Hanger for casing head of oil production wellhead device

Abstract

The utility model relates to the technical field of hangers, in particular to a hanger for a casing head of an oil extraction wellhead device, which comprises a hanger main body, an upper connecting part is arranged on the hanger main body, a side friction pad is arranged on an elastic plate, and a balancing weight is arranged on the bottom surface of the upper connecting part; the device has the beneficial effects that the balancing weight always applies downward force to the push block under the action of gravity, the push block extrudes the elastic plate to deform the elastic plate to be close to the inner wall of the casing head, and the side friction pad is in contact with the inner wall and deforms, so that the hanger main body is locked on the casing head; the threaded end of the top joint is screwed into the threaded hole in the upper connecting part and pulls the upper connecting part upwards, the balancing weight pulls the push block to move upwards to be separated from the elastic plate to enable the elastic plate to restore to the original shape, and the side friction pad is away from the inner wall of the casing head to be unlocked; the hanger is simple in structure, low in cost, easy and convenient to disassemble and convenient for personnel to use.

Description

Technical Field

[0001] The utility model relates to the field of hangers, in particular to a hanger for a casing head of an oil wellhead device. Background Art

[0002] The casing head hanger is a crucial component in the wellhead assembly. Its primary function is to suspend the casing string and ensure its correct positioning and sealing at the wellhead. The hanger's design allows the casing to withstand the downhole weight while maintaining a good seal to prevent oil and gas leakage and groundwater intrusion.

[0003] In the prior art, the top coupling is threadedly connected to the upper connection part of the hanger, and the lower connection part of the hanger is threadedly connected to the oil layer casing. The hanger and the oil layer casing are lowered into the casing head through the top coupling, and then the threads of the top coupling and the upper connection part of the hanger are rotated to loosen and withdraw. If the hanger rotates, the threads of the hanger and the oil layer casing will become loose. In order to prevent the hanger from rotating, an anti-reversal device is provided on the hanger.

[0004] However, the device for preventing the hanger from rotating is complicated in structure, has high cost, and has a complicated and tedious disassembly process. It is not easy to operate, has low practicality, and is inconvenient for staff to use. Utility Model Content

[0005] The purpose of the utility model is to provide a hanger for a casing head of an oil wellhead device, so as to solve the problems raised in the above background technology.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solution: a hanger for a casing head of an oil wellhead device, comprising a hanger body, an upper connecting part and an elastic plate provided on the hanger body, a side friction pad provided on the elastic plate, a counterweight block provided on the bottom surface of the upper connecting part, a plurality of connecting rods provided on the bottom surface of the counterweight block, a push block provided on the bottom surface of the connecting rod, and a tension spring provided on the side surface of the push block.

[0007] Preferably, the side friction pad is a square plate structure, the side friction pad is fixedly connected to the elastic plate, the elastic plate is fixedly connected to the hanger body, and a card slot is provided at the bottom of the hanger body.

[0008] Preferably, the counterweight block is fixedly connected to the upper connecting portion, and a plurality of anti-slip pads are fixedly connected to the side surfaces of the upper connecting portion, and the anti-slip pads are in a square plate-shaped structure.

[0009] Preferably, the connecting rod is fixedly connected to the counterweight block, and the side of the counterweight block is fixedly connected to the limit block, which is a square plate structure. The limit block is stuck in the limit groove opened on the side of the hanger body, and the limit block can slide along the limit groove.

[0010] Preferably, the push block is fixedly connected to the connecting rod, a connecting plate is fixedly connected to the side of the push block, a tension spring is fixedly connected to the connecting plate, and the other end of the tension spring is fixedly connected to the hanger body.

[0011] Preferably, the slot is an annular slot structure, a lower friction pad is provided in the slot, the lower friction pad is an annular plate structure, the lower friction pad is fixedly connected to the hanger body, and the bottom of the hanger body is fixedly connected with a lower connecting part.

[0012] Compared with the prior art, the beneficial effects of the present invention are:

[0013] The utility model discloses a hanger for the casing head of an oil wellhead device. During the process of rotating the coupling top section, the counterweight block always gives the push block a downward thrust under the action of gravity. The inclined surface of the push block squeezes the elastic plate to deform it and make it close to the inner wall of the casing head. The side friction pad contacts the inner wall and deforms, locking the hanger body on the casing head. This can prevent the hanger body from rotating with the coupling top section and thus loosening the threads of the hanger body and the oil layer casing. The threaded end on the coupling top section is screwed into the threaded hole provided on the upper connecting part, the coupling top section pulls the upper connecting part upward, the counterweight block moves upward to make the push block move upward, the push block is separated from the elastic plate to restore it to its original shape, the side friction pad is released away from the inner wall of the casing head, and the coupling top section continues to move upward to pull out the hanger body. The utility model has the advantages of simple structure, low cost, simple disassembly process and convenient actual use by staff. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the structure of the utility model;

[0015] Figure 2 It is a schematic diagram of the local structure of the utility model;

[0016] Figure 3 for Figure 2 A in the middle is an enlarged structural diagram;

[0017] Figure 4 for Figure 2 Enlarged structural diagram at point B in the middle.

