A casing head for an oil production wellhead

Abstract

The utility model relates to petroleum equipment technical field, concretely is a casing head of oil production well mouth of oil, including casing head, the upper flange is provided on casing head upper end, the hanger is provided on the upper flanger upper end, casing head bottom is provided with casing, the lower flange is fixedly installed to casing bottom, the first casing and second casing are provided on the lower flange outside, the first casing top is fixedly installed with the roof, and the first casing bottom is provided with the connecting plate, the connecting plate bottom is fixedly installed with the connecting ring, and the connecting ring bottom is fixedly installed with the rubber pad, beneficial effect is: the first casing and second casing are combined, first rubber ring inner ring surface forms a ring and is attached to the outer surface of casing, the limiting groove covers the bolt and protects it, the connecting plate is movable, the rubber pad is attached to the bottom mounting seat or ground, and water flow is directly prevented from flowing into the inside and contacting the lower flange and mounting seat.

Description

Technical Field

[0001] This utility model relates to the field of petroleum equipment, specifically a casing head for oil wellheads. Background Technology

[0002] The casing head at the oil wellhead is the core component connecting the downhole casing to the surface wellhead equipment. Located at the bottom of the wellhead, it serves as a "bridge" between the oil and gas wellbore and the surface equipment. Its main functions are to fix the casing string, seal the casing annulus, bear the weight of the wellhead equipment, and provide a connection foundation for the subsequent installation of equipment such as Christmas trees and blowout preventers. When in use, the casing head needs to be fixed to the ground or base with bolts.

[0003] In the prior art, the bolts used when installing the casing head of an oil wellhead are exposed and are prone to rust after long-term use. If the rusted bolts loosen, the pressure on the sealing surface will be insufficient, and high-pressure oil and gas or formation fluids may leak from the gap, causing annular crossflow, wellhead contamination, or even well control risks. Therefore, this utility model proposes a casing head for an oil wellhead to solve the above problems. Utility Model Content

[0004] The purpose of this utility model is to provide a casing head for oil wellheads to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a casing head for an oil wellhead, comprising a casing head, an upper flange provided at the upper end of the casing head, a hanger provided at the upper end of the upper flange, a casing provided at the bottom end of the casing head, a lower flange fixedly installed at the bottom end of the casing, and a first shell and a second shell provided on the outer side of the lower flange.

[0006] A top plate is fixedly installed at the top of the first housing, and a connecting plate is provided at the bottom of the first housing. A connecting ring is fixedly installed at the bottom of the connecting plate, and a rubber pad is fixedly installed at the bottom of the connecting ring.

[0007] The inner wall of the first housing is provided with a rubber layer.

[0008] Preferably, the first and second housings have the same shape and surface structure. The upper flange has several sets of set screws on its side and several sets of threaded holes on its surface. Bolts are threaded into the threaded holes. A limit groove is formed on the bottom wall of the top plate corresponding to the bolt position. A second rubber ring is fixedly installed on the inner side wall of the limit groove.

[0009] Preferably, the top plate is ring-shaped, and a first rubber ring is fixedly installed on the inner ring surface of the top plate, with the inner ring surface of the first rubber ring fitting against the outer surface of the sleeve.

[0010] Preferably, the first housing has an internal receiving groove, and the bottom of the receiving groove has a moving groove. The bottom of the moving groove passes through the bottom wall of the first housing. A limiting slider is slidably installed in the receiving groove. The bottom wall of the limiting slider is fixedly connected to the top of the connecting plate. The bottom of the connecting plate is slidably installed in the moving groove.

[0011] Preferably, a T-shaped groove is formed on the rear sidewall of the outer surface of the first housing, and a T-shaped block is fixedly installed on the front sidewall of the outer surface of the first housing, wherein the T-shaped block is adapted to the T-shaped groove.

[0012] Preferably, a conduit is fixedly installed on the outer wall of the sleeve head, and two sets of conduits are provided, which are symmetrically arranged. A parallel valve connected to the interior of each set of conduits is provided on the surface of each set of conduits.

