Leak-proof device of oil extraction wellhead

Abstract

The utility model relates to the field of leakproof devices, in particular to a leakproof device of an oil extraction wellhead, which comprises a wellhead oil outlet pipe, an oil receiving pipe, a first connecting flange plate and a second connecting flange plate. A first connecting flange plate is fixedly installed at the end, away from the oil extraction wellhead, of the wellhead oil outlet pipe, a second connecting flange plate is fixedly installed at the end, close to the wellhead oil outlet pipe, of the oil receiving pipe, and a gasket structure used for preventing oil leakage is arranged between the first connecting flange plate and the second connecting flange plate. An anti-leakage ring groove is formed in the face, close to the second connecting flange plate, of the first connecting flange plate, an anti-leakage top ring corresponding to the anti-leakage ring groove is arranged on the face, close to the first connecting flange plate, of the second connecting flange plate, and a wrapping ring wrapping the first connecting flange plate is installed on the edge of the second connecting flange plate. The anti-leakage ring groove and the anti-leakage top ring are combined, and after the first connecting flange plate and the second connecting flange plate are connected, the anti-leakage ring groove and the anti-leakage top ring can be clamped together to form a first anti-leakage barrier.

Description

Leakage prevention device at oil wellhead Technical Field

[0001] This utility model relates to the field of leak prevention devices, and in particular to leak prevention devices for oil wellheads. Background Technology

[0002] An oil well is a wellbore specifically designed for extracting underground oil resources. It is a crucial facility in the petroleum industry. Through drilling technology, it penetrates underground oil layers to extract the oil. The wellhead is the entrance and exit point for oil well production, allowing crude oil to flow from the underground oil layer to the surface through pipelines.

[0003] Currently, the inlet and outlet pipes of oil wells on the market are usually connected by ordinary flanges. After the inlet pipe and the outlet pipe are connected by ordinary flanges, the lack of corresponding anti-leakage structure between the ordinary flanges makes it easy for oil to leak from between the flanges under high pressure after the valve is opened.

[0004] Therefore, to address the problem that oil can easily leak between flanges under high pressure after the valve is opened, an anti-leakage device for the oil wellhead can be designed. By modifying the structure of the flange, the flange can be equipped with a corresponding anti-leakage structure, thereby facilitating the solution of the above problem. Summary of the Invention

[0005] To overcome the problem that the oil inlet and outlet pipes of oil wells on the market are usually connected by ordinary flanges, the oil inlet pipe and the oil outlet pipe are connected by ordinary flanges. However, because ordinary flanges lack corresponding anti-leakage structures, oil is prone to leaking from between the flanges under high pressure after the valve is opened.

[0006] The technical solution of this utility model is as follows: a leak prevention device for an oil wellhead, comprising an oil outlet pipe and an oil inlet pipe, a first connecting flange, and a second connecting flange; the first connecting flange is fixedly installed at the end of the oil outlet pipe away from the oil wellhead, and the second connecting flange is fixedly installed at the end of the oil inlet pipe near the oil outlet pipe; a gasket structure for preventing oil leakage is provided between the first connecting flange and the second connecting flange; a leak prevention ring groove is provided on the side of the first connecting flange near the second connecting flange; a leak prevention top ring corresponding to the leak prevention ring groove is provided on the side of the second connecting flange near the first connecting flange; and a wrapping ring is installed at the edge of the second connecting flange to enclose the first connecting flange.

[0007] Preferably, this application combines a first connecting flange, a second connecting flange, a leak-proof ring groove, a leak-proof top ring, and a protective ring, so that after the first connecting flange and the second connecting flange are connected, the leak-proof ring groove and the leak-proof top ring can be engaged together to form a first leak-proof barrier, and the protective ring of the second connecting flange wraps around the edge of the first connecting flange to form a second leak-proof barrier.

[0008] Preferably, the inner and outer rings of the anti-leakage top ring away from the second connecting flange are both chamfered, and an oil outlet hole is provided in the center of the first connecting flange, which passes through the center of the first connecting flange and the second connecting flange.

[0009] Preferably, the gasket structure includes a rubber anti-leakage gasket, a rubber outer chamfered gasket, a rubber inner chamfered gasket, and a rubber connecting gasket, with the rubber anti-leakage gasket fitting inside the anti-leakage ring groove.

[0010] Preferably, the inner chamfered rubber washer is located on the inner ring of the rubber anti-leakage washer on the side away from the anti-leakage ring groove, and the outer chamfered rubber washer is located on the outer ring of the rubber anti-leakage washer on the side away from the anti-leakage ring groove.

[0011] Preferably, a plurality of primary connection holes are provided around the edge of the surface of the first connecting flange, and a plurality of fixing nuts corresponding to the primary connection holes are provided around the side of the first connecting flange away from the second connecting flange.

[0012] Preferably, multiple sets of secondary connection holes are provided around the edge of the surface of the second connecting flange.

[0013] Preferably, the rubber connecting gasket is located between the first connecting flange and the second connecting flange, and the surface of the rubber connecting gasket is provided with through holes corresponding to the primary connecting hole and the secondary connecting hole.

