A device for preventing deformation of a bushing joint

Abstract

The application discloses a casing joint deformation prevention device, which mainly comprises a casing, a coupling, a coupling cylinder, an end cylinder, a flexible joint, a connecting cylinder, a compressible flexible ring and a ball. The coupling is arranged between two casings to connect the casings and make them coaxial. The coupling cylinder is arranged outside the coupling and coaxial. The end cylinder is arranged on the two sides of the coupling cylinder. The flexible joint is arranged between the end cylinder and the connecting cylinder and coaxial. The compressible flexible ring is made of a compressible material and is arranged in the annulus between the coupling and the coupling cylinder, the end cylinder and the casing, the flexible joint and the casing and the connecting cylinder and the casing. The application mainly protects the casing coupling under the conditions of formation shear deformation and creep, and the protection device has the characteristics of simple structure, convenient disassembly and the like.

Description

Technical Field

[0001] This invention relates to a mechanical device for protecting sleeve connections, used to straighten sleeve connections and protect weak points in the joints, belonging to the field of mechanical engineering technology. Background Technology

[0002] The complex geological conditions in oil and gas development result in highly developed faults and fractures, especially during multi-stage fracturing. When fracturing fluid enters natural fractures or weak bedding planes, it can easily cause casing deformation due to fault slippage. Casing deformation prevents the fracturing tool string from reaching its intended position, resulting in incomplete fracturing operations in some sections and impacting oil and gas development efficiency. Furthermore, in addition to the tensile, compressive, torsional, and bending loads required for casing operation, there are also a series of issues arising from connection and installation.

[0003] Chinese patent publication CN216130883U discloses a quick-release male thread protection device for oil and gas drilling casing. This device effectively protects the casing, but it is inconvenient to operate and prone to damaging the male thread. Chinese patent publication CN107724972B discloses a marine flexible pipe protection device. This device has a small structural weight and relatively low rigidity, and can be constructed by connecting multiple sections of protective netting and tie rods in series. The number of combined structures can be flexibly adjusted according to the length of the flexible pipe to be protected. However, it has shortcomings in connection and installation. Therefore, it is necessary to design a casing joint deformation prevention device to avoid or reduce the impact of casing installation and impact loads. Summary of the Invention

[0004] The purpose of this invention is to solve the problems caused by the installation of the sleeve connection and impact load, and to provide a device for preventing deformation of the sleeve joint. This device can be used to straighten the sleeve connection and protect the weak points of the joint.

[0005] To achieve the above objectives, the technical solution adopted by the present invention to solve this technical problem is as follows:

[0006] In a first aspect, the present invention provides a device for preventing deformation of a sleeve joint, the device mainly comprising a sleeve 1, a sleeve 2, a coupling, a coupling sleeve, an end sleeve, a flexible joint, a connecting sleeve, an end sealing ring, a ball bearing, rivets, and a compressible flexible ring; the sleeve 1 and sleeve 2 are disposed on both sides of the coupling and are coaxial and fixed by a threaded connection; the coupling sleeve is composed of coupling block 1 and coupling block 2 connected by four rivets and is disposed outside the coupling; the end sleeve is composed of end block 1 and end block 2 connected by six rivets. The flexible joint is formed by setting it on the left and right sides of the coupling cylinder and connecting it with 6 rivets; the flexible joint is composed of end pressure-resistant structure 1, cylinder pressure-resistant structure 2, pressure-resistant structure 3, sealing structure 1 and sealing structure 2, and is fixed between the end cylinder and the connecting cylinder by 6 rivets and threaded connection; the two sides of the connecting cylinder are fixed between the two sets of flexible joints by threaded connection; the compressible flexible ring is set in the annular space between the coupling and the coupling cylinder, the end cylinder and the sleeve 2, the flexible joint and the sleeve 2, and the connecting cylinder and the sleeve 2, to reduce the impact load on the sleeve.

[0007] Furthermore, the coupling is used to fix sleeve 1 and sleeve 2 by threaded connection. During the connection and installation process, sleeve 1 and sleeve 2 are straightened to ensure that the two sleeves are coaxial.

[0008] Furthermore, 18 balls are arranged on the outside of the coupling cylinder and 42 balls are arranged on the outside of the end cylinder to facilitate the insertion of the sleeve.

