A coiled tubing sheath mill cutting and fishing integrated fishing barrel

Abstract

The application discloses a coiled tubing sleeve-milling cutting and fishing integrated fishing barrel, which comprises a barrel body and an upper joint arranged coaxially, the upper joint is detachably connected to one end of the barrel body, a cutter assembly, a cutter pushing ring and a flaky combined slip assembly are sequentially arranged in the barrel body along the direction close to the upper joint, the flaky combined slip assembly comprises a slip sleeve and a plurality of flaky slips, the slip sleeve is movably arranged in the barrel body, the tail portions of the plurality of flaky slips are connected by a ring-shaped spring sheet into a hollow truncated cone-shaped slip, the opening of the truncated cone-shaped slip gradually increases along the direction away from the ring-shaped spring sheet, the truncated cone-shaped slip is movably arranged in the slip sleeve, a conical surface is arranged on the inner wall of the slip sleeve between the truncated cone-shaped slip and the cutter pushing ring, and the opening of the slip sleeve at the conical surface gradually decreases along the direction away from the flaky slip; the slip is designed in a flaky manner, is assembled by being gathered by the ring-shaped spring sheet, the clamping force during fish passing is reduced, the degree of abrasion is reduced, and the service life of the flaky slip is prolonged.

Description

A continuous tubing sleeve milling, cutting, and retrieval integrated retrieval cylinder Technical Field

[0001] This invention relates to the field of tubing retrieval technology, specifically to an integrated retrieval cylinder for continuous tubing milling, cutting, and retrieval. Background Technology

[0002] As an essential tool in oil, gas and water well workover operations, fishing tools play an important role in well workover operations and are commonly used for retrieving fish that have fallen into coiled tubing, pipes, rods and other similar equipment during accidents.

[0003] However, existing salvage tools have the following drawbacks:

[0004] 1. Milling is not allowed. When milling rotating tools, the internal jaws will wear out, resulting in loss of the salvage function.

[0005] 2. The cutter has low strength and is prone to breakage during cutting operations;

[0006] 3. The slip sleeve has a pin. After the pin is sheared, it deforms and affects rotation, resulting in a large operating torque. Summary of the Invention

[0007] The purpose of this invention is to overcome the shortcomings of the prior art and provide an integrated continuous tubing milling, cutting, and retrieval cylinder to solve the problems mentioned in the background art.

[0008] The objective of this invention is achieved through the following technical solution: a continuous tubing milling, cutting, and retrieval integrated retrieval cylinder, comprising a coaxially arranged cylinder body and an upper connector, the upper connector being detachably connected to one end of the cylinder body. Inside the cylinder body, along the direction close to the upper connector, a cutter assembly, a pusher ring, and a plate-shaped combined slip assembly are sequentially arranged. The plate-shaped combined slip assembly includes a slip sleeve and multiple plate-shaped slips. The slip sleeve is movably disposed within the cylinder body. The tails of the multiple plate-shaped slips are connected by annular spring plates to form hollow frustum-shaped slips. The opening of the frustum-shaped slips gradually increases in the direction away from the annular spring plates. The frustum-shaped slips are movably disposed within the slip sleeve. The inner wall of the slip sleeve has a conical surface between the frustum-shaped slips and the pusher ring. The opening of the slip sleeve at the conical surface gradually decreases in the direction away from the plate-shaped slips.

[0009] The pusher ring is connected to the cylinder by a pin;

[0010] The cutter assembly includes two cutters, which are symmetrically arranged along the axis of the cylinder. The end of each cutter away from the pusher ring is hinged to the cylinder, and the axis of rotation of the cutter is perpendicular to the axis of the cylinder.

[0011] In some embodiments, the inner wall of the sheet-like latch is uniformly provided with a plurality of latch teeth along its own length.

[0012] In some embodiments, the inner wall of the tail of the plate-shaped latch is provided with a spring piece, the spring piece being in the shape of an inverted "V". One end of the spring piece is connected to the plate-shaped latch by a screw, and the other end is in contact with the plate-shaped latch.

[0013] In some embodiments, a pin is rotatably passed through one end of the cutter away from the pusher ring, the pin is fixedly connected to the cylinder, and a torsion spring is sleeved on the pin, the torsion spring being located between the cutter and the pin.

