A casing head

Abstract

The utility model relates to the field of oil drilling, concretely relates to a casing head, the upper portion of casing head is equipped with first flange plate, the upside of casing head is installed with connector, the lower portion of connector is equipped with the second flange plate corresponding with first flange plate, still include screw rod, screw rod is inserted and is installed on first flange plate and second flange plate, and the upper and lower ends of screw rod respectively project first flange plate and second flange plate, and the one end of screw rod projecting first flange plate or second flange plate is screwed with nut, be equipped with limit hole on second flange plate, be equipped with limit block on screw rod, limit block is clamped in limit hole, and limit hole is opposite to limit block circumferential limit, the bottom of limit hole is equipped with the support platform for bearing limit block, and limit hole penetrates second flange plate upwards. When installing the nut, avoid the nut to carry screw rod idling, improve equipment installation efficiency, and can carry out circumferential limit to screw rod, prevent the nut from loosening, improved the reliability and security of connection.

Description

Technical Field

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

[0002] In drilling and completion operations in the oil and gas energy industries, wellhead equipment is crucial for ensuring operational safety, preventing blowouts, and controlling downhole pressure. The casing head, as an important component of the wellhead equipment, is typically installed at the top of the surface casing string. It suspends subsequent casing layers, seals the annulus between casing layers, and provides a connection base for installing other well control equipment such as blowout preventer assemblies and Christmas trees.

[0003] Traditional casing heads and upper connectors, such as blowout preventers (BOPs) or four-way connectors, often use flange connections, secured by circumferentially distributed screws and nuts. However, this conventional connection structure has some inherent drawbacks in practical applications: when installing the nuts, the lack of effective circumferential restraint on the screws can easily cause them to spin freely, making it difficult to tighten the nuts to the intended torque. This not only significantly reduces installation efficiency but may also lead to insufficient preload, affecting the sealing reliability of the flange connection. During drilling or production, wellhead equipment is subjected to long-term pressure fluctuations from the formation medium, equipment vibration, and impact loads from operations. These dynamic loads can easily cause the nuts in traditional flange connections to loosen, or even cause the screws to rotate, resulting in a gradual decrease in preload. Insufficient clamping force on the flange sealing surface can lead to leakage of high-pressure well media, causing serious environmental pollution, energy waste, and even safety accidents. Utility Model Content

[0004] The purpose of this invention is to provide a sleeve head to address the above problems, thereby solving the problem that in the prior art, the screw lacks circumferential constraint, and the torque for tightening the nut easily causes the screw to spin freely, making it difficult to tighten the nut to the predetermined torque.

[0005] To achieve the above objectives, this utility model discloses a sleeve head. The upper part of the sleeve head is provided with a first flange. Its structural features are: a connector is installed on the upper side of the sleeve head, and a second flange corresponding to the first flange is provided at the lower part of the connector. It also includes a screw rod, which is inserted into the first flange and the second flange. The upper and lower ends of the screw rod protrude from the first flange and the second flange, respectively. A nut is screwed onto one end of the screw rod that protrudes from the first flange or the second flange. A limiting hole is provided on the second flange, and a limiting block is provided on the screw rod. The limiting block is engaged in the limiting hole, and the limiting hole limits the circumferential movement of the limiting block.

[0006] The nuts at both ends of the screw can apply uniform preload to ensure effective compression of the flange sealing surface and prevent leakage of the medium inside the well. The limiting block and the limiting hole cooperate with each other to prevent the nut from carrying the screw to rotate freely when installing the nut, making it easier to tighten the nut and improving the equipment installation efficiency. After the nut is tightened, the limiting block is locked in the limiting hole, realizing the circumferential limitation of the screw. Under the condition of equipment vibration or pressure fluctuation, the screw itself cannot rotate, thereby preventing the nut from loosening due to the rotation of the screw and improving the reliability and safety of the connection.

[0007] The first flange has a first through hole, and the second flange has a second through hole. The first and second through holes are vertically aligned, and the bolt is inserted into the first and second through holes. This ensures that the bolt can pass through vertically and smoothly, allowing the two flanges to be precisely aligned, facilitating assembly, and ensuring even force distribution.

