses the shearing mandrel ( 9) The step surface is supported, and the limit sleeve (8) moves downward; when the lower end surface of the shearing mandrel (9) is engaged with the second step surface on the inner wall of the lower joint (11), the limit sleeve (8) ) is disengaged from the lock sleeve (7), the lock sleeve (7) is separated from the hand-throwing joint (2), and the hand-throwing joint (2) is disengaged from the salvage outer cylinder (6) to realize the hand-throwing. 2. The coiled tubing heavy-duty hydraulic hand-throwing device according to claim 1, wherein a breakable fixed shear pin (5) is provided between the salvage outer cylinder (6) and the hand-throwing joint (2). One end of the fixed shear pin (5) is radially mounted on the inner side of the upper end of the salvage outer cylinder (6), and the other end is engaged with the mounting hole on the periphery of the hand-throwing joint (2). 3. The coiled tubing heavy-duty hydraulic hand-dropping device according to claim 1, characterized in that, at least two key grooves (701) are axially opened on the outer surface of the lock sleeve (7), and the limit sleeve ( 8) A spline (801) that matches the keyway (701) is arranged inside; the lock sleeve (7) and the limit sleeve (8) are both located inside the salvage outer cylinder (6), and the limit sleeve ( 8) The peripheral surface of the upper end is in contact with the inner wall of the fishing outer cylinder (6). 4. The coiled tubing heavy-duty hydraulic hand-throwing 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 shearing The upper end faces of the mandrel (9) are in contact with each other. 5. The coiled tubing heavy-duty hydraulic hand-throwing device according to claim 1, wherein a first inclined stepped surface is provided on the inner wall of the mandrel (4), and 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), the steel ball (3) is located at the first inclined step surface in the mandrel (4); the outer wall of the mandrel (4) is provided with a second inclined Step surface, the outer diameter of the upper end of the mandrel (4) is larger than the outer diameter of the lower end of the mandrel (4); the inner wall of the hand-throwing joint (2) is provided with a third inclined step surface for limiting, the The inner diameter of the upper end of the hand joint (2) is larger than the inner diameter of the lower end of the hand-throwing joint (2). 6 . The coiled tubing heavy-duty hydraulic hand-dropping device according to claim 1 , wherein the spline convex groove ( 202 ) is located above the external thread ( 203 ). 7 . 7 . The coiled tubing heavy-duty hydraulic hand-dropping device according to claim 1 , wherein the limiting sleeve ( 8 ) has a funnel-shaped structure. 8 . 8 . The coiled tubing heavy-duty hydraulic hand dropping device according to claim 1 , wherein the external thread ( 203 ) is a large-pitch external thread, and the large-pitch external thread has a pitch of 4-8 mm. 9 .

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