[0014] In some embodiments, the distance between the two cutters gradually decreases in the direction close to the pusher ring, and a guide slope is provided on the outer wall of the cutter near the pusher ring. A pusher gap is formed between the guide slope and the inner wall of the cylinder for the pusher ring to be inserted.

[0015] In some embodiments, the outer wall of the cylinder has a stepped hole along its own radial direction, the stepped hole is connected to the inner cavity of the cylinder, the outer wall of the pusher ring has a circular groove, and the pin is adapted to both the stepped hole and the circular groove.

[0016] In some embodiments, the stepped hole is provided with a large-diameter hole and a small-diameter hole in sequence along the direction close to the circular groove. The pin is slidably adapted to the small-diameter hole, and a limiting plate is slidably adapted to the large-diameter hole. The limiting plate is fixedly sleeved on the pin, and a spring is sleeved on the pin. One end of the spring is connected to the step formed by the large-diameter hole and the small-diameter hole, and the other end of the spring contacts the limiting plate.

[0017] In some embodiments, a magnet is provided in the circular groove, the magnet attracts the pin, causing the spring to be in a compressed state, and under the force of the spring, a gap is formed between the pin and the magnet.

[0018] In some embodiments, a hollow external threaded tube is fixed to one end of the upper connector, and an internal thread is provided at one end of the cylinder. The hollow external threaded tube is threaded to the upper connector.

[0019] In some embodiments, the cutter is made of alloy steel.

[0020] The beneficial effects of this invention are:

[0021] 1. The slip-shaped design is assembled by converging ring-shaped spring plates, which reduces the clamping force during the fish's passage, thereby reducing wear and extending the service life of the slip-shaped slip.

[0022] 2. The frustum-shaped slip and slip sleeve, as well as the slip sleeve and cylinder, are freely positioned without restriction, reducing friction between them and achieving free rotation. This ensures that the rotating column does not wear the slip teeth during milling and cutting.

[0023] 3. The limiting pin is placed at the pusher ring position, which avoids the problem of increased rotational torque caused by the shearing deformation of the limiting pin of the slip sleeve in the past.

[0024] 4. The cutter is made of alloy steel, which increases its strength, and a torsion spring is added to realize the reset function. Attached Figure Description

[0025] Figure 1 is a schematic diagram of the internal structure of a continuous tubing milling, cutting and salvage integrated salvage cylinder according to the present invention.

[0026] Figure 2 is an enlarged view of point A in Figure 1;

[0027] Figure 3 is an enlarged view of point B in Figure 1;

[0028] Figure 4 is an enlarged view of point C in Figure 1;

[0029] In the diagram, 1-cylinder body, 2-upper connector, 3-push blade ring, 4-slip sleeve, 5-plate slip, 6-pin, 7-ring spring plate, 8-cutter, 9-slip tooth, 10-conical surface, 11-spring plate, 12-pin, 13-torsion spring, 14-guide slope, 15-circular groove, 16-large diameter hole, 17-small diameter hole, 18-limiting plate, 19-spring, 20-magnet, 21-hollow external threaded tube. Detailed Implementation

[0030] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings, but the scope of protection of the present invention is not limited to the following description.

