A type of drop and catch tool

Abstract

This utility model belongs to the field of oil and gas development technology, specifically relating to a release and reconnection tool. The release and reconnection tool includes a reconnection cylinder, a mechanical release assembly, and a hydraulic release assembly arranged coaxially. The mechanical release assembly is coaxially connected to the reconnection cylinder via a first shear pin. The hydraulic release assembly includes a body, an upper connector coaxially disposed above the body, a lower connector coaxially disposed below the body, and an inner sleeve coaxially disposed within the body. The inner sleeve is configured to move downward relative to the body in response to hydraulic pressure, thereby separating the body from the lower connector.

Description

Technical Field

[0001] This utility model belongs to the field of oil and gas development technology, specifically, it relates to a release and re-release tool. Background Technology

[0002] Tail-end reconnection fracturing, as an integrated cementing and completion string technology, mainly consists of two parts: the tail-end cementing string and the reconnection string. The tail-end cementing string is a conventional hanger cementing string, where the tail-end is suspended from the upper casing using a tail-end hanger for cementing operations. The reconnection string is used after cementing operations; it is run into the wellhead for fracturing operations. The reconnection string is anchored to the tail-end cementing string using anchoring slips, and an effective seal is achieved through a reconnection sealing device, ensuring the integrity of the entire string. After fracturing operations are completed, the reconnection string is rotated forward to disengage the anchoring slips and retrieve the reconnection string.

[0003] Tailpipe reconnection fracturing technology can effectively ensure the fracturing operation flow rate, and the reconnection tubing can be recycled, making it highly economical. However, in existing technologies, the reciprocating periodic movement of the reconnection tubing during fracturing can easily lead to deformation of the locking device, which in turn prevents the forward-rotating reconnection tubing from disengaging properly.

[0004] Therefore, there is an urgent need to develop a tool that can solve the above-mentioned technical problems and allow for the return of lost items. Utility Model Content

[0005] In view of the technical problems mentioned above, this utility model aims to provide a release and reconnection tool, which can solve the technical problem that the reconnection pipe cannot be properly detached.

[0006] According to this utility model, a release and reconnection tool is provided, including a reconnection cylinder, a mechanical release assembly, and a hydraulic release assembly arranged coaxially with each other. The mechanical release assembly is coaxially connected to the reconnection cylinder via a first shear pin. The hydraulic release assembly includes a body, an upper connector coaxially arranged above the body, a lower connector coaxially arranged below the body, and an inner sleeve coaxially arranged inside the body. The inner sleeve is configured to move downward relative to the body in response to hydraulic pressure and to separate the body from the lower connector.

[0007] In one specific embodiment, an elastic cylinder is provided at the lower end of the main body, and a locking cylinder is provided at the upper end of the lower connector. The elastic cylinder is coaxially disposed inside the locking cylinder, and the outer wall of the inner sleeve abuts against the inner wall of the elastic cylinder. The elastic cylinder and the locking cylinder are axially limited. After the inner sleeve moves downward relative to the main body in response to hydraulic pressure, the inner sleeve disengages from the inner wall of the elastic cylinder, so that the elastic cylinder can radially retract to release the axial limitation with the locking cylinder.

[0008] In one specific embodiment, a locking block is provided on the outer wall of the elastic cylinder, and a locking groove for fitting the locking block is provided on the inner wall of the locking cylinder.

[0009] In one specific embodiment, the inner sleeve includes a second sleeve segment and a third sleeve segment arranged coaxially from top to bottom. The outer diameter of the second sleeve segment is smaller than the outer diameter of the third sleeve segment. In a first state, the outer wall of the third sleeve segment is in contact with the inner diameter of the elastic cylinder. In a second state, the third sleeve segment is located below the elastic cylinder.

[0010] In one specific embodiment, the inner sleeve includes a first sleeve segment coaxially disposed at the upper end of the second sleeve segment, and the inner wall of the first sleeve segment is in contact with the inner wall of the body.

[0011] In one specific embodiment, a pressure relief hole is provided on the body. In a first state, the pressure relief hole is in a blocked state, and in a second state, the pressure relief hole connects the inner cavity of the body with the outside.