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows: the first shell and the second shell are combined to form a ring. At this time, the inner ring surface of the first rubber ring forms a ring that fits against the outer surface of the sleeve to prevent water from flowing directly in. The limiting groove covers the bolts to protect them. The connecting plate is movable and can be moved up and down as needed. The rubber pad at the bottom of the connecting plate fits against the bottom mounting base or the ground to a certain extent, preventing water from flowing directly into the interior and contacting the lower flange and mounting base. Attached Figure Description

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

[0015] Figure 2 This is a schematic diagram of the lower flange of the present invention.

[0016] Figure 3 This is a schematic diagram of the first and second housings of the present invention;

[0017] Figure 4 This is a schematic diagram of the T-shaped block structure of this utility model;

[0018] Figure 5 This is a schematic diagram of the rubber pad structure of this utility model.

[0019] In the diagram: 1. Sleeve head; 2. First housing; 3. Second housing; 4. Hanger; 5. Upper flange; 6. Set screw; 7. Parallel valve; 8. Sleeve; 9. Bolt; 10. Lower flange; 11. Threaded hole; 12. Guide tube; 13. Receiving groove; 14. Top plate; 15. Connecting plate; 16. First rubber ring; 17. Rubber layer; 18. T-block; 19. T-slot; 20. Limiting groove; 21. Second rubber ring; 22. Limiting slider; 23. Moving groove; 24. Connecting ring; 25. Rubber pad. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this utility model clear and complete, the embodiments of this utility model will be further described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only some, not all, embodiments of this utility model, and are merely used to explain the embodiments of this utility model. They are not intended to limit the embodiments of this utility model. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0021] Example 1: Please refer to Figures 1-5 This utility model provides a technical solution: a casing head for an oil wellhead, comprising a casing head 1, characterized in that: an upper flange 5 is provided at the upper end of the casing head 1, a hanger 4 is provided at the upper end of the upper flange 5, a casing 8 is provided at the bottom end of the casing head 1, a lower flange 10 is fixedly installed at the bottom end of the casing 8, a first housing 2 and a second housing 3 are provided on the outer side of the lower flange 10; a top plate 14 is fixedly installed at the top of the first housing 2, which can shield the lower flange 10 to prevent rainwater from directly entering; a connecting plate 15 is provided at the bottom end of the first housing 2, a connecting ring 24 is fixedly installed at the bottom end of the connecting plate 15, and a rubber pad 25 is fixedly installed at the bottom end of the connecting ring 24; a rubber layer 17 is provided on the inner wall of the first housing 2.

[0022] When in use, the rubber pad 25 fixedly installed at the bottom of the connecting ring 24 can be attached to the ground or the mounting base. In the presence of water flow, it can prevent water from directly entering the interior and contacting it to a certain extent. The rubber layer 17 set on the inner wall of the first housing 2 is attached to the outer surface of the lower flange 10, providing a certain degree of protection to the outer surface.

[0023] Example 2: Based on Example 1, the first housing 2 and the second housing 3 have the same shape and surface structure. The upper flange 5 has several sets of set screws 6 on its side, which can be used to fix the hanger 4. The lower flange 10 has several sets of threaded holes 11 on its surface, and bolts 9 are connected to the internal threads of the threaded holes 11. The bottom wall of the top plate 14 has a limit groove 20 corresponding to the position of the bolts 9. A second rubber ring 21 is fixedly installed on the inner side wall of the limit groove 20. The top plate 14 is ring-shaped, and a first rubber ring 16 is fixedly installed on the inner ring surface of the top plate 14. The inner ring surface of the first rubber ring 16 is in contact with the outer surface of the sleeve 8.

[0024] When using the sleeve head 1, the sleeve head 1 is installed by bolt 9. The bolt 9 is threaded into the threaded hole 11 and fixed to the base or ground. The limiting groove 20 opened on the bottom wall of the top plate 14 is aligned with the bolt 9 and engaged. At this time, the second rubber ring 21 wraps around the outer surface of the top of the bolt 9 to protect the top of the bolt 9.