[0031] As shown in Figures 1 to 4, a continuous tubing milling, cutting, and retrieval integrated retrieval cylinder includes a coaxially arranged cylinder body 1 and an upper connector 2. The upper connector 2 is detachably connected to one end of the cylinder body 1. Specifically, a hollow externally threaded pipe 21 is fixed to one end of the upper connector 2, and an internal thread is provided at one end of the cylinder body 1. The hollow externally threaded pipe 21 is threadedly matched with the upper connector 2. The upper connector 2 and the cylinder body 1 are connected by threads, realizing a detachable connection between the cylinder body 1 and the upper connector 2, which facilitates installation and disassembly. Inside the cylinder body 1, along the direction close to the upper connector 2, a cutter assembly, a pusher ring 3, and a plate-shaped combined slip assembly are arranged sequentially. The plate-shaped combined slip assembly includes a slip sleeve 4 and multiple plate-shaped slips 5. The slip sleeve 4 is movable. The coiled tubing is movably mounted inside the cylinder 1. Multiple plate-shaped slips 5 are connected at their tails by annular spring plates 7 to form hollow frustum-shaped slips. The opening of the frustum-shaped slips gradually increases in the direction away from the annular spring plates 7. The inner wall of each plate-shaped slip 5 is evenly provided with several slip teeth 9 along its length. This reduces the clamping force of the frustum-shaped slips during the insertion of the tubing, thereby reducing wear on the slip teeth 9 and extending the service life of the plate-shaped slips 5. The slip teeth 9 are hardened, giving them a strength higher than the tubing body, further reducing wear. The frustum-shaped slips are movably mounted inside a slip sleeve 4, with the inner wall of the slip sleeve 4 located between the frustum-shaped slips and the pusher ring 3. A conical surface 10 is provided. The opening of the slip sleeve 4 at the conical surface 10 gradually decreases in the direction away from the plate-shaped slip 5. When the complete plate-shaped combined slip assembly wraps around the fish, it can effectively grab the fish. Under the interaction between the outer conical surface of the plate-shaped slip 5 and the slip sleeve 4, the plate-shaped slip 5 deforms close to the axis of the cylinder 1, causing the frustum-shaped slip to converge, thereby making the continuous tubing continuously stressed and achieving the purpose of grabbing the fish. The pusher ring 3 is connected to the cylinder 1 by a pin 6. The cutter assembly includes two cutters 8, which are symmetrically arranged along the axis of the cylinder 1. The end of the cutter 8 away from the pusher ring 3 is hinged to the cylinder 1. The rotation axis of the cutter 8 is perpendicular to the axis of the cylinder 1. When the fish falls... When the fish becomes severely stuck and retrieval is impossible, a cutting operation will be performed. During the lifting of the tubing string, the fish is held by the plate-shaped combined slip assembly. During the lifting process, the plate-shaped combined slip assembly exerts downward force to press against the pusher ring 3. When the pusher ring 3 cuts the pin 6, it indicates that the fish cannot be retrieved, and a cutting operation is immediately performed. The tubing string is then used to lift the cylinder 1, causing the pusher ring 3 to press against the cutting blade 8, causing the cutting blade 8 to deflect and cut the tubular fish. The tubing string then drives the cylinder 1 to rotate. Because the plate-shaped combined slip assembly is movably positioned inside the cylinder 1 and tightly holds the tubular fish, it does not rotate with the cylinder 1. This allows the cutting blade 8 to rotate and achieve a circular cut, effectively severing the tubular fish. Preferably, the cutting blade 8 is made of alloy steel, which has high strength and can effectively cut the tubular fish.

[0032] In some embodiments, as shown in Figures 1 and 2, a spring plate 11 is provided on the inner wall of the tail of the plate-shaped slip 5. The spring plate 11 is in the shape of an inverted "V". One end of the spring plate 11 is connected to the plate-shaped slip 5 by a screw, and the other end is in contact with the plate-shaped slip 5. After the fishing string (fish) enters the interior of the frustum-shaped slip, the spring plate 11 will be subjected to an upward frictional force. This frictional force will cause the spring plate 11 to be stressed, thereby driving the upper part of the plate-shaped slip to be stressed inward, thereby causing the lower teeth of the plate-shaped slip 5 to expand, reducing the contact between the fishing teeth and the fishing string, and reducing wear.

[0033] In some embodiments, as shown in Figures 1 and 3, a pin 12 is rotatably inserted at the end of the cutter 8 away from the pusher ring 3. The pin 12 is fixedly connected to the cylinder 1. A torsion spring 13 is sleeved on the pin 12, located between the cutter 8 and the pin 12. The distance between the two cutters 8 gradually decreases in the direction close to the pusher ring 3. A guide slope 14 is formed on the outer wall of the cutter 8 near the pusher ring 3, and a space is formed between the guide slope 14 and the inner wall of the cylinder 1 for the pusher ring 3 to be inserted. When the pin 6 is cut off, the plate-shaped combined slip assembly moves downward relative to the cylinder 1 when the tube column is lifted, thereby pushing the pusher ring 3 closer to the cutter 8, so that the pusher ring 3 is inserted into the pusher gap and squeezes the guide slope 14, thereby driving the cutter 8 to deflect closer to the tubular fish dropper to cut the tubular fish dropper. After the cutting is completed and the cut upper dropper fish is removed, the pusher ring 3 and the plate-shaped combined slip assembly are reset, and the cutter 8 is reset under the force of the torsion spring 13.