[0012] In one specific embodiment, a first tooth is provided at the upper end of the elastic cylinder, and a second tooth is provided at the upper end of the locking cylinder for matching the first tooth.

[0013] In one specific embodiment, the inner sleeve is connected to the body via a second shear pin.

[0014] In one specific embodiment, a ball stand for throwing the ball is provided inside the inner sleeve.

[0015] In one specific embodiment, the mechanical release assembly includes an emergency protection cylinder, which is connected to the reconnection cylinder via a first shear pin.

[0016] Compared with the prior art, the advantages of this application are as follows.

[0017] This utility model relates to a mechanical and hydraulic dual-action release and reconnection tool. On the one hand, it does not affect the normal retrieval operation of the reconnection string. On the other hand, if the reconnection string cannot be retrieved normally, an emergency retrieval operation method of mechanical or hydraulic can be selected according to the actual well conditions on site. Attached Figure Description

[0018] The present invention will now be described with reference to the accompanying drawings.

[0019] Figure 1 A schematic diagram of one embodiment of the mechanical release assembly of the release and re-release tool according to the present invention is shown;

[0020] Figure 2A schematic diagram of one embodiment of the hydraulic release assembly of the release and re-release tool according to the present invention is shown.

[0021] The reference numerals in the figure are as follows:

[0022] 1. Reconnection sleeve; 2. Mechanical release assembly; 21. Emergency protection sleeve; 3. First shear pin; 4. Hydraulic release assembly; 41. Body; 411. Elastic sleeve; 412. Locking block; 413. First toothed insert; 414. Pressure relief hole; 42. Upper connector; 43. Lower connector; 431. Locking sleeve; 432. Locking groove; 433. Second toothed insert; 44. Inner sleeve; 441. Ball seat; 442. Second sleeve section; 443. Third sleeve section; 444. First sleeve section; 45. Second shear pin; 5. Ball; 6. Tail pipe cementing string; 100. Release and reconnection tool.

[0023] In this application, all the accompanying drawings are schematic drawings, used only to illustrate the principle of the present invention, and are not drawn to scale. Detailed Implementation

[0024] The present invention will now be described with reference to the accompanying drawings.

[0025] It should be noted that in this application, the direction of the release and retrieval tool according to the present invention after entering the well and approaching the ground is described as "up", "forward" or similar terms, while the direction of the release and retrieval tool after entering the well and away from the ground is described as "down", "back" or similar terms.

[0026] Figure 1 and Figure 2 The structure of the drop-and-retrieve tool 100 according to this utility model is shown. For example... Figure 1 and Figure 2 As shown, the release and reconnection tool 100 mainly includes a reconnection cylinder 1, a mechanical release assembly 2, and a hydraulic release assembly 4.

[0027] In this embodiment, the hydraulic release assembly 4, the mechanical release assembly 2, and the return cylinder 1 are coaxially fixedly connected from top to bottom.

[0028] The lower end of the return sleeve 1 is used for fixed connection with the tailpipe cementing string 6.

[0029] The mechanical release assembly 2 is coaxially fixedly mounted on the upper end of the reconnection cylinder 1. Specifically, the mechanical release assembly 2 includes an emergency protection cylinder 21, which is cylindrical in shape and coaxially fixedly mounted on the upper end of the reconnection cylinder 1. The emergency protection cylinder 21 and the reconnection cylinder 1 are fixedly connected by first shear pins 3. Multiple first shear pins 3 are evenly arranged along the circumference. By adjusting the number of first shear pins 3, the force of the mechanical release can be controlled. In this configuration, when mechanical release is required, the emergency protection cylinder 21 is rotated relative to the reconnection cylinder 1, cutting the first shear pins 3, thereby separating the emergency protection cylinder 21 from the reconnection cylinder 1 and realizing mechanical release.

[0030] In this embodiment, both the anchoring mechanism of the tailpipe cementing string 6 and the sealing structure of the return sleeve 1 are treated with Teflon spraying to prevent loose anchoring and poor sealing due to cement slurry adhesion during the cementing process.

