Slip hanger used for lifting resistance of wellhead device and easy to disassemble

Abstract

The invention relates to the technical field of slip hangers, in particular to a slip hanger used for well head equipment lifting resistance and easy to disassemble, which comprises a slip insert, a base and a shell, and further comprises a first supporting seat arranged in the shell, the first supporting seat is located at the top of the base, a first limiting device is arranged between the first supporting seat and the base, the first supporting seat slides relative to the base along the first limiting device, the second supporting seat is arranged in the shell and fixedly connected with the shell, the second supporting seat is located at the top of the first supporting seat, and a second limiting device is arranged between the second supporting seat and the first supporting seat. According to the technical scheme, disassembly is convenient, and the disassembly and maintenance efficiency of the slip hanger and the sleeve is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of slip hangers, and particularly to a slip hanger for preventing lifting at the wellhead device and being easily disassembled. Background Art

[0002] Casing hangers are divided into two types: slip type and mandrel type. The slip type casing hanger mainly consists of slip teeth, a slip seat, a rubber seal, and a support seat. It mainly holds the casing with a two-piece combined slip hanger, and the whole is put into the casing head hole, so that the slip teeth tightly hold the casing. Under the action of the self-weight of the casing and the taper of the slip teeth, the slip teeth are wedged tighter and tighter, making the slip teeth hold the casing tighter and tighter. And the rubber seal is deformed under its own weight to form a seal for the casing and the casing head body.

[0003] For the existing slip hanger, with the increase of the service life, the connection between the slips and the casing, and between the slip teeth and the slip housing is very tight, and it is difficult to disassemble. And under long-term corrosion, some out-of-repair slip hangers and casings have been corroded and bonded into a whole, making the slip hanger even more difficult to disassemble during the maintenance and replacement process, seriously affecting the disassembly and repair efficiency of the slip hanger and the casing.

[0004] Therefore, it is necessary to propose a slip hanger for preventing lifting at the wellhead device and being easily disassembled to facilitate the disassembly of the slip hanger and improve the repair efficiency. Summary of the Invention

[0005] The purpose of the present invention is to solve the problem that the existing slip hanger is difficult to disassemble with the increase of the service life, and now a slip hanger for preventing lifting at the wellhead device and being easily disassembled is provided. [[ID=2X]]

[0006] The technical solution of the present invention is as follows: A slip hanger for preventing lifting at the wellhead device and being easily disassembled includes slip teeth, a base, and a housing. The housing is cylindrical and is buckled on the top of the base. It also includes a first support seat placed inside the housing. The first support seat is located on the top of the base and a first limiting device is provided between them. The first support seat slides relative to the base along the first limiting device. A second support seat placed inside the housing and fixedly connected to the housing. The second support seat is located on the top of the first support seat and a second limiting device is provided between them. The second support seat slides relative to the first support seat through the second limiting device. The slip teeth are located inside the first support seat. A tightening member is provided at the top of the housing. When the tightening member presses the slip teeth, the first support seat and the second support seat provide support for the slip teeth. A first groove is formed at the outer edge of the first support seat, and a second groove is formed at the outer edge of the second support seat. The first groove and the second groove are butted to form a sealing groove for accommodating a sealing ring. The housing presses the sealing ring into the sealing groove.

[0007] Furthermore, a fixing member is provided at the top of the outer shell, and a fixing hole for accommodating the fixing member is formed at the top of the second support seat. The outer shell and the second support seat are fixedly connected through the fixing member. The fixing member is preferably a screw. The fixing member fixes the outer shell and the second support seat, enabling the outer shell and the second support seat to be connected as a whole, ensuring that the outer shell can always wrap around the outside of the first support seat and the second support seat, and guaranteeing the support of the outer shell for the second support seat and the first support seat.

[0008] Furthermore, the second limiting device includes a second limiting protrusion and a second limiting groove. The second limiting protrusion is fixedly connected to the first support seat, and the second limiting groove is located at the bottom of the second support seat. By means of their plug-in connection, on the one hand, it can meet the sliding of the second support seat relative to the first support seat, and on the other hand, it can ensure that when an upward force from the casing is received, the outer shell can rely on the gravity of the first support seat and the second support seat to overcome the upward force from the casing.

