Diameter-variable oil casing coupling

Abstract

The utility model relates to the technical field of oil casing pipes, in particular to a variable-diameter oil casing pipe coupling which comprises a pipe body and a fastening assembly, the inner wall of the pipe body is machined to form at least three stages of platforms, and the pipe body comprises a first inserting platform, a second inserting platform and a third inserting platform; the first inserting platform, the second inserting platform and the third inserting platform can enable the coupling to be connected with two petroleum casings with different pipe diameters, the fastening assembly is arranged at the end of the inner wall of the pipe body, and the fastening assembly can clamp and fix the petroleum casings. The oil casing coupling has the advantages that the oil casing coupling can connect two oil casings with different pipe diameters, and the construction efficiency is improved.

Description

Technical Field

[0001] The present application relates to the technical field of oil casing, and in particular to a variable-diameter oil casing coupling. Background Art

[0002] At present, oil casings are an essential part of oil and gas drilling. The oil casings are lowered into the wellbore and integrated with the cement for well cementing, thus stabilizing the wellbore structure, ensuring the stability of the wellbore, and preventing the collapse of the wellbore wall. The oil casing coupling is a metal component used to connect oil casings, and the oil casing coupling can connect casings of different lengths to form a complete casing string.

[0003] The existing oil casing couplings are connected to the oil casings through threads, and the oil casing couplings can connect two different oil casings.

[0004] The above prior art solutions have the following defects: When using the coupling to connect oil casings, it is encountered that two oil casings with different diameters need to be connected, and different oil casing couplings need to be manufactured for separate connections, resulting in low construction efficiency and material waste. Utility Model Content

[0005] In order for the oil casing coupling to connect two oil casings with different diameters and improve construction efficiency, the present application provides a variable-diameter oil casing coupling.

[0006] The above technical objectives of the present application are achieved through the following technical solutions:

[0007] A variable-diameter oil casing coupling includes a pipe body and a fastening assembly. At least three-order platforms are formed by machining the inner wall of the pipe body. The pipe body includes a first insertion platform, a second insertion platform, and a third insertion platform. The first insertion platform, the second insertion platform, and the third insertion platform can enable the coupling to connect two oil casings with different diameters. The fastening assembly is arranged at the end of the inner wall of the pipe body, and the fastening assembly can clamp and fix the oil casing.

[0008] By adopting the above technical solution, the pipe body and the fastening assembly can be used to connect two oil casings with different diameters. The fastening assembly can clamp and fix the oil casing inserted into the coupling, enhancing the stability of the connection between the coupling and the oil casing, and preventing the oil casing from disengaging from the coupling. This provides flexibility for oilfield operations, especially in occasions where casings of different diameters need to be connected, reduces the inventory requirements for special casings and couplings, thereby reducing material costs, and also makes the installation and maintenance of the coupling easier.

[0009] Optionally, the fastening assembly includes a clamping seat, a limiting member, a rotating plate, a clamping member, a driving rod, and a fixing plate. The clamping seat is arranged at the end of the pipe body. The limiting member is fixedly connected to the surface of the clamping seat. The rotating plate is rotatably arranged on the surface of the clamping member. The clamping member is hinged to the plate surface of the rotating plate. One end of the driving rod is fixedly connected to the peripheral wall of the clamping member. The fixing plate is arranged on the side of the clamping member away from the rotating plate and is hinged to the clamping member. The fixing plate is fixedly connected to the rotating plate. A sliding groove is formed on the surface of the limiting member away from the clamping seat. The end of the driving rod away from the clamping member is slidably arranged in the sliding groove.

[0010] By adopting the above technical solution, by providing the clamping seat, the limiting member, the rotating plate, the clamping member, the driving rod, and the fixing plate, the limiting member can fix the rotating plate, the clamping member, and the fixing plate. The end of the driving rod slides in the second sliding groove. During the process of rotating the rotating plate and the fixing plate, since the hinge points of the clamping member with the fixing plate and the rotating plate deviate from the center of the surface of the clamping member, as the end of the sliding member slides, the clamping member can be driven to move towards the axis of the rotating plate. The clamping member can clamp and fix the oil casing, always clamp the oil casing, enhance the stability of the connection between the coupling and the oil casing, and prevent the oil casing from separating from the coupling.