[0034] In some embodiments, as shown in Figures 1 and 4, a stepped hole is formed on the outer wall of the cylinder 1 along its radial direction, and the stepped hole connects to the inner cavity of the cylinder 1. A circular groove 15 is formed on the outer wall of the pusher ring 3. The pin 6 is adapted to both the stepped hole and the circular groove 15. A large-diameter hole 16 and a small-diameter hole 17 are formed sequentially in the stepped hole along the direction close to the circular groove 15. The pin 6 is slidably adapted to the small-diameter hole 17. A limiting plate 18 is slidably adapted to the large-diameter hole 16. The limiting plate 18 is fixedly sleeved on the pin 6. A spring 19 is sleeved on the pin 6. One end of the spring 19 is connected to the step formed by the large-diameter hole 16 and the small-diameter hole 17. The other end of the spring 19 contacts the limiting plate 18. A magnet 20 is provided in the circular groove 15. The magnet 20 attracts the pin 6, causing the spring 19 to be in a compressed state. Under the force of the spring 19, a gap is formed between the pin 6 and the magnet 20. The pin 6 is attracted by the magnet 20, causing the pin 6 to partially insert into the circular groove 15 by compressing the spring 19. The movement distance of the pin 6 is limited by the limiting plate 18 to prevent the pin 6 from contacting the magnet 20. The compression spring 19 and the limiting plate 18 create a gap between the magnet 20 and the pin 6, maintaining the stability of the pin 6 under the combined action of the spring 19 and the magnet 20. When the pin 6 is cut into two parts, the half of the pin 6 located in the circular groove 15 is attracted to the magnet 20, making it completely located inside the pin 6, while the half of the pin 6 located in the stepped hole is discharged to the outside of the cylinder 1 by the reaction force of the spring 19. This prevents the cut pin 6 from getting stuck between the pusher ring 3 and the inner wall of the cylinder 1, avoiding the pusher ring 3 from causing the cut pin 6 to slide on the inner wall of the cylinder 1 during movement, thus preventing damage or scraping of the cylinder 1 and extending the service life of the cylinder 1.

[0035] In summary, before entering the well, connect the end of the upper connector 2 furthest from the cylinder 1 to the threaded end of the upper fishing string, check the placement of the pin 6, and tighten the connecting threads between the cylinder 1 and the upper connector 2. When the tool encounters the top of the coiled tubing stuck at the bottom of the well, intermittently rotate the tubing string to lower it. Use the guide shoe hook at the bottom of the cylinder 1 to guide the fish head into the tool, and then continue lowering the tubing string to facilitate the coiled tubing passing through the tool's inner cavity. If obstruction occurs midway, the pump can be turned on to flush and the tubing string can be rotated for milling. During the rotation of the tubing string, the outer cylinder 1 rotates with the tubing string, while the internal plate-shaped combined slip assembly remains stationary due to the friction of the tubing string in a free state, thereby protecting the slips from wear during milling. After the tool is successfully lowered to the fishing position, lift the tubing string. The plate-shaped combined slips move downward under the friction of the tubing string. The tool moves while the frustum-shaped slips 5 continuously hold the tubing string. After the tubing string is lifted with increased tonnage, the slip sleeve 4 moves downward under the reverse force, thereby subjecting the pusher ring 3 to force. When the force exceeds the shear pin 6, the pin 6 is sheared, and the pusher ring 3 moves downward. Under the action of the conical surface at the bottom of the pusher ring 3, the cutter 8 is forced to retract inward and contact the fallen fish tubing string. Then, the tubing string is rotated to start the cutting process. As the tubing string rotates, the slip sleeve 4 and the cylinder 1 rotate to protect the slips from moving and reduce wear. The cutter 8 follows the rotation of the tubing string to form a ring cut at the contact point, ultimately cutting off the fallen fish. After the fallen fish is cut off, the tubing string is lifted again. Under the clamping action of the sheet-shaped combined slips, the cut tubing string is brought out of the well, thus completing the integrated effect of milling, cutting, and fishing of this tool.

[0036] In the description of this invention, it should be understood that the terms "coaxial," "bottom," "one end," "top," "middle," "other end," "upper," "side," "top," "inner," "front," "center," and "both ends," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention. Furthermore, those skilled in the art will understand that the beneficial effects to be achieved by this invention are merely to achieve better beneficial effects compared with the current embodiments in the prior art under specific conditions, rather than to directly achieve the best use effect in the industry.