[0018] In the figure: 1. hanger body; 2. lower connecting part; 3. upper connecting part; 4. anti-slip pad; 5. counterweight; 6. connecting rod; 7. push block; 8. connecting plate; 9. tension spring; 10. elastic plate; 11. side friction pad; 12. limit groove; 13. limit block; 14. slot; 15. lower friction pad. DETAILED DESCRIPTION

[0019] In order to clearly and completely describe the purpose and technical solution of the present invention and make its advantages more clearly understood, the following is a further detailed description of the embodiments of the present invention in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only part of the embodiments of the present invention, not all of them, and are only used to explain the embodiments of the present invention and are not intended to limit the embodiments of the present invention. All other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0020] Example 1

[0021] See also Figures 1-4 The utility model provides a technical solution: a hanger for a casing head of an oil wellhead device, comprising a hanger body 1, an upper connecting portion 3 and an elastic plate 10 provided on the hanger body 1, a side friction pad 11 provided on the elastic plate 10, a counterweight 5 provided on the bottom surface of the upper connecting portion 3, a plurality of connecting rods 6 provided on the bottom surface of the counterweight 5, a push block 7 provided on the bottom surface of the connecting rod 6, and a tension spring 9 provided on the side surface of the push block 7;

[0022] During specific use, the coupling joint is threadedly connected to the thread in the upper connecting part 3, and the upper connecting part 3 and the hanger body 1 are lowered into the casing head through the coupling joint. During the process of screwing out the coupling joint, the counterweight block 5 always gives a downward thrust to the connecting rod 6 and the push block 7 under the action of gravity, and the push block 7 squeezes the elastic plate 10 so that the side friction pad 11 fixedly connected to the elastic plate 10 contacts the inner wall of the casing head. The side friction pad 11 can prevent the hanger body 1 from rotating with the coupling joint, thereby preventing the hanger body 1 and the oil layer casing threads from loosening.

[0023] Example 2

[0024] On the basis of embodiment 1, in order to improve the use effect of the device, a push block 7 is provided, the push block 7 is fixedly connected to the connecting rod 6, the side of the push block 7 is fixedly connected to a connecting plate 8, the connecting plate 8 is fixedly connected to a tension spring 9, the other end of the tension spring 9 is fixedly connected to the hanger body 1, the hanger body 1 is lowered into the casing head through the top joint, and in the process of rotating the top joint, the counterweight block 5 always gives a downward thrust to the connecting rod 6 and the push block 7 under the action of gravity, and cooperates with the tension spring 9 to pull the connecting plate 8 to give the push block 7 a downward force, and the side friction pad 11 is a square plate structure. The pad 11 is fixedly connected to the elastic plate 10, and the elastic plate 10 is fixedly connected to the hanger body 1. A card slot 14 is provided at the bottom of the hanger body 1. The push block 7 is pressed against the elastic plate 10 by the inclined surface, so that the elastic plate 10 is deformed and close to the inner wall of the casing head, so that the side friction pad 11 fixedly connected to the elastic plate 10 contacts the inner wall of the casing head and deforms, so that the hanger body 1 is in close contact with the casing head. Fixing the hanger body 1 on the casing head can effectively prevent the hanger body 1 from rotating with the landing joint, thereby preventing the threads of the hanger body 1 and the oil layer casing from loosening, thereby improving the stability of the device.

[0025] The clamping groove 14 is an annular groove structure, and a lower friction pad 15 is provided in the clamping groove 14. The lower friction pad 15 is an annular plate structure. The lower friction pad 15 is fixedly connected to the hanger body 1. The lower connecting portion 2 is fixedly connected to the bottom of the hanger body 1. The lower friction pad 15 is in contact with the casing head. The lower friction pad 15 can further increase the friction coefficient between the hanger body 1 and the casing head, preventing the hanger body 1 from rotating with the rotation of the coupling head, thereby improving the stability of the device.

