High-leakproofness leakproof casing head for oil field wellhead

Abstract

The utility model discloses a high leakproofness leakproof casing head for an oil field wellhead, which belongs to the technical field of oil well casing heads, and comprises a casing head main body and a connecting pipe, the casing head main body and the connecting pipe are in bolted connection, sealing assemblies are arranged in the opposite sides of the casing head main body and the connecting pipe, and the sealing assemblies are connected with the casing head main body and the connecting pipe. The surface of the sealing assembly is in close contact with the casing head main body and the inner wall of the connecting pipe; the sealing assembly comprises a sealing ring, and the sealing ring is located between the opposite sides of the casing head body and the connecting pipe, so that the problem that after an existing casing head for an oil field wellhead is connected with an inlet and a Christmas tree, abrasion is generated between the casing head and the Christmas tree connecting pipe when vibration is generated during work of an oil pumping pipe in the later period of an oil well is solved; therefore, the service life of the sealing structure between the casing head and the Christmas tree is prolonged, the sealing performance is reduced, and the using effect is affected.

Description

Technical Field

[0001] The utility model relates to the technical field of oil well casing heads, in particular to a high-sealing anti-leakage casing head used for an oil field wellhead. Background Art

[0002] The casing head is used to fix the wellhead of the drilled well, connect the wellhead casing string, support the gravity of the technical casing and the oil layer casing, seal the annular space between the layers of pipes, provide a transition connection for the installation of the blowout preventer, tubing head, and Christmas tree, and through the two side ports on the casing head body, operations such as squeezing mud, monitoring and adding balancing fluid can be carried out.

[0003] However, after the existing casing head used in the oil field wellhead is connected to the inlet and the Christmas tree, the vibration generated by the oil well pumping pipe in the later stage will cause wear between the casing head and the Christmas tree connecting pipe, thereby shortening the service life of the sealing structure between the casing head and the Christmas tree and reducing the sealing performance. Utility Model Content

[0004] The utility model provides a high-sealing anti-leakage casing head for an oilfield wellhead, aiming to solve the problem that after the existing casing head for the oilfield wellhead is connected with the inlet and the Christmas tree, due to the vibration generated by the late oil well pumping pipe operation, the casing head and the Christmas tree connecting pipe will be worn, thereby shortening the service life of the sealing structure between the casing head and the Christmas tree, reducing the sealing performance, and thus affecting the use effect.

[0005] The utility model is realized as follows: a high-sealability anti-leakage casing head for oilfield wellheads comprises a casing head body and a connecting pipe, the casing head body and the connecting pipe are bolted together, the casing head body and the connecting pipe are provided with sealing components inside the opposite sides, and the surfaces of the sealing components are in close contact with the inner walls of the casing head body and the connecting pipe respectively;

[0006] The sealing assembly includes a sealing ring, which is located between the opposite sides of the casing head body and the connecting tube, and the surfaces of the sealing ring are tightly fitted with the inner walls of the casing head body and the connecting tube respectively. The top and bottom of the sealing ring are provided with a plurality of penetration members, and a moving rod is connected to the side of the penetration member away from the sealing ring, and a spring is connected to the side of the moving rod away from the penetration member, and the side of the spring close to the casing head body and the inner wall of the connecting tube are in contact with the two respectively.

[0007] In order to achieve the effect of increasing the connection strength between the sealing assembly and the casing head body and the connecting pipe, a high-sealing and leak-proof casing head for oil field wellhead is preferred as the utility model. The interiors of the casing head body and the connecting pipe on the opposite sides are provided with connecting grooves for use with the penetrating parts, and the penetrating parts are annularly arranged on the top and bottom of the sealing ring, respectively. The surface of the penetrating parts is sleeved with protrusions, and the surfaces of the protrusions are respectively fitted with the inner walls of the casing head body and the connecting pipe.