[0025] Example 3: Based on Example 2, the first housing 2 has an internal receiving groove 13, and a moving groove 23 is provided at the bottom of the receiving groove 13. The bottom of the moving groove 23 passes through the bottom wall of the first housing 2. A limiting slider 22 is slidably installed in the receiving groove 13. The bottom wall of the limiting slider 22 is fixedly connected to the top of the connecting plate 15. The connecting plate 15 can be moved by pulling down, moving within the receiving groove 13 and through the moving groove 23, thus bringing the rubber pad 25 into contact with the ground. The bottom of the connecting plate 15 is slidably installed in the moving groove 23. A T-shaped groove 19 is provided on the rear side wall of the outer surface of the first housing 2. A T-shaped block 18 is fixedly installed on the front side wall of the outer surface of the first housing 2. The T-shaped block 18 is adapted to the T-shaped groove 19. A conduit 12 is fixedly installed on the outer wall of the sleeve head 1. Two sets of conduits 12 are provided, symmetrically arranged. Parallel valves 7 connected to the interior of each set of conduits 12 are provided on their surfaces.

[0026] The first housing 2 and the second housing 3 have the same shape and surface structure. The first housing 2 and the second housing 3 have two T-slots 19 facing each other. By installing the T-blocks 18 on the outer surface of the first housing 2 into the T-slots 19 on the outer surface of the second housing 3, and installing the T-blocks 18 on the outer surface of the second housing 3 into the T-slots 19 on the outer surface of the first housing 2, the first housing 2 and the second housing 3 are merged to form a ring shape, which protects the lower flange 10 and the bolts 9.

[0027] In actual use, the first housing 2 and the second housing 3 are combined to form a ring. At this time, the inner ring surface of the first rubber ring 16 forms a ring that fits against the outer surface of the sleeve 8 to prevent water from flowing directly in. The limiting groove 20 covers the bolt 9 to protect it. The connecting plate 15 is movable and can be moved up and down as needed. The rubber pad 25 set at the bottom of the connecting plate 15 fits against the bottom mounting base or the ground to a certain extent to prevent water from flowing directly into the interior and contacting the lower flange 10 and the mounting base.

[0028] Although 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 alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A casing head for an oil wellhead, comprising a casing head (1), characterized in that: The upper end of the sleeve head (1) is provided with an upper flange (5), the upper end of the upper flange (5) is provided with a hanger (4), the bottom end of the sleeve head (1) is provided with a sleeve (8), the bottom end of the sleeve (8) is fixedly installed with a lower flange (10), and the outer side of the lower flange (10) is provided with a first housing (2) and a second housing (3). A top plate (14) is fixedly installed at the top of the first housing (2), and a connecting plate (15) is provided at the bottom of the first housing (2). A connecting ring (24) is fixedly installed at the bottom of the connecting plate (15), and a rubber pad (25) is fixedly installed at the bottom of the connecting ring (24). The inner wall of the first housing (2) is provided with a rubber layer (17).

2. The casing head for an oil wellhead according to claim 1, characterized in that: The first housing (2) and the second housing (3) have the same shape and surface structure. The upper flange (5) has several sets of set screws (6) on its side. The lower flange (10) has several sets of threaded holes (11) on its surface. The threaded holes (11) are connected to bolts (9) by internal threads. The bottom wall of the top plate (14) has a limit groove (20) corresponding to the position of the bolts (9). The inner side wall of the limit groove (20) is fixedly installed with a second rubber ring (21).

3. The casing head for an oil wellhead according to claim 1, characterized in that: The top plate (14) is ring-shaped, and a first rubber ring (16) is fixedly installed on the inner ring surface of the top plate (14). The inner ring surface of the first rubber ring (16) is in contact with the outer surface of the sleeve (8).

4. The casing head for an oil wellhead according to claim 1, characterized in that: The first housing (2) has an internal receiving groove (13), and the bottom of the receiving groove (13) has a moving groove (23). The bottom of the moving groove (23) passes through the bottom wall of the first housing (2). A limiting slider (22) is slidably installed in the receiving groove (13). The bottom wall of the limiting slider (22) is fixedly connected to the top of the connecting plate (15). The bottom of the connecting plate (15) is slidably installed in the moving groove (23).

5. The casing head for an oil wellhead according to claim 1, characterized in that: The rear sidewall of the outer surface of the first housing (2) is provided with a T-shaped groove (19), and a T-shaped block (18) is fixedly installed on the front sidewall of the outer surface of the first housing (2). The T-shaped block (18) is adapted to the T-shaped groove (19).

6. The casing head for an oil wellhead according to claim 1, characterized in that: The outer wall of the sleeve head (1) is fixedly installed with a conduit (12). There are two sets of the conduit (12), which are symmetrically arranged. The surface of each set of the conduit (12) is provided with a parallel valve (7) connected to its interior.

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