[0008] The limiting hole is located on the upper part of the first flange and extends downwards, with its lower part connecting to the upper part of the second through hole. The limiting block is inserted into the limiting hole from the upper part of the first flange and is locked in the limiting hole, resulting in a compact structure that does not occupy additional space.

[0009] The bottom of the limiting hole is equipped with a support platform for supporting the limiting block, and the limiting hole extends upward through the second flange. When installing the screw, the limiting block is placed into the limiting hole, and the support platform supports the limiting block, which can prevent the screw from slipping out of the through hole and facilitate the installation of the nut. When installing the second nut, the screw is pushed upward to avoid the limiting block contacting the support platform.

[0010] The limiting block is hexagonal in shape, and the limiting hole is also hexagonal in shape to match the size of the limiting block. The hexagon is a regular hexagon, which can effectively eliminate circumferential movement gaps and provide uniform limiting support.

[0011] The first and second flanges are spaced apart to provide sufficient preload after the nuts are tightened.

[0012] The upper part of the sleeve head has a first boss, and the lower part of the connector has a second boss. The first boss and the second boss fit together. A rubber ring can be placed between the first boss and the second boss to enhance the sealing effect.

[0013] The connector has a third flange on its upper part for connecting to wellhead equipment. The third flange is used to connect to the wellhead equipment.

[0014] The connector has a tube hole for the sleeve to pass through, and the tube hole is connected to the sleeve head. The tube hole is used to install the sleeve.

[0015] Multiple screws are provided, and the screws are distributed circumferentially to disperse the force, making the sleeve head and connector more secure and reliable.

[0016] In summary, the beneficial effects of this utility model are as follows: the nuts at both ends of the screw can be subjected to uniform preload, ensuring effective compression of the flange sealing surface and preventing leakage of the medium inside the well; the limiting block and the limiting hole cooperate with each other, preventing the nut from carrying the screw to rotate freely when installing the nut, facilitating the tightening of the nut and improving the equipment installation efficiency; after the nut is tightened, the limiting block is engaged in the limiting hole, realizing circumferential limiting of the screw, and the screw itself cannot rotate under equipment vibration or pressure fluctuation, thereby preventing the nut from loosening due to the rotation of the screw, improving the reliability and safety of the connection. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 for Figure 1 A magnified view of the local structure at point A; Figure 3 This is a schematic diagram of the connector structure; Figure 4 This is a schematic diagram of the sleeve head structure; Figure 5 This is a schematic diagram of the screw.

[0018] In the diagram: 1. Sleeve head; 2. Connector; 3. Pipe hole; 4. Screw; 5. First flange; 6. Second flange; 7. Limiting block; 8. Limiting hole; 9. First through hole; 10. Second through hole; 11. Nut; 12. Support platform; 13. First boss; 14. Second boss; 15. Third flange. Detailed Implementation

[0019] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit the scope of this utility model.

[0020] The following is a description of preferred embodiments of the present invention in conjunction with the accompanying drawings.

[0021] A type of sleeve head, comprising a first flange 5 on the upper part of the sleeve head 1, characterized by: a connector 2 mounted on the upper side of the sleeve head 1; a second flange 6 corresponding to the first flange 5 on the lower part of the connector 2; and a screw 4 inserted into the first flange 5 and the second flange 6, with its upper and lower ends protruding from the first flange 5 and the second flange 6 respectively. A nut 11 is screwed onto one end of the screw 4 protruding from the first flange 5 or the second flange 6. A limiting hole 8 is provided on the second flange 6, and a limiting block 7 is provided on the screw 4. The limiting block 7 is engaged in the limiting hole 8, and the limiting hole 8 circumferentially limits the limiting block 7. (See attached diagram.) Figure 1The nuts 11 at both ends of the screw 4 can apply uniform preload to ensure effective compression of the flange sealing surface and prevent leakage of the medium inside the well. The limiting block 7 and the limiting hole 8 cooperate with each other to prevent the screw 4 from spinning freely when the nut 11 is installed, making it easier to tighten the nut 11 and improving the equipment installation efficiency. After the nut 11 is tightened, the limiting block 7 is inserted into the limiting hole 8, realizing the circumferential limiting of the screw 4. Under the condition of equipment vibration or pressure fluctuation, the screw 4 itself cannot rotate, thereby preventing the nut 11 from loosening due to the rotation of the screw 4, improving the reliability and safety of the connection.