[0014] The beneficial effects of this utility model are as follows: Compared with the current market situation where the oil inlet pipe and wellhead outlet pipe lack corresponding anti-leakage structures after being connected by ordinary flanges, which easily leads to oil leakage between the flanges, this application combines a first connecting flange, a second connecting flange, an anti-leakage ring groove, an anti-leakage top ring, and a retaining ring. This allows the anti-leakage ring groove and the anti-leakage top ring to engage together after the first connecting flange and the second connecting flange are connected, forming a first anti-leakage barrier. The retaining ring of the second connecting flange wraps around the edge of the first connecting flange, forming a second anti-leakage barrier. At the same time, the combination of rubber anti-leakage gaskets, rubber outer chamfered gaskets, and rubber inner chamfered gaskets further fills the connection gap between the anti-leakage top ring and the anti-leakage ring groove. The rubber connecting gaskets prevent rigid contact between the first connecting flange and the second connecting flange, while improving the sealing performance of the oil outlet, further preventing oil leakage when flowing through the oil outlet. Attached Figure Description

[0015] Figure 1 shows a schematic diagram of the overall structure of the leak prevention device of this utility model;

[0016] Figure 2 shows a schematic diagram of the first connecting flange of the leak prevention device of this utility model;

[0017] Figure 3 shows a schematic diagram of the second connecting flange of the leak prevention device of this utility model;

[0018] Figure 4 shows a schematic diagram of the gasket structure of the anti-leakage device of this utility model.

[0019] Explanation of reference numerals in the attached drawings: 1. Wellhead oil outlet pipe; 2. Oil inlet pipe; 3. First connecting flange; 4. Second connecting flange; 5. Gasket structure; 6. Anti-leakage ring groove; 7. Primary connection hole; 8. Oil outlet hole; 9. Fixing nut; 10. Anti-leakage top ring; 11. Butt chamfer; 12. Secondary connection hole; 13. Enclosure ring; 14. Rubber anti-leakage gasket; 15. Rubber outer chamfer gasket; 16. Rubber inner chamfer gasket; 17. Rubber connecting gasket; 18. Through hole. Detailed Implementation

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0021] Please refer to Figures 1-4. This utility model provides an embodiment of an anti-leakage device for an oil wellhead, including an oil outlet pipe 1 and an oil inlet pipe 2, a first connecting flange 3, and a second connecting flange 4. The first connecting flange 3 is fixedly installed at the end of the oil outlet pipe 1 away from the oil wellhead, and the second connecting flange 4 is fixedly installed at the end of the oil inlet pipe 2 near the oil outlet pipe 1. A gasket structure 5 for preventing oil leakage is provided between the first connecting flange 3 and the second connecting flange 4. An anti-leakage ring groove 6 is provided on the side of the first connecting flange 3 near the second connecting flange 4, and an anti-leakage top ring 10 corresponding to the anti-leakage ring groove 6 is provided on the side of the second connecting flange 4 near the first connecting flange 3. A wrapping ring 13 is installed at the edge of the second connecting flange 4 to wrap around the first connecting flange 3.

[0022] Please refer to Figures 1-3. In this embodiment, the inner and outer rings of the anti-leakage top ring 10 away from the second connecting flange 4 are both provided with butt chamfers 11. The center of the first connecting flange 3 is provided with an oil outlet hole 8, which passes through the center of the first connecting flange 3 and the second connecting flange 4. The gasket structure 5 includes a rubber anti-leakage gasket 14, a rubber outer chamfered gasket 15, a rubber inner chamfered gasket 16, and a rubber connecting gasket 17. The rubber anti-leakage gasket 14 is fitted inside the anti-leakage ring groove 6. The rubber inner chamfered gasket 16 is located on the inner ring of the side of the rubber anti-leakage gasket 14 away from the anti-leakage ring groove 6. The chamfered washer 15 is located on the outer ring of the rubber anti-leakage washer 14 away from the anti-leakage ring groove 6. It is combined with the anti-leakage top ring 10 through the butt chamfer 11, so that when the second connecting flange 4 is connected to the first connecting flange 3, the anti-leakage top ring 10 can be easily pushed into the anti-leakage ring groove 6 through the guide space provided by the butt chamfer 11, thereby avoiding misalignment when the second connecting flange 4 is connected to the first connecting flange 3. The rubber anti-leakage washer 14, the rubber outer chamfered washer 15 and the rubber inner chamfered washer 16 are combined together to further fill the connection gap between the anti-leakage top ring 10 and the anti-leakage ring groove 6.

[0023] Please refer to Figures 2-4. In this embodiment, multiple sets of primary connection holes 7 are formed around the edge of the surface of the first connecting flange 3. Multiple sets of fixing nuts 9 corresponding to the primary connection holes 7 are formed around the side of the first connecting flange 3 away from the second connecting flange 4. Multiple sets of secondary connection holes 12 are formed around the edge of the surface of the second connecting flange 4. A rubber connecting gasket 17 is located between the first connecting flange 3 and the second connecting flange 4. The surface of the rubber connecting gasket 17 has through holes 18 corresponding to the primary connection holes 7 and the secondary connection holes 12. By combining the primary connection holes 7 and the secondary connection holes 12, when installing the first connecting flange 3 and the second connecting flange 4, the operator can pass the bolts through the secondary connection holes 12 through the primary connection holes 7 and screw them into the fixing nuts 9 to complete the installation. The rubber connecting gasket 17 avoids rigid contact between the first connecting flange 3 and the second connecting flange 4, and at the same time improves the sealing performance of the oil outlet 8, further preventing oil leakage when flowing in the oil outlet 8.