[0011] Optionally, a receiving groove is formed on the surface of the limiting member close to the rotating plate. The rotating plate is adapted to the receiving groove and is slidably inserted into the receiving groove.

[0012] By adopting the above technical solution, by providing the limiting member and the receiving groove, the rotating plate can be fixed to prevent it from detaching from the clamping seat during rotation.

[0013] Optionally, a fixing groove is formed on the plate surface of the clamping seat. The fastening assembly further includes a fixing column. One end of the fixing column is fixedly connected to the fixing plate, and the other end is slidably arranged in the fixing groove.

[0014] By adopting the above technical solution, by providing the fixing groove, the rotation angles of the fixing plate and the rotating plate can be limited to prevent damage to the oil casing due to excessive clamping.

[0015] Optionally, the fastening assembly further includes a spring. The spring is arranged in the fixing groove. One end of the spring is fixedly connected to the end of the fixing groove, and the other end is fixedly connected to the peripheral wall of the end of the fixing column.

[0016] By adopting the above technical solution, by providing the spring, when the cable is threaded into the pipeline by the traction device, the fixing assembly can always clamp the cable to prevent the cable from detaching from the traction device.

[0017] Optionally, a heat insulation cavity is formed inside the pipe body. The heat insulation cavity is coaxially arranged with the pipe body.

[0018] By adopting the above technical solution, by providing a heat insulation cavity, the heat dissipation loss of the hot fluid during injection can be reduced, and the coupling and the casing can also be protected, reducing material fatigue and damage caused by high temperature and extending the service life of the equipment.

[0019] Optionally, a plurality of reinforcing ribs are arranged in the heat insulation cavity, and the plurality of reinforcing ribs are evenly spaced in the heat insulation cavity.

[0020] By adopting the above technical solution, by providing the reinforcing ribs, the overall strength of the coupling can be enhanced, the heat insulation cavity can be supported, and the excessive pressure on the coupling during use can be avoided, interfering with the normal use of the coupling.

[0021] Optionally, an installation groove is provided on the inner wall of the pipe body, and the pipe body further includes a sealing member, and the sealing member is inserted into the installation groove.

[0022] By adopting the above technical solution, by providing the sealing member, the sealing performance of the coupling can be improved, leakage during the use of the coupling can be avoided, and the sealing member can strongly support the inner wall of the coupling, enhancing the strength of the coupling.

[0023] Optionally, the surface of the fastening assembly is attached with an internal corrosion coating.

[0024] By adopting the above technical solution, it can be avoided that the fastening assembly of the oil casing coupling is corroded and damaged during long-term use, interfering with the normal use of the coupling.

[0025] In summary, the present application has the following technical effects:

[0026] 1. By providing a pipe body and a fastening assembly, two oil casings with different diameters can be connected. The fastening assembly can clamp and fix the oil casing inserted into the coupling, enhancing the stability of the connection between the coupling and the oil casing and preventing the oil casing from disengaging from the coupling;

[0027] 2. By providing a clamping seat, a limiting member, a rotating plate, a clamping member, a driving rod and a fixing plate, the stability of the connection between the coupling and the oil casing can be enhanced, and the oil casing can be prevented from disengaging from the coupling;

[0028] 3. By providing a heat insulation cavity, the heat dissipation loss of the hot fluid during injection can be reduced, and the coupling and the casing can also be protected, reducing material fatigue and damage caused by high temperature and extending the service life of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 is the external shape structure diagram of the present application;

[0030] Figure 2 is the cross-sectional structure diagram of the present application;

[0031] Figure 3 It is a prominent structural diagram of the fastening component of the present application.

[0032] Explanation of reference numerals: 1, pipe body; 11, first insertion platform; 111, first sealing groove; 12, second insertion platform; 121, second sealing groove; 13, third insertion platform; 131, third sealing groove; 14, installation groove; 15, seal; 16, heat insulation cavity; 17, reinforcing rib; 18, annular groove; 2, fastening component; 21, clamping seat; 211, fixing groove; 22, limiting member; 23, rotating plate; 24, clamping member; 25, hinge column; 26, driving rod; 27, fixing column; 28, spring. Detailed implementation manners

[0033] The present application will be further described in detail below with reference to the accompanying drawings.