[0031] In this embodiment, the hydraulic release assembly 4 is coaxially fixed above the mechanical release assembly 2. Figure 2 As shown, the hydraulic release assembly 4 mainly includes a body 41, an upper connector 42, a lower connector 43, and an inner sleeve 44. All components are cylindrical. The upper connector 42 has an external thread at its lower end, and the body 41 has an internal thread at its upper end. The upper connector 42 is coaxially fixed to the upper end of the body 41 via a threaded connection. The inner sleeve 44 is coaxially disposed inside the body 41. The lower end of the lower connector 43 is coaxially fixedly connected to the upper end of the mechanical release assembly 2. In the first state, a second shear pin 45 is provided between the inner sleeve 44 and the body 41. By installing a certain number of second shear pins 45, pressure erosion during the fracturing process prevents the hydraulic release assembly 4 from prematurely releasing. The outer wall of the lower end of the inner sleeve 44 radially abuts against the inner wall of the lower end of the body 41, thus preventing the inner wall of the lower end of the body 41 from radially contracting. The lower connector 43 is coaxially fixed on the outer side of the lower end of the body 41, and the lower connector 43 is interlocked with the body 41. In the second state, the inner sleeve 44 moves downward relative to the body 41 in response to hydraulic pressure, so that the outer wall of the inner sleeve 44 no longer radially abuts against the inner wall of the lower end of the body 41, allowing the lower end of the body 41 to contract radially, thereby releasing the interlocking state between the body 41 and the lower connector 43, and separating the body 41 from the lower connector 43.

[0032] In one specific embodiment, the lower end of the body 41 is configured as a radially retractable elastic cylinder 411, and a locking block 412 is provided on the outer wall of the elastic cylinder 411. A locking groove 432 for fitting the locking block 412 is provided on the inner wall of the locking cylinder 431. The inner sleeve 44 includes a second sleeve section 442 and a third sleeve section 443 arranged coaxially from top to bottom, and the outer diameter of the second sleeve section 442 is smaller than the outer diameter of the third sleeve section 443. In the first state, the locking cylinder 431 is coaxially sleeved on the outside of the elastic cylinder 411, and the locking block 412 on the elastic cylinder 411 is engaged in the locking groove 432 of the locking cylinder 431. The outer wall of the third sleeve section 443 is in contact with the inner diameter of the elastic cylinder 411, so that the elastic cylinder 411 cannot retract radially, thereby axially fixing the body 41 to the lower connector 43. In the second state, the inner sleeve 44 moves downward relative to the body 41 in response to the hydraulic pressure, causing the third sleeve section 443 to move below the elastic cylinder 411. The inner wall of the elastic cylinder 411 is no longer radially abutted. At this time, by lifting the body 41, the elastic cylinder 411 can be radially contracted, releasing the axial limit between the elastic cylinder 411 and the locking cylinder 431, thus completing the release.

[0033] In this embodiment, the inner sleeve 44 further includes a first sleeve 444 coaxially disposed at the upper end of the second sleeve segment 442. The inner wall of the first sleeve segment 444 contacts the inner wall of the body 41. A ball seat 441 for sealing and fitting with the ball 5 is provided at the upper end of the first sleeve segment 444. When it is necessary to move the inner sleeve 44 downward relative to the body 41, the ball 5 is placed into the ball seat 441, the ball 5 seals the ball seat 441, and then the inner sleeve 44 is pushed downward relative to the body 41 by applying pressure.

[0034] Furthermore, the position where the ball seat 441 and the ball 5 are matched adopts an anti-erosion structure, and is designed with an anti-erosion ball socket to prevent the sealing surfaces of the ball seat 441 and the ball seat 5 from being eroded during the fracturing and sand adding process, thus affecting the sealing effect.

[0035] The hydraulic retraction emergency tool is corrosion-resistant, can be repeatedly locked, and enables repeated reservoir modification.

[0036] Furthermore, a pressure relief hole 11 is provided on the main body 1, and at least two sealing elements are provided between the inner sleeve 44 and the main body 41. In the first state, the two sealing elements between the inner sleeve 44 and the main body 41 are located on the upper and lower sides of the pressure relief hole 11, respectively, so that the pressure relief hole 11 is in a blocked state. In the second state, the inner sleeve 44 moves downward relative to the main body 41, so that the pressure relief hole 11 connects the inner cavity of the main body 1 with the outside, thereby preventing the inner sleeve 44 from moving further downward relative to the main body 41.