[0009] Furthermore, the top of the first support seat is an outwardly convex conical inclined surface, and the bottom of the second support seat is an inwardly concave conical inclined surface. This structural design can make the second limiting device in an inclined state. When the outer shell is taken out, the second support seat can slide radially around the first support seat along the inclined direction of the second limiting device, moving the second support seat away from the slip teeth.

[0010] Furthermore, the first limiting device includes a first limiting protrusion and a first limiting groove. The first limiting protrusion is fixedly connected to the base, and the first limiting groove is located at the bottom of the first support seat. Preferably, the first limiting groove is an annular groove, and the first limiting protrusion is an annular protrusion.

[0011] Furthermore, the bottom of the first support seat is a plane, and the top of the base is a plane, enabling the first support seat to slide relative to the base in the horizontal plane.

[0012] Furthermore, a sealing sleeve is provided at the top of the base. The sealing sleeve is located between the base and the first support seat and between the base and the outer shell. There is a gap between the first support seat and the base. To improve the sealing performance, the sealing sleeve can fill the gap and enhance the airtightness.

[0013] Furthermore, a spring is provided in the fixing hole. The fixing member is threadedly connected to the fixing hole. When the fixing member is inserted into the fixing hole, it squeezes the spring to contract and deform. The spring can exert a supporting force on the fixing member, facilitating the removal of the fixing member from the outer shell.

[0014] Furthermore, the tightening member is threadedly connected to the outer shell. A tightening head is fixedly connected to the bottom of the tightening member. The diameter of the tightening head is larger than the diameter of the tightening member. The tightening head can tighten the slip teeth, ensuring the fixation of the slip teeth and the casing.

[0015] A slip hanger for preventing the rise of a wellhead device and being easily disassembled according to the present invention. When disassembling, first disassemble and separate the outer casing from the second support base, and take out the outer casing from the well, so that the outer casing no longer provides support for the first support base and the second support base. The gap generated after the outer casing is taken out can facilitate the sliding of the second support base relative to the first support base, so that the second support base moves away from the slip teeth. At this time, the slip teeth that lose the support of the second support base can be easily removed from the casing even if they are adhered to the casing. After taking out the slip teeth from the well, since the first support base and the second support base do not directly contact the casing, they will not adhere, so it is very easy to take out the first support base and the second support base from the well. After taking them out, through the first limiting device, the first support base can slide relative to the base, thus facilitating the disassembly and separation of the first support base from the base, making the device relatively easy to disassemble; when the installation is completed, when the casing is subjected to an upward pressure, the tightening member on the outer casing can play a role in squeezing and fixing the slip teeth, preventing the slip teeth from being driven upward by the casing and ensuring the fixing effect of the slip teeth on the casing. In addition, the outer casing is fixedly connected to the second support base, the second support base is connected to the first support base through the second limiting device, and the first support base is connected to the base through the first limiting device. Therefore, when the outer casing is subjected to the upward pressure from the casing, the base, the first support base and the second support base can rely on their own gravity to make the outer casing overcome the upward pressure from the casing, ensuring the stability of the overall structure and achieving the anti-rise effect. And because there is also a gap between the first support base and the second support base, a sealing groove can be provided between them to improve the airtightness by adding a sealing ring. Compared with the traditional technology, the technical solution of the present invention is convenient for disassembly and improves the disassembly and maintenance efficiency of the slip hanger and the casing. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a sectional view of the present invention; Figure 2 is a reference view of the present invention in a disassembled state; Figure 3 is a perspective view of the first support base of the present invention; Figure 4 is a perspective Figure 1 of the second support base of the present invention; Figure 5 is a perspective Figure 2 of the second support base of the present invention.