[0037] The above description is merely a preferred embodiment of the present invention. It should be understood that the present invention is not limited to the forms disclosed herein and should not be construed as excluding other embodiments. It can be used in various other combinations, modifications, and environments, and can be altered within the scope of the concept described herein through the above teachings or related technologies or knowledge. Modifications and variations made by those skilled in the art that do not depart from the spirit and scope of the present invention should be within the protection scope of the appended claims.

Claims

1. A continuous tubing milling, cutting, and retrieval integrated retrieval cylinder, comprising a coaxially arranged cylinder body and an upper connector, wherein the upper connector is detachably connected to one end of the cylinder body, characterized in that, Inside the cylinder, along the direction near the upper connector, a cutter assembly, a pusher ring, and a plate-shaped combined slip assembly are sequentially arranged. The plate-shaped combined slip assembly includes a slip sleeve and multiple plate slips. The slip sleeve is movably disposed within the cylinder. The tails of the multiple plate slips are connected by annular spring plates to form hollow frustum-shaped slips. The opening of the frustum-shaped slips gradually increases in the direction away from the annular spring plates. The frustum-shaped slips are movably disposed within the slip sleeve. The inner wall of the slip sleeve has a conical surface between the frustum-shaped slips and the pusher ring. The opening of the slip sleeve at the conical surface gradually increases in the direction away from the annular spring plates. The distance from the plate-shaped slip gradually decreases; the pusher ring is connected to the cylinder by a pin; the cutter assembly includes two cutters, which are symmetrically arranged along the axis of the cylinder, with one end of the cutter away from the pusher ring hinged to the cylinder, and the axis of rotation of the cutter perpendicular to the axis of the cylinder; the inner wall of the plate-shaped slip is evenly provided with a number of slip teeth along its length; the inner wall of the tail of the plate-shaped slip is provided with a spring piece, which is in the shape of an inverted "V", one end of the spring piece is connected to the plate-shaped slip by a screw, and the other end is in contact with the plate-shaped slip.

2. The integrated milling, cutting, and retrieval cylinder for continuous tubing as described in claim 1, characterized in that, The end of the cutter away from the pusher ring is rotatably connected to a pin, which is fixedly connected to the cylinder. A torsion spring is sleeved on the pin, and the torsion spring is located between the cutter and the pin.

3. The integrated milling, cutting, and retrieval cylinder for continuous tubing as described in claim 2, characterized in that, The distance between the two cutting blades gradually decreases in the direction close to the pusher ring. A guide slope is provided on the outer wall of the cutting blade near the pusher ring. A pusher gap is formed between the guide slope and the inner wall of the cylinder for the pusher ring to be inserted.

4. The integrated milling, cutting, and retrieval cylinder for continuous tubing as described in claim 1, characterized in that, The outer wall of the cylinder has a stepped hole along its own radial direction, the stepped hole is connected to the inner cavity of the cylinder, the outer wall of the pusher ring has a circular groove, and the pin is adapted to both the stepped hole and the circular groove.

5. The integrated milling, cutting, and retrieval cylinder for continuous tubing as described in claim 4, characterized in that, The stepped hole has a large-diameter hole and a small-diameter hole sequentially opened along the direction close to the circular groove. The pin is slidably adapted to the small-diameter hole, and a limiting plate is slidably adapted to the large-diameter hole. The limiting plate is fixedly sleeved on the pin, and a spring is sleeved on the pin. One end of the spring is connected to the step formed by the large-diameter hole and the small-diameter hole, and the other end of the spring contacts the limiting plate.

6. The integrated milling, cutting, and retrieval cylinder for continuous tubing as described in claim 5, characterized in that, A magnet is installed inside the circular groove. The magnet attracts the pin, causing the spring to be in a compressed state. Under the force of the spring, a gap is created between the pin and the magnet.

7. The integrated milling, cutting, and retrieval cylinder for continuous tubing as described in claim 1, characterized in that, One end of the upper connector is fixed with a hollow external threaded tube, and one end of the cylinder is provided with an internal thread. The hollow external threaded tube is adapted to the thread of the upper connector.

8. The integrated milling, cutting, and retrieval cylinder for continuous tubing as described in claim 1, characterized in that, The cutter is made of alloy steel.

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