[0037] In this embodiment, a first toothed tooth 413 is provided at the upper end of the elastic cylinder 411, and a second toothed tooth 433 is provided at the upper end of the locking cylinder 431 for matching the first toothed tooth 413. By providing the first toothed tooth 413 and the second toothed tooth 433, on the one hand, torque can be transmitted between the elastic cylinder 411 and the locking cylinder 431, providing feasibility for the release of the mechanical release assembly 2; on the other hand, while meeting the normal connection strength, the release and retraction tool 100 has the ability to rotate and descend.

[0038] In the description of this utility model, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0039] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0040] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0041] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and does not constitute any limitation on this utility model. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A release back tool, characterized by, The device includes a reconnecting cylinder (1), a mechanical release assembly (2), and a hydraulic release assembly (4) arranged coaxially with each other. The mechanical release assembly (2) is coaxially connected to the reconnecting cylinder (1) via a first shear pin (3). The hydraulic release assembly (4) includes a body (41), an upper connector (42) coaxially arranged above the body (41), a lower connector (43) coaxially arranged below the body (41), and an inner sleeve (44) coaxially arranged inside the body (41). The inner sleeve (44) is configured to move downward relative to the body (41) in response to hydraulic pressure and to separate the body (41) from the lower connector (43).

2. The drift-off back-off tool of claim 1, wherein, An elastic cylinder (411) is provided at the lower end of the body (41), and a locking cylinder (431) is provided at the upper end of the lower connector (43). The elastic cylinder (411) is coaxially disposed inside the locking cylinder (431), and the outer wall of the inner sleeve (44) abuts against the inner wall of the elastic cylinder (411). The elastic cylinder (411) and the locking cylinder (431) are axially limited. After the inner sleeve (44) moves downward relative to the body (41) in response to the hydraulic pressure, the inner sleeve (44) disengages from the inner wall of the elastic cylinder (411), so that the elastic cylinder (411) can radially retract to release the axial limitation with the locking cylinder (431).

3. The drift-off back-off tool of claim 2, wherein, A locking block (412) is provided on the outer wall of the elastic cylinder (411), and a locking groove (432) for matching the locking block (412) is provided on the inner wall of the locking cylinder (431).

4. The drift-off back-off tool of claim 3, wherein, The inner sleeve (44) includes a second sleeve section (442) and a third sleeve section (443) arranged coaxially from top to bottom. The outer diameter of the second sleeve section (442) is smaller than the outer diameter of the third sleeve section (443). In a first state, the outer wall of the third sleeve section (443) is in contact with the inner diameter of the elastic cylinder (411). In a second state, the third sleeve section (443) is located below the elastic cylinder (411).

5. The drill-in tool of claim 4, wherein, The inner sleeve (44) includes a first sleeve segment (444) coaxially disposed at the upper end of the second sleeve segment (442), and the inner wall of the first sleeve segment (444) is in contact with the inner wall of the body (41).

6. The drift-off back-off tool of claim 5, wherein, A pressure relief hole (414) is provided on the body (41). In the first state, the pressure relief hole (414) is in a blocked state. In the second state, the pressure relief hole (414) connects the inner cavity of the body (41) with the outside.

7. The drift-off back-off tool of claim 2, wherein, A first tooth (413) is provided at the upper end of the elastic cylinder (411), and a second tooth (433) is provided at the upper end of the locking cylinder (431) for matching the first tooth (413).

8. The drift-off tie tool of claim 2, wherein, The inner sleeve (44) is connected to the body (41) by a second shear pin (45).

9. The drift-off back-off tool of claim 2, wherein, A ball stand (441) for throwing the ball is provided inside the inner sleeve (44).

10. The back-off tool of any of claims 1-9, wherein, The mechanical release assembly (2) includes an emergency protection cylinder (21), which is connected to the return cylinder (1) via a first shear pin (3).

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