[0017] Reference numerals: 1, slip teeth; 2, base; 3, outer casing; 4, first support base; 5, second support base; 6, spring; 7, sealing groove; 8, tightening head; 9, tightening member; 10, fixing member; 11, fixing hole; 12, second limiting protrusion; 13, second limiting groove; 14, first limiting protrusion; 15, first limiting groove; 16, sealing sleeve; 17, first groove; 18, second groove; 19, sealing ring. DETAILED DESCRIPTION OF THE INVENTION

[0018] In order to make the technical means, technical features, invention purposes and technical effects achieved by the present invention easy to understand, the present invention will be further described below with reference to specific drawings.

[0019] Embodiment 1: As Figure 1 shown, this embodiment provides a slip hanger for preventing the rise of a wellhead device and being easily disassembled, including slip teeth 1, a base 2 and a housing 3. The housing 3 is cylindrical and is buckled on the top of the base 2. It further includes a first support seat 4 placed inside the housing 3. The first support seat 4 is located on the top of the base 2 and a first limiting device is provided between the two. The first support seat 4 slides relative to the base 2 along the first limiting device. A second support seat 5 placed inside the housing 3 and fixedly connected to the housing 3. The second support seat 5 is located on the top of the first support seat 4 and a second limiting device is provided between the two. The second support seat 5 slides relative to the first support seat 4 through the second limiting device. The slip teeth 1 are located inside the first support seat 4. A tightening member 9 is provided at the top of the housing 3. When the tightening member 9 presses the slip teeth 1, the first support seat 4 and the second support seat 5 provide support for the slip teeth 1. As Figure 3 and Figure 4 shown, a first groove 17 is opened at the outer edge of the first support seat 4, and a second groove 18 is opened at the outer edge of the second support seat 5. The first groove 17 and the second groove 18 are butted to form a sealing groove 7 for accommodating a sealing ring 19. The housing 3 presses the sealing ring 19 into the sealing groove 7. Since there is also a gap between the first support seat 4 and the second support seat 5, setting the sealing groove 7 between the two can improve the airtightness by adding the sealing ring 19.

[0020] Preferably, as Figure 1 shown, a fixing member 10 is provided at the top of the housing 3, and a fixing hole 11 for accommodating the fixing member 10 is opened at the top of the second support seat 5. The housing 3 and the second support seat 5 are fixedly connected through the fixing member 10. The fixing member 10 is preferably a screw. The fixing member 10 fixes the housing 3 and the second support seat 5, which can connect the housing 3 and the second support seat 5 into a whole, so that the housing 3 can always wrap the first support seat 4 and the second support seat 5 on the outside, ensuring the support of the housing 3 for the second support seat 5 and the first support seat 4. At the same time, the screw is also convenient for disassembly. Four to eight screws are provided on the housing 3, preferably four, and they are symmetrically arranged about the axis of the housing 3. The number of the fixing holes 11 corresponds to that of the fixing members 10.

[0021] Preferably, as Figure 3 and Figure 5As shown, the second limiting device includes a second limiting protrusion 12 and a second limiting groove 13. The second limiting protrusion 12 is fixedly connected or welded to the first support base 4 by screws. The second limiting groove 13 is located at the bottom of the second support base 5. Through the insertion connection method of the two, on the one hand, it can meet the sliding of the second support base 5 relative to the first support base 4, and on the other hand, it can ensure that when receiving an upward force from the casing, the outer shell 3 can overcome the upward force from the casing by relying on the gravity of the first support base 4 and the second support base 5.

[0022] Preferably, as Figure 3 and Figure 5 shown, the top of the first support base 4 is an outwardly convex conical inclined surface, and the bottom of the second support base 5 is an inwardly concave conical inclined surface. This structural design can make the second limiting device in an inclined state. When removing the outer shell 3, the second support base 5 can slide in a divergent shape around the first support base 4 along the inclined direction of the second limiting device, so that the second support base 5 moves away from the slip teeth 1.

[0023] Preferably, as Figure 3 and Figure 4 shown, the first limiting device includes a first limiting protrusion 14 and a first limiting groove 15. The first limiting protrusion 14 is fixedly connected to the base 2, and the first limiting groove 15 is located at the bottom of the first support base 4. Preferably, the first limiting groove 15 is an annular groove, and the first limiting protrusion 14 is an annular protrusion.