[0009] Furthermore, the compressible flexible ring is made of a compressible material, providing annular compressible space when creep or slip occurs in the formation, reducing casing deformation. It is set in the annulus between the coupling and the coupling cylinder, the end cylinder and the casing 2, the flexible joint and the casing 2, and the connecting cylinder and the casing 2, and adopts an interference fit.

[0010] Compared with the prior art, the beneficial effects of the present invention are:

[0011] 1) The present invention provides a compressible flexible ring in the annulus between the coupling and the coupling cylinder, the end cylinder and the sleeve 2, the flexible joint and the sleeve 2, and the connecting cylinder and the sleeve 2. The compressible flexible ring is made of compressible material and provides a compressible space in the annulus when the formation creeps or slips, thereby reducing the deformation of the sleeve.

[0012] 2) The present invention adds a coupling cylinder to the outside of the coupling and sets ball bearings on the outside of the coupling cylinder and the end cylinder, which can realize the three functions of straightening, reducing friction and protecting the sleeve in one piece. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of a sleeve connection protection structure according to the present invention;

[0014] Figure 2 for Figure 1 Schematic diagram of the middle coupling;

[0015] Figure 3 for Figure 1 A schematic diagram of the coupling cylinder composed of coupling block 1 and coupling block 2;

[0016] Figure 4 for Figure 1 A schematic diagram of the end tube composed of middle end block 1 and end block 2;

[0017] Figure 5 for Figure 1 Schematic diagram of a flexible joint;

[0018] Figure 6 for Figure 5 Cross-sectional view of a flexible joint

[0019] Figure 7 for Figure 5 Schematic diagram of the middle end pressure-resistant structure 1, the cylinder pressure-resistant structure 2, the pressure-resistant structure 3, the sealing structure 1, and the sealing structure 2;

[0020] Explanation of icon numbers:

[0021] 1-Sleeve 1, 2-Sleeve 2, 3-Coupling, 4-Coupling cylinder, 401-Coupling block 1, 402-Coupling block 2, 5-End cylinder, 501-End block 1, 502-End block 2, 6-Flexible joint, 7-Connecting cylinder, 8-End sealing ring, 9-Ball, 10-Rivet, 11-Compressible flexible ring. Detailed Implementation

[0022] The present invention provides a device for preventing deformation of a sleeve joint, with reference to the accompanying drawings.

[0023] The present invention provides a device for preventing deformation of sleeve joints, comprising the following steps:

[0024] like Figure 1The device for preventing deformation of a sleeve joint, as shown, includes a first sleeve 1, a second sleeve 2, a coupling 3, a coupling cylinder 4, an end cylinder 5, a flexible joint 6, a connecting cylinder 7, an end sealing ring 8, a ball bearing 9, rivets 10, and a compressible flexible ring 11. The first sleeve 1 and the second sleeve 2 are disposed on both sides of the coupling 3 and are coaxial and fixed by a threaded connection. The coupling cylinder 4 is composed of a first coupling block 401 and a second coupling block 402 connected by four rivets 10 and is disposed outside the coupling 3. The end cylinder 5 is composed of an end block 501 and an end block 502 connected by six rivets 10 and is disposed on the left side of the coupling cylinder 4. The right sides are connected by 6 rivets 10; the flexible joint 6 is composed of 1 end pressure-resistant structure 601, 2 cylinder pressure-resistant structure 602, 3 pressure-resistant structure 604, 1 sealing structure 603 and 2 sealing structure 605, and is fixed between the end cylinder 5 and the connecting cylinder 7 by 6 rivets 10 and threaded connection; the two sides of the connecting cylinder 7 are fixed between the two sets of flexible joints 6 by threaded connection; the compressible flexible ring 11 is set in the annular space between the coupling 3 and the coupling cylinder 4, the end cylinder 5 and the 2 sleeve 2, the flexible joint 6 and the 2 sleeve 2, and the connecting cylinder 7 and the 2 sleeve 2, to reduce the impact load on the sleeve.

[0025] like Figure 2 The coupling shown is used to fix sleeve 1 and sleeve 2 by threaded connection. During the connection and installation process, sleeve 1 and sleeve 2 are straightened so that each level of sleeve can be assembled coaxially.

[0026] like Figure 3 The coupling shown is composed of coupling block 1 and coupling block 2 connected by four rivets. Figure 2 The coupling shown is an interference fit, and its outer side is equipped with ball bearings to facilitate the insertion of the sleeve.