[0034] An embodiment of the present application discloses a variable-diameter oil casing coupling. Referring to Figure 1 , the coupling includes a pipe body 1 and a fastening component 2. The pipe body 1 is a variable-diameter pipe, which can connect two oil casings with different diameters, avoiding the need to manufacture different variable-diameter couplings when connecting two oil casings with different diameters, enhancing the connection strength and improving the working efficiency. The fastening component 2 can fix the oil casing inserted on the coupling and connect the oil casing with the coupling.

[0035] Combining Figure 1 and Figure 2 , the oil casing coupling includes a pipe body 1. The pipe body 1 is a metal cylinder with both ends open. The middle part of the inner wall of the pipe body 1 in the length direction is processed into a flared shape towards both ends of the pipe body 1, and the flared directions are opposite. The flared inner wall is processed into at least three-order platforms, including a first insertion platform 11, a second insertion platform 12, and a third insertion platform 13. The first insertion platform 11, the second insertion platform 12, and the third insertion platform 13 are all annular. The surfaces of the first insertion platform 11, the second insertion platform 12, and the third insertion platform 13 are all perpendicular to the length direction of the pipe body 1 and are coaxially arranged with the pipe body 1. First sealing grooves 111, second sealing grooves 121, and third sealing grooves 131 are respectively formed on the surfaces of the first insertion platform 11, the second insertion platform 12, and the third insertion platform 13. The first sealing grooves 111, the second sealing grooves 121, and the third sealing grooves 131 can seal the interface when oil casings with different diameters are inserted into the coupling, avoiding leakage of the oil casing during use.

[0036] Combining Figure 1 and Figure 2, the diameter of the pipe body 1 gradually decreases from the end to the middle of the pipe body 1, and the stepped pipe wall can be connected to two oil casings with different diameters, avoiding the need to make corresponding couplings for oil casings with different diameters before connection. The sealing assembly includes a seal 15. An installation groove 14 is provided in the middle of the inner wall of the pipe body 1. The installation groove 14 is annular. The seal 15 is arranged in the installation groove 14. The seal 15 is made of corrosion-resistant material. The seal 15 is annular. The seal 15 is adapted to the installation groove 14 and is inserted into the installation groove 14. The seal 15 can improve the sealing performance of the coupling, prevent leakage during the use of the coupling, and strongly support the inner wall of the coupling to enhance the strength of the coupling.

[0037] Combined with Figure 1 and Figure 2 , an insulation cavity 16 is provided inside the coupling. The insulation cavity 16 is annular. The axis of the insulation cavity 16 coincides with the axis of the pipe body 1. The insulation cavity 16 is close to the outer wall of the pipe body 1 and is spaced from the outer wall, reducing the heat dissipation loss during the injection of hot fluid. It can also protect the coupling and the casing, reduce material fatigue and damage caused by high temperature, and extend the service life of the equipment. Reinforcing ribs 17 are provided inside the insulation cavity 16. The reinforcing ribs 17 are square columns. There are multiple reinforcing members. The multiple reinforcing ribs 17 are evenly spaced inside the insulation cavity 16. The axis of the reinforcing ribs 17 coincides with the axis of the pipe body 1. The reinforcing ribs 17 can enhance the overall strength of the coupling, support the insulation cavity 16, and prevent the pressure on the coupling during use from being too large, interfering with the normal use of the coupling.

[0038] Combined with Figure 1 and Figure 3 , the fastening assembly 2 includes a clamping seat 21, a limiting member 22 and a rotating plate 23. An annular groove 18 is provided at the end face of the pipe body 1. The annular groove 18 communicates with the inner wall of the pipe body 1. The clamping seat 21 is arranged at the end of the inner wall of the pipe body 1. The clamping seat 21 is a ring-shaped metal plate. The outer peripheral wall of the clamping seat 21 is inserted into the annular groove 18. The plate surface of the clamping seat 21 fits with the bottom of the annular groove 18. The clamping seat 21 is coaxially arranged with the pipe body 1 and the inner peripheral wall of the clamping seat 21 is flush with the end of the inner wall of the pipe body 1. The limiting member 22 is fixedly connected to the surface of the clamping seat 21 facing away from the mounting table. The limiting member 22 is a square block. There are three limiting members 22. The three limiting members 22 are equally angularly distributed on the surface of the clamping seat 21 with the axis of the clamping seat 21 as the center.