[0008] In order to achieve the effect that the protrusion is used in conjunction with the casing head body and the connecting pipe respectively, as a preferred embodiment of the utility model, a high-sealing and leak-proof casing head for oil field wellheads is provided in the inner walls of the casing head body and the connecting pipe with a check groove used in conjunction with the protrusion, and the check groove is connected to the connecting groove.

[0009] In order to achieve the effect of connecting the moving rod with the deep-penetrating member and making the moving rod cooperate with the spring, a high-sealing and leak-proof casing head for oil field wellhead is preferably used in the utility model. One side of the deep-penetrating member and the moving rod is provided with a connecting plate, and the top connecting plate is connected to the deep-penetrating member, and the bottom connecting plate is in contact with the spring.

[0010] In order to achieve the effect of limiting the position of the spring, as a preferred embodiment of the utility model of a highly sealed anti-leakage casing head for an oil field wellhead, the casing head body and the connecting pipe are both provided with fixing grooves inside, and the spring is located inside the fixing grooves.

[0011] In order to further improve the sealing effect between the casing head body and the connecting pipe, as a preferred embodiment of the utility model, a high-sealing and leak-proof casing head for oil field wellhead is provided with two connecting rings on the top and bottom of the sealing ring, and the casing head body and the connecting pipe are both provided with sealing grooves for use with the connecting rings, and the surface of the connecting ring is tightly fitted with the inner wall of the sealing groove.

[0012] In order to achieve the effect of improving the wear resistance of the sealing component, as a preferred embodiment of the utility model for a high-sealing anti-leakage casing head used for an oil field wellhead, the sealing ring, the penetration piece, the connecting ring and the protrusion are all made of polyurethane rubber material.

[0013] Compared with the prior art, the beneficial effects of the utility model are:

[0014] The high-sealability and leak-proof casing head used for oilfield wellheads is provided with a sealing component, which can respectively connect with the inside of the casing head body and the connecting pipe through a deep-penetrating piece, thereby improving the connectivity between the sealing ring and the casing head body and the connecting pipe, thereby ensuring the use position of the sealing ring. At the same time, when the two sealing rings are in contact, the moving rod is driven to move and the spring is compressed, thereby playing a buffering role when the connecting pipe of the oil tree is connected to the casing head body when the oil tree is installed, and reducing the wear between the casing head body and the connecting pipe of the oil tree when the pumping pipe generates vibration during operation in the later stage, thereby improving the service life of the sealing component and achieving the effect of high-sealability and leak-proofing. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is the overall structural diagram of the high-sealability anti-leakage casing head used for oil field wellheads of the utility model;

[0016] Figure 2 It is a partial connection diagram of the casing head body and the connecting pipe in the utility model;

[0017] Figure 3 It is a partial connection diagram of the sealing assembly and the casing head in the utility model;

[0018] Figure 4 For this utility model Figure 3 The enlarged schematic diagram of point A in the middle;

[0019] Figure 5 For this utility model Figure 3 A magnified schematic diagram of point B in the middle.

[0020] In the figure, 1, casing head body; 2, connecting pipe; 3, sealing assembly; 301, sealing ring; 302, penetration piece; 303, moving rod; 304, spring; 4, connecting groove; 5, protrusion; 6, check groove; 7, connecting plate; 8, fixing groove; 9, connecting ring; 10, sealing groove. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0022] In the description of the present invention, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, in the description of the present invention, "multiple" means two or more, unless otherwise clearly and specifically defined.

[0023] See also Figure 1-5 The utility model provides a technical solution: a high-seal anti-leakage casing head for oilfield wellheads, comprising a casing head body 1 and a connecting pipe 2, the casing head body 1 and the connecting pipe 2 are bolted together, and sealing components 3 are arranged inside the casing head body 1 and the connecting pipe 2 on opposite sides, and the surfaces of the sealing components 3 are in close contact with the inner walls of the casing head body 1 and the connecting pipe 2 respectively;

[0024] The sealing assembly 3 includes a sealing ring 301, which is located between the opposite sides of the casing head body 1 and the connecting tube 2, and the surfaces of the sealing ring 301 are tightly fitted with the inner walls of the casing head body 1 and the connecting tube 2 respectively. The top and bottom of the sealing ring 301 are provided with a plurality of penetrating members 302, and the side of the penetrating member 302 away from the sealing ring 301 is connected to a moving rod 303, and the side of the moving rod 303 away from the penetrating member 302 is connected to a spring 304, and the side of the spring 304 close to the casing head body 1 and the inner wall of the connecting tube 2 are in contact with both.