[0026] The connecting rod 6 is fixedly connected to the counterweight 5, and the side of the counterweight 5 is fixedly connected to the limit block 13. The limit block 13 is a square plate structure. The limit block 13 is stuck in the limit groove 12 opened on the side of the hanger body 1. The limit block 13 can slide along the limit groove 12. When the hanger body 1 is taken out from the casing head, the threaded end on the top section is screwed into the threaded hole opened on the upper connecting part 3, so that the top section moves upward and pulls the upper connecting part 3, so that the counterweight 5 and the limit block 13 move along the hanger body. The limiting groove 12 on the side of the cam 1 moves upward, so that the connecting rod 6 and the push block 7 move upward, so that the push block 7 is separated from the elastic plate 10. The elastic plate 10 is restored, so that the side friction pad 11 fixedly connected to the elastic plate 10 is away from the inner wall of the casing head, so that the hanger body 1 and the casing head are no longer in close contact. The top joint moves upward, and the hanger body 1 and the oil layer casing threadedly connected to the lower connecting part 2 can be pulled out. The structure is simple, the cost is low, the disassembly process is simple, and it is convenient for the staff to actually use it.

[0027] Example 3

[0028] On the basis of Example 2, a counterweight block 5 is provided for the convenience of the staff in actual use. The counterweight block 5 is fixedly connected to the upper connecting part 3. Several anti-slip pads 4 are fixedly connected to the side of the upper connecting part 3. The anti-slip pads 4 are square plate-shaped structures. When the staff connects the upper connecting part 3 to the connecting top section with threads, the upper connecting part 3 needs to be rotated. The several anti-slip pads 4 provided on the upper connecting part 3 can prevent the staff from slipping when rotating the upper connecting part 3, so that the staff can install the upper connecting part 3 and the hanger body 1 on the connecting top section, which is convenient for the staff to actually use.

[0029] When the cam 11 is in the process of being rotated out, the cam 11 is in the process of being rotated out, and the cam 11 is in the process of being rotated out, so that the cam 11 is in the process of being rotated out, and the cam 11 is in the process of being rotated out, so that the cam 11 is in the process of being rotated out, and the cam 11 is in the process of being rotated out, so that the cam 11 is in the process of being rotated out, and the cam 11 is in the process of being rotated out, so that the cam 11 is in the process of being rotated out, and the cam 11 is in the process of being rotated out, so that the cam 11 is in the process of being rotated out, and the cam 11 is in the process of being rotated out, so that the cam 11 is in the process of being rotated out

[0030] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A hanger for a casing head of an oil wellhead device, comprising a hanger body (1), an upper connecting portion (3) and an elastic plate (10) provided on the hanger body (1), a side friction pad (11) provided on the elastic plate (10), characterized in that: The bottom surface of the upper connecting part (3) is provided with a counterweight block (5), the bottom surface of the counterweight block (5) is provided with a plurality of connecting rods (6), the bottom surface of the connecting rods (6) is provided with a push block (7), and the side surface of the push block (7) is provided with a tension spring (9).

2. The hanger for a casing head of an oil wellhead device according to claim 1, characterized in that: The side friction pad (11) is a square plate-shaped structure. The side friction pad (11) is fixedly connected to the elastic plate (10). The elastic plate (10) is fixedly connected to the hanger body (1). A card slot (14) is provided at the bottom of the hanger body (1).

3. The hanger for a casing head of an oil wellhead device according to claim 1, characterized in that: The counterweight block (5) is fixedly connected to the upper connecting portion (3), and a plurality of anti-slip pads (4) are fixedly connected to the side of the upper connecting portion (3), and the anti-slip pads (4) are in a square plate-shaped structure.

4. The hanger for a casing head of an oil wellhead device according to claim 1, characterized in that: The connecting rod (6) is fixedly connected to the counterweight (5), and the side of the counterweight (5) is fixedly connected to a limit block (13), which is a square plate-shaped structure. The limit block (13) is stuck in a limit groove (12) opened on the side of the hanger body (1), and the limit block (13) can slide along the limit groove (12).

5. The hanger for a casing head of an oil wellhead device according to claim 1, characterized in that: The push block (7) is fixedly connected to the connecting rod (6); a connecting plate (8) is fixedly connected to the side of the push block (7); a tension spring (9) is fixedly connected to the connecting plate (8); and the other end of the tension spring (9) is fixedly connected to the hanger body (1).

6. The hanger for a casing head of an oil wellhead device according to claim 2, characterized in that: The clamping groove (14) is in an annular groove structure. A lower friction pad (15) is provided in the clamping groove (14). The lower friction pad (15) is in an annular plate structure. The lower friction pad (15) is fixedly connected to the hanger body (1). The bottom of the hanger body (1) is fixedly connected to a lower connecting portion (2).

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