[0024] Preferably, as Figure 3 and Figure 4 shown, the bottom of the first support base 4 is a plane, and the top of the base 2 is a plane, realizing that the first support base 4 can slide relative to the base 2 in the horizontal plane.

[0025] Preferably, as Figure 1 , a sealing sleeve 16 is provided on the top of the base 2. The sealing sleeve 16 is located between the base 2 and the first support base 4 and between the base 2 and the outer shell 3. There is a gap between the first support base 4 and the base 2. To improve the sealing performance, the sealing sleeve 16 can fill the gap and improve the airtightness.

[0026] Preferably, as Figure 1 , a spring ⑥ is provided in the fixing hole 11. The fixing member ⑩ is threadedly connected to the fixing hole 11. When the fixing member ⑩ is inserted into the fixing hole 11, it squeezes the spring ⑥ to contract and deform. The spring ⑥ can exert a supporting force on the fixing member ⑩, facilitating the removal of the fixing member ⑩ from the outer shell 3.

[0027] Preferably, as Figure 1 , the tightening member ⑨ is threadedly connected to the outer shell 3. A tightening head ⑧ is fixedly connected to the bottom of the tightening member ⑨. The diameter of the tightening head ⑧ is larger than the diameter of the tightening member ⑨. The tightening head ⑧ can tighten the slip teeth 1 to ensure the fixation of the slip teeth 1 and the casing.

[0028] Preferably, the base 2 is evenly divided into four sector parts, and the four parts form a complete base 2. As Figure 3 shown, the first support base 4 matches the base 2 and is also composed of four parts. Between each part of the first support base 4 and the base 2, a first limiting device is provided. First, connect each part of the base 2 and the first support base 4 through the first limiting device, and then connect and fix the adjacent parts of the base 2 through screws, so as to piece together a complete base 2 and the first support base 4. The second support base 5 is also spliced by four identical sector parts and matches the first support base 4.

[0029] During use, when disassembling, as Figure 2 shown, first disassemble and separate the outer shell 3 from the second support base 5, and take out the outer shell 3 from the well, so that the outer shell 3 no longer provides support for the first support base 4 and the second support base 5. The sealing ring 16 is mostly made of materials such as rubber or nylon, and its own deformation can be used to facilitate manual disassembly. Then, using the gap generated after disassembling the outer shell 3 and the sealing ring 16, it is convenient for the second support base 5 to slide relative to the first support base 4, so that the second support base 5 moves away from the slip teeth 1. At this time, the slip teeth 1 without the support of the second support base 5 can be easily removed from the casing even if they are adhered to the casing. After taking out the slip teeth 1 from the well, since the first support base 4 and the second support base 5 do not directly contact the casing, they will not adhere, so it is very easy to take out the first support base 4 and the second support base 5 from the well. After taking them out, through the first limiting device, the first support base 4 can slide relative to the base 2, so as to facilitate the disassembly and separation of the first support base 4 and the base 2, making the device easier to disassemble; when installing, first connect the base 2 and the first support base 4 through the first limiting device, and the first support base 4 is connected to the second support base 5 through a second limiting device above. The slip teeth 1 are placed inside the second support base 5, and finally the outer shell 3 is threadedly connected to the second support base 5 to fix the whole. Then, put the whole into the well and adjust the tightening member to press the slip teeth. When the casing is subjected to an upward pressure, the tightening member 9 on the outer shell 3 can play a role in squeezing and fixing the slip teeth 1 to prevent the slip teeth 1 from being driven up by the casing and ensure the fixing effect of the slip teeth 1 on the casing. In addition, the outer shell 3 is fixedly connected to the second support base 5, the second support base 5 is connected to the first support base 4 through the second limiting device, and the first support base 4 is connected to the base 2 through the first limiting device. Therefore, when the outer shell 3 is subjected to the upward pressure from the casing, the base 2, the first support base 4 and the second support base 5 can rely on their own gravity to make the outer shell 3 overcome the upward pressure from the casing and ensure the stability of the overall structure, playing a role in preventing upward movement. Compared with the traditional technology, the technical solution of the present invention is convenient for disassembly and improves the disassembly and maintenance efficiency of the slip hanger and the casing.