[0024] During operation, the workers first push the anti-leakage top ring 10 into the anti-leakage ring groove 6 through the guide space provided by the butt chamfer 11, thereby preventing misalignment when the second connecting flange 4 is connected to the first connecting flange 3. Then, the rubber anti-leakage gasket 14, the rubber outer chamfer gasket 15, and the rubber inner chamfer gasket 16 are combined together to further fill the connection gap between the anti-leakage top ring 10 and the anti-leakage ring groove 6.

[0025] Then, the bolts are screwed into the fixing nut 9 through the secondary connection hole 12 and the primary connection hole 7 to complete the installation. The rubber connecting washer 17 avoids rigid contact between the first connecting flange 3 and the second connecting flange 4, while improving the sealing of the oil outlet hole 8 and further preventing oil leakage when flowing in the oil outlet hole 8.

[0026] Through the above steps, this application combines the first connecting flange 3, the second connecting flange 4, the anti-leakage ring groove 6, the anti-leakage top ring 10, and the wrapping ring 13, so that after the first connecting flange 3 and the second connecting flange 4 are connected, the anti-leakage ring groove 6 and the anti-leakage top ring 10 can be engaged together to form the first anti-leakage barrier. The wrapping ring 13 of the second connecting flange 4 wraps around the edge of the first connecting flange 3 to form the second anti-leakage barrier. At the same time, the rubber anti-leakage gasket 14, the rubber outer chamfer gasket 15, and the rubber inner chamfer gasket 16 of the gasket structure 5 are combined together to further fill the connection gap between the anti-leakage top ring 10 and the anti-leakage ring groove 6. The rubber connecting gasket 17 avoids rigid contact between the first connecting flange 3 and the second connecting flange 4, and at the same time improves the sealing performance of the oil outlet 8, further preventing oil leakage when flowing in the oil outlet 8.

Claims

1. A leak prevention device for an oil wellhead, comprising an oil outlet pipe (1) and an oil inlet pipe (2); characterized in that: It also includes a first connecting flange (3) and a second connecting flange (4); the end of the wellhead oil outlet pipe (1) away from the wellhead is fixedly installed with the first connecting flange (3), the end of the oil inlet pipe (2) near the wellhead oil outlet pipe (1) is fixedly installed with the second connecting flange (4), a gasket structure (5) for preventing oil leakage is provided between the first connecting flange (3) and the second connecting flange (4), a leak-proof ring groove (6) is provided on the side of the first connecting flange (3) near the second connecting flange (4), a leak-proof top ring (10) corresponding to the leak-proof ring groove (6) is provided on the side of the second connecting flange (4) near the first connecting flange (3), and a wrapping ring (13) is installed on the edge of the second connecting flange (4) to wrap the first connecting flange (3).

2. The leak prevention device for oil wellheads according to claim 1, characterized in that: The anti-leakage top ring (10) has chamfers (11) on both the inner and outer rings of the end face away from the second connecting flange (4). The center of the first connecting flange (3) has an oil outlet hole (8), which passes through the center of the first connecting flange (3) and the second connecting flange (4).

3. The leak prevention device for oil wellheads according to claim 1, characterized in that: The gasket structure (5) includes a rubber anti-leakage gasket (14), a rubber outer chamfered gasket (15), a rubber inner chamfered gasket (16) and a rubber connecting gasket (17), with the rubber anti-leakage gasket (14) fitting inside the anti-leakage ring groove (6).

4. The leak prevention device for oil wellheads according to claim 3, characterized in that: The inner chamfered rubber washer (16) is located on the inner ring of the rubber anti-leakage washer (14) away from the anti-leakage ring groove (6), and the outer chamfered rubber washer (15) is located on the outer ring of the rubber anti-leakage washer (14) away from the anti-leakage ring groove (6).

5. The leak prevention device for oil wellheads according to claim 1, characterized in that: Multiple sets of primary connection holes (7) are provided around the edge of the surface of the first connecting flange (3), and multiple sets of fixing nuts (9) corresponding to the primary connection holes (7) are provided around the side of the first connecting flange (3) away from the second connecting flange (4).

6. The leak prevention device for oil wellheads according to claim 1, characterized in that: Multiple sets of secondary connection holes (12) are provided around the edge of the surface of the second connecting flange (4).

7. The leak prevention device for oil wellheads according to claim 3, characterized in that: The rubber connecting gasket (17) is located between the first connecting flange (3) and the second connecting flange (4). The surface of the rubber connecting gasket (17) is provided with through holes (18) corresponding to the primary connecting hole (7) and the secondary connecting hole (12).

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