[0039] Combined with Figure 1 and Figure 3, a receiving groove is formed on the side wall of the limiting member 22 close to the axis of the clamping seat 21, and the receiving groove is provided with an opening on the surface where the limiting member 22 fits the clamping seat 21. The rotating plate 23 is rotatably arranged among the three limiting members 22. The rotating plate 23 is an annular metal plate, the axis of the rotating plate 23 coincides with the axis of the clamping seat 21, the plate surface of the rotating plate 23 fits the surface of the clamping seat 21, the rotating plate 23 is adapted to the receiving groove and the rotating plate 23 is slidably arranged in the receiving groove, the peripheral wall of the rotating plate 23 fits the bottom of the receiving groove, and the limiting member 22 and the receiving groove formed on the limiting member 22 can prevent the rotating plate 23 from detaching from the clamping seat 21 during rotation.

[0040] Combined Figure 1 with Figure 3 , the fastening assembly 2 further includes a clamping member 24, a hinge post 25 and a fixing plate. The clamping member 24 is arranged on the plate surface of the rotating plate 23 facing away from the clamping seat 21. The clamping member 24 is a disc, and the plate surface of the clamping member 24 is parallel to the plate surface of the rotating plate 23. A driving rod 26 is fixedly connected to the peripheral wall of the clamping member 24, and the length direction of the driving rod 26 is perpendicular to the tangent plane of the peripheral wall of the clamping member 24. The hinge post 25 penetrates the clamping member 24 and is fixedly connected thereto. The length direction of the hinge post 25 is perpendicular to the plate surface of the clamping member 24. The position where the hinge post 25 penetrates the plate surface of the clamping member 24 deviates from the center of the plate surface and is close to the driving rod 26. The hinge post 25 penetrates the rotating plate 23 and is hinged to the rotating plate 23. There are three clamping members 24 and hinge posts 25, and the three clamping members 24 and hinge posts 25 are equally angularly distributed around the axis of the rotating plate 23 on the plate surface of the rotating plate 23.

[0041] Combined Figure 1 with Figure 3 , the fixing plate is arranged on the side of the clamping member 24 facing away from the rotating plate 23. The end of the hinge post 25 far from the rotating plate 23 penetrates the fixing plate and is hinged to the fixing plate. The fixing plate is an annular metal plate, the axis of the fixing plate coincides with the axis of the rotating plate 23, and fixed legs are integrally formed at the edge of the plate surface of the fixing plate opposite to the rotating plate 23. There are three fixed legs, and the three fixed legs are equally angularly distributed around the axis of the fixing plate on the plate surface of the fixing plate. The fixed legs are spaced from the clamping member 24, and the end surface of the fixed leg facing away from the fixing plate is fixedly connected to the plate surface of the rotating plate 23.

[0042] Combined Figure 1 with Figure 3 , a sliding groove is formed on the surface of the limiting member 22 facing away from the clamping seat 21. The length direction of the sliding groove is perpendicular to the axis of the clamping seat 21, and the second sliding grooves on the three limiting members 22 are all opened centripetally. A sliding member (not shown in the figure) is fixedly connected to the side wall of the end of the driving rod 26 far from the clamping member 24. The sliding member is adapted to the second sliding groove and the sliding member is slidably arranged in the second sliding groove.