[0030] The above are only the preferred embodiments of the present invention and are not intended to limit the scope of implementation of the present invention. That is, all equivalent changes and modifications made to the content within the scope of the patent application of the present invention shall fall within the technical scope of the present invention.

Claims

1. A slip hanger for preventing the rise of a wellhead device and being easily disassembled, comprising slip teeth (1), a base (2) and a housing (3), characterized in that: The outer shell (3) is cylindrical and is inverted on the top of the base (2), and further includes, A first support seat (4) placed inside the outer shell (3), the first support seat (4) is located on the top of the base (2) and a first limiting device is provided between them, and the first support seat (4) slides relative to the base (2) along the first limiting device; A second support seat (5) placed inside the outer shell (3) and fixedly connected to the outer shell (3), the second support seat (5) is located on the top of the first support seat (4) and a second limiting device is provided between them, and the second support seat (5) slides relative to the first support seat (4) through the second limiting device; The slip teeth (1) are located inside the first support seat (4), and a tightening member (9) is provided at the top of the outer shell (3). When the tightening member (9) presses the slip teeth (1), the first support seat (4) and the second support seat (5) provide support for the slip teeth (1); A first groove (17) is formed at the outer edge of the first support seat (4), and a second groove (18) is formed at the outer edge of the second support seat (5). The first groove (17) and the second groove (18) are butted to form a sealing groove (7) for accommodating the sealing ring (19), and the outer shell (3) presses the sealing ring (19) into the sealing groove (7).

2. The slip hanger for preventing lifting and being easily disassembled of the wellhead device according to claim 1, wherein: A fixing member (10) is provided at the top of the outer shell (3), and a fixing hole (11) for accommodating the fixing member (10) is formed at the top of the second support seat (5). The outer shell (3) and the second support seat (5) are fixedly connected through the fixing member (10).

3. The slip hanger for preventing upward movement and being easily disassembled of the wellhead device according to claim 1, wherein: The second limiting device includes a second limiting protrusion (12) and a second limiting groove (13). The second limiting protrusion (12) is fixedly connected to the first support seat (4), and the second limiting groove (13) is located at the bottom of the second support seat (5).

4. The slip hanger for preventing upward movement and being easily disassembled of the wellhead device according to claim 3, wherein: The top of the first support seat (4) is a convex conical inclined surface, and the bottom of the second support seat (5) is a concave conical inclined surface.

5. The slip hanger for preventing upward movement and being easily disassembled of the wellhead device according to claim 1, wherein: The first limiting device includes a first limiting protrusion (14) and a first limiting groove (15). The first limiting protrusion (14) is fixedly connected to the base (2), and the first limiting groove (15) is located at the bottom of the first support seat (4).

6. The slip hanger for preventing upward movement and being easily disassembled of the wellhead device according to claim 5, characterized in that: The bottom of the first support seat (4) is a plane, and the top of the base (2) is a plane.

7. The slip hanger for preventing upward movement and being easily disassembled of the wellhead device according to claim 6, wherein: A sealing sleeve (16) is provided at the top of the base (2), and the sealing sleeve (16) is located between the base (2) and the first support seat (4) and between the base (2) and the outer shell (3).

8. The slip hanger for preventing lifting and being easily disassembled of the wellhead device according to claim 2, characterized in that: A spring (6) is provided in the fixing hole (11). The fixing member (10) is threadedly connected to the fixing hole (11). When the fixing member (10) is inserted into the fixing hole (11), it presses the spring (6) to contract and deform.

9. The slip hanger for preventing upward movement and being easily disassembled of the wellhead device according to claim 1, wherein: The tightening member (9) is threadedly connected to the outer shell (3). A tightening head (8) is fixedly connected to the bottom of the tightening member (9), and the diameter of the tightening head (8) is larger than the diameter of the tightening member (9).

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