[0025] In this embodiment: by setting the sealing assembly 3, the deep-penetrating member 302 can be used to respectively penetrate the inside of the casing head body 1 and the connecting pipe 2, so as to improve the connectivity between the sealing ring 301 and the casing head body 1 and the connecting pipe 2, thereby ensuring the use position of the sealing ring 301. At the same time, when the two sealing rings 301 are in contact, the moving rod 303 is driven to move and the spring 304 is compressed, so as to play a buffering role when the connecting pipe 2 of the Christmas tree is connected to the casing head body 1 when the Christmas tree is installed, and can reduce the wear between the casing head body 1 and the connecting pipe 2 of the Christmas tree when the pumping pipe generates vibration during operation in the later stage, thereby improving the service life of the sealing assembly 3 and achieving the effect of high sealing and leakage prevention.

[0026] As a technical optimization solution of the utility model, connecting grooves 4 for use with the penetrating member 302 are provided inside the opposite sides of the casing head body 1 and the connecting tube 2, and the penetrating member 302 is annularly arranged at the top and bottom of the sealing ring 301 respectively, and a protrusion 5 is sleeved on the surface of the penetrating member 302, and the surfaces of the protrusion 5 are respectively fitted with the inner walls of the casing head body 1 and the connecting tube 2.

[0027] In this embodiment, by providing the connection groove 4, the penetrating member 302 can be located inside the casing head body 1 and the connecting pipe 2 respectively, and by providing the protrusion 5, the position of the penetrating member 302 can be restricted.

[0028] As a technical optimization solution of the utility model, the inner walls of the casing head body 1 and the connecting pipe 2 are both provided with a non-return groove 6 used in conjunction with the protrusion 5 , and the non-return groove 6 is connected to the connecting groove 4 .

[0029] In this embodiment, the anti-return groove 6 is provided to achieve the effect of being used in conjunction with the protrusion 5 .

[0030] As a technical optimization solution of the utility model, a connecting plate 7 is provided on one side of the penetrating member 302 and the moving rod 303 , and the top connecting plate 7 is connected to the penetrating member 302 , and the bottom connecting plate 7 is in contact with the spring 304 .

[0031] In this embodiment, by providing the connecting plate 7, the moving rod 303 can be connected to the penetrating member 302, and the spring 304 can be connected to the moving rod 303.

[0032] As a technical optimization solution of the present invention, a fixing groove 8 is provided inside the casing head body 1 and the connecting pipe 2 , and the spring 304 is located inside the fixing groove 8 .

[0033] In this embodiment, by providing the fixing groove 8, the effect of limiting the use position of the spring 304 can be achieved.

[0034] As a technical optimization solution of the utility model, two connecting rings 9 are provided on the top and bottom of the sealing ring 301, and sealing grooves 10 for use with the connecting rings 9 are opened inside the casing head body 1 and the connecting pipe 2, and the surface of the connecting ring 9 is tightly fitted with the inner wall of the sealing groove 10.

[0035] In this embodiment, the connection ring 9 and the sealing groove 10 are used in combination to further improve the sealing performance between the casing head body 1 and the connection pipe 2 .

[0036] As a technical optimization solution of the present invention, the sealing ring 301, the penetration piece 302, the connecting ring 9 and the protrusion 5 are all made of polyurethane rubber material.

[0037] In this embodiment, the sealing ring 301, the penetration member 302, the connecting ring 9 and the protrusion 5 are all made of polyurethane rubber material, so that the wear resistance of the sealing component 3 can be improved.