[0027] like Figure 4 The end sleeve shown is composed of end block 1 and end block 2, with ball bearings on its outer side for easy lowering and installation of the sleeve; the end sleeve is connected to the sleeve by 6 rivets. Figure 3 The coupling cylinders shown are connected and end sealing rings are installed at the connection.

[0028] like Figure 5 The flexible joint shown is made of Figure 7 The structure consists of end pressure-resistant structure 1, cylindrical pressure-resistant structure 2, pressure-resistant structure 3, sealing structure 1, and sealing structure 2, and is fixed to the wall by six rivets and threads. Figure 4 The end cylinder and the connecting cylinder are shown; and an end sealing ring is installed at the connection with the end cylinder.

[0029] like Figure 1 The connecting cylinder shown is fixed to two sets of flexible joints on both sides by threaded connections, so that each protective component can be connected and fixed.

[0030] like Figure 1 The compressible flexible ring shown is made of compressible material and provides annular compressible space when the formation creeps or slips, reducing casing deformation. It is set in the annulus between the coupling and the coupling cylinder, the end cylinder and the casing 2, the flexible joint and the casing 2, and the connecting cylinder and the casing 2, and adopts an interference fit.

Claims

1. A device for preventing deformation of a sleeve joint, characterized in that, The main components include sleeve 1 (1), sleeve 2 (2), coupling (3), coupling cylinder (4), end cylinder (5), flexible joint (6), connecting cylinder (7), end sealing ring (8), ball bearing (9), rivet (10), and compressible flexible ring (11); sleeve 1 (1) and sleeve 2 (2) are located on both sides of coupling (3) and are coaxial and fixed by threaded connection; coupling cylinder (4) is composed of coupling block 1 (401) and coupling block 2 (402) connected by 4 rivets (10) and is located outside coupling (3); end cylinder (5) is composed of end block 1 (501) and end block 2 (502) connected by 6 rivets (10) and is located on the left and right sides of coupling cylinder (4) and is connected by threaded connection. The flexible joint (6) is connected by six rivets (10); the flexible joint (6) is composed of an end pressure-resistant structure 1 (601), a cylindrical pressure-resistant structure 2 (602), a pressure-resistant structure 3 (604), a sealing structure 1 (603) and a sealing structure 2 (605), and is fixed between the end cylinder (5) and the connecting cylinder (7) by six rivets (10) and threaded connection; the two sides of the connecting cylinder (7) are fixed between the two sets of flexible joints (6) by threaded connection; the compressible flexible ring (11) is set in the annular space between the coupling (3) and the coupling cylinder (4), the end cylinder (5) and the sleeve 2 (2), the flexible joint (6) and the sleeve 2 (2), and the connecting cylinder (7) and the sleeve 2 (2) to reduce the impact load on the sleeve.

2. The anti-deformation device for sleeve joints according to claim 1, characterized in that, The coupling sleeve (4) is composed of coupling block 1 (401) and coupling block 2 (402) connected by 4 rivets (10), and has ball bearings (9) on its outer side to facilitate the insertion of the sleeve.

3. The anti-deformation device for sleeve joints according to claim 1, characterized in that, The end cylinder (5) is composed of end block 1 (501) and end block 2 (502), and is provided with ball bearings (9) on its outer side to facilitate the insertion of the sleeve; the end cylinder (5) is connected to the coupling cylinder (4) by 6 rivets (10) and an end sealing ring (8) is installed at the connection.

4. The anti-deformation device for sleeve joints according to claim 1, characterized in that, The flexible joint (6) is composed of an end pressure-resistant structure 1 (601), a cylindrical pressure-resistant structure 2 (602), a pressure-resistant structure 3 (604), a sealing structure 1 (603), and a sealing structure 2 (605), and is fixed between the end cylinder (5) and the connecting cylinder (7) by six rivets (10) and threaded connection; and an end sealing ring (8) is installed at the connection with the end cylinder (5).

5. The anti-deformation device for sleeve joints according to claim 1, characterized in that, The compressible flexible ring (11) is made of compressible material and provides an annular compressible space when the formation creeps or slips, reducing the deformation of the casing. It is set in the annular space between the coupling (3) and the coupling cylinder (4), the end cylinder (5) and the casing 2 (2), the flexible joint (6) and the casing 2 (2), and the connecting cylinder (7) and the casing 2 (2), and adopts an interference fit.

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