[0043] Combined Figure 1 with Figure 3, the fastening assembly 2 further includes a fixing post 27 and a spring 28. A fixing groove 211 is formed on the surface of the clamping seat 21 where the rotating plate 23 is provided. The fixing groove 211 is arc-shaped, and the fixing groove 211 is spaced from the peripheral wall of the rotating plate 23. The center of the arc of the groove wall of the fixing groove 211 coincides with the center of the plate surface of the clamping seat 21. One end of the fixing post 27 is fixedly connected to the surface of the fixing leg away from the axis of the rotating plate 23, and the other end of the fixing post 27 bends towards the clamping seat 21 and is slidably inserted into the fixing groove 211. The spring 28 is arranged in the fixing groove 211. One end of the spring 28 is fixedly connected to the end wall of the fixing groove 211, and the other end is fixedly connected to the peripheral wall of the end of the fixing post 27. The spring 28 can enable the fastening assembly 2 to always clamp the oil casing when connecting the oil casing, enhance the stability of the connection between the coupling and the oil casing, and prevent the oil casing from separating from the coupling. A corrosion-resistant coating is attached to the surface of the fastening assembly 2 to prevent the fastening assembly 2 from being corroded and damaged during the long-term use of the oil casing coupling, which may interfere with the normal use of the coupling.

[0044] This specific embodiment is only an explanation of the present application and does not limit the present application. After reading this specification, those skilled in the art can make modifications to this embodiment without creative contributions as needed, but as long as they are within the scope of the claims of the present application, they are protected by the patent law.

Claims

1. A variable-diameter oil casing coupling, characterized in that: The coupling includes a pipe body (1) and a fastening assembly (2). At least three - order platforms are machined on the inner wall of the pipe body (1). The pipe body (1) includes a first insertion platform (11), a second insertion platform (12), and a third insertion platform (13). The first insertion platform (11), the second insertion platform (12), and the third insertion platform (13) can enable the coupling to connect two oil - casing pipes with different diameters. The fastening assembly (2) is arranged at the end of the inner wall of the pipe body (1), and the fastening assembly (2) can clamp and fix the oil - casing pipe.

2. The variable-diameter oil casing coupling according to claim 1, wherein: The fastening assembly (2) includes a clamping seat (21), a limiting member (22), a rotating plate (23), a clamping member (24), a driving rod (26), and a fixing plate. The clamping seat (21) is arranged at the end of the pipe body (1). The limiting member (22) is fixedly connected to the surface of the clamping seat (21). The rotating plate (23) is rotatably arranged on the surface of the clamping member (24). The clamping member (24) is hinged to the plate surface of the rotating plate (23). One end of the driving rod (26) is fixedly connected to the peripheral wall of the clamping member (24). The fixing plate is arranged on the side of the clamping member (24) away from the rotating plate (23) and is hinged to the clamping member (24). The fixing plate is fixedly connected to the rotating plate (23). A sliding groove is formed on the surface of the limiting member (22) away from the clamping seat (21). The end of the driving rod (26) away from the clamping member (24) is slidably arranged in the sliding groove.

3. The variable-diameter oil casing coupling according to claim 2, wherein: A receiving groove is formed on the surface of the limiting member (22) close to the rotating plate (23). The rotating plate (23) is adapted to the receiving groove and is slidably inserted into the receiving groove.

4. A variable-diameter oil casing coupling according to claim 2, characterized in that: A fixing groove (211) is formed on the plate surface of the clamping seat (21). The fastening assembly (2) further includes a fixing column (27). One end of the fixing column (27) is fixedly connected to the fixing plate, and the other end is slidably arranged in the fixing groove (211).

5. A variable-diameter oil casing coupling according to claim 4, characterized in that: The fastening assembly (2) further includes a spring (28). The spring (28) is arranged in the fixing groove (211). One end of the spring (28) is fixedly connected to the end of the fixing groove (211), and the other end is fixedly connected to the peripheral wall of the end of the fixing column (27).

6. The variable-diameter oil casing coupling according to claim 1, characterized in that: An insulating cavity (16) is formed inside the pipe body (1). The insulating cavity (16) is coaxially arranged with the pipe body (1).

7. A variable-diameter oil casing coupling according to claim 6, characterized in that: A plurality of reinforcing ribs (17) are arranged inside the insulating cavity (16). The plurality of reinforcing ribs (17) are evenly spaced inside the insulating cavity (16).

8. A variable-diameter oil casing coupling according to claim 6, characterized in that: An installation groove (14) is formed on the inner wall of the pipe body (1). The pipe body (1) further includes a sealing member (15). The sealing member (15) is inserted into the installation groove (14).

9. The variable-diameter oil casing coupling according to claim 2, wherein: An inner - corrosion coating is attached to the surface of the fastening assembly (2).

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