[0038] Working principle: First, the connecting pipe 2 is integrally arranged with the Christmas tree. Therefore, when the connecting pipe 2 of the Christmas tree is connected to the casing head body 1, the two sealing rings 301 will come into contact, driving the moving rod 303 to move and compressing the spring 304, which can play a buffering role when the connecting pipe 2 of the Christmas tree is connected to the casing head body 1 when the Christmas tree is installed, and under the action of pressure, the protrusion 5 is deformed by force and enters the inside of the non-return groove 6, and the connecting ring 9 enters the inside of the sealing groove 10, so as to strengthen the sealing of the connection. Therefore, when the pumping pipe generates vibration during operation, the wear between the casing head body 1 and the Christmas tree connecting pipe 2 can be reduced, the service life of the sealing component 3 is increased, and the effect of high sealing and leakage prevention is achieved.

[0039] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A highly leak-proof casing head for oilfield wellheads, comprising a casing head body (1) and a connecting pipe (2), characterized in that: The casing head body (1) and the connecting pipe (2) are bolted together, and sealing components (3) are arranged inside the casing head body (1) and the connecting pipe (2) on opposite sides, and the surfaces of the sealing components (3) are in close contact with the inner walls of the casing head body (1) and the connecting pipe (2) respectively; The sealing assembly (3) comprises a sealing ring (301), the sealing ring (301) being located between opposite sides of the casing head body (1) and the connecting tube (2), and the surface of the sealing ring (301) being tightly fitted with the inner walls of the casing head body (1) and the connecting tube (2), respectively; a plurality of penetration members (302) are provided at the top and bottom of the sealing ring (301), and a moving rod (303) is connected to the side of the penetration member (302) away from the sealing ring (301), a spring (304) is connected to the side of the moving rod (303) away from the penetration member (302), and the side of the spring (304) close to the inner wall of the casing head body (1) and the connecting tube (2) is in contact with both.

2. The high-sealability anti-leakage casing head for oil field wellhead according to claim 1, characterized in that: The insides of the sleeve head body (1) and the connecting pipe (2) on the opposite sides are both provided with connecting grooves (4) for use with the penetrating member (302), and the penetrating member (302) is annularly arranged on the top and bottom of the sealing ring (301), and the surface of the penetrating member (302) is sleeved with a protrusion (5), and the surface of the protrusion (5) is respectively in contact with the inner wall of the sleeve head body (1) and the connecting pipe (2).

3. The high-sealability anti-leakage casing head for oil field wellhead according to claim 2, characterized in that: The inner walls of the casing head body (1) and the connecting pipe (2) are both provided with a non-return groove (6) used in conjunction with the protrusion (5), and the non-return groove (6) is connected to the connecting groove (4).

4. The high-sealability anti-leakage casing head for oil field wellhead according to claim 1, characterized in that: A connecting plate (7) is provided on one side of the deep-entering member (302) and the moving rod (303), and the top connecting plate (7) is connected to the deep-entering member (302), and the bottom connecting plate (7) is in contact with the spring (304).

5. The high-sealability anti-leakage casing head for oil field wellhead according to claim 1, characterized in that: The casing head body (1) and the connecting pipe (2) are both provided with a fixing groove (8), and the spring (304) is located inside the fixing groove (8).

6. The high-sealability anti-leakage casing head for oil field wellhead according to claim 1, characterized in that: Two connecting rings (9) are provided at the top and bottom of the sealing ring (301), and sealing grooves (10) for use with the connecting rings (9) are provided inside the casing head body (1) and the connecting pipe (2), and the surface of the connecting ring (9) is tightly fitted with the inner wall of the sealing groove (10).

7. The high-sealability anti-leakage casing head for oil field wellhead according to claim 6, characterized in that: The sealing ring (301), the penetration piece (302), the connecting ring (9) and the protrusion (5) are all made of polyurethane rubber material.

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