[0022] See attached document Figure 1 The first flange 5 has a first through hole 9, and the second flange 6 has a second through hole 10. The first through hole 9 and the second through hole 10 are vertically aligned, and the screw 4 is inserted into the first through hole 9 and the second through hole 10. This ensures that the screw 4 can pass through vertically and smoothly, allowing for precise alignment of the two flanges, facilitating assembly, and ensuring even force distribution. (Refer to the attached document.) Figure 3 The limiting hole 8 is located on the upper part of the first flange 5, extending downwards, and its lower part connects to the upper part of the second through hole 10. The limiting block 7 is inserted from the upper part of the first flange 5 into the limiting hole 8 and is secured within it, resulting in a compact structure that does not occupy additional space. A support platform 12 for supporting the limiting block 7 is provided at the bottom of the limiting hole 8, and the limiting hole 8 extends upwards through the second flange 6. When installing the screw 4, the limiting block 7 is placed into the limiting hole 8, and the support platform 12 supports the limiting block 7, preventing the screw 4 from slipping out of the through hole and facilitating the installation of the nut 11. When installing the second nut 11, the screw 4 is pushed upwards to prevent the limiting block 7 from contacting the support platform 12. (See attached diagram.) Figure 5 The limiting block 7 is hexagonal in shape, and the limiting hole 8 is also hexagonal in shape, matching the size of the limiting block 7. The hexagon is a regular hexagon, which effectively eliminates circumferential movement gaps and provides uniform limiting support.

[0023] See attached document Figure 1 The first flange 5 and the second flange 6 are spaced apart to provide sufficient preload after the nut 11 is tightened. The upper part of the casing head 1 has a first boss 13, and the lower part of the connector 2 has a second boss 14, which fit together. A rubber ring can be placed between the first boss 13 and the second boss 14 to enhance the sealing effect. The upper part of the connector 2 has a third flange 15 for connecting to wellhead equipment. The connector 2 has a pipe hole 3 for the casing to pass through, which communicates with the casing head 1 and is used to install the casing. Multiple screws 4 are provided, distributed circumferentially to distribute the force, making the casing head 1 and connector 2 more secure and reliable.

[0024] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present utility model, and these improvements and substitutions should also be considered within the protection scope of the present utility model.

Claims

1. A sleeve head, wherein the upper part of the sleeve head (1) is provided with a first flange (5), characterized in that, The upper side of the sleeve head (1) is equipped with a connector (2), and the lower part of the connector (2) is provided with a second flange (6) corresponding to the first flange (5). It also includes a screw (4), which is inserted into the first flange (5) and the second flange (6). The upper and lower ends of the screw (4) protrude from the first flange (5) and the second flange (6) respectively. A nut (11) is screwed onto one end of the screw (4) that protrudes from the first flange (5) or the second flange (6). The second flange (6) is provided with a limiting hole (8), and the screw (4) is provided with a limiting block (7). The limiting block (7) is locked in the limiting hole (8), and the limiting hole (8) limits the limiting block (7) circumferentially.

2. The sleeve head as described in claim 1, characterized in that, The first flange (5) is provided with a first through hole (9), and the second flange (6) is provided with a second through hole (10). The first through hole (9) and the second through hole (10) are corresponding to each other, and the screw (4) is inserted into the first through hole (9) and the second through hole (10).

3. The sleeve head as described in claim 2, characterized in that, The limiting hole (8) is located on the upper part of the second flange (6), and the limiting hole (8) extends downward. The lower part of the limiting hole (8) is connected to the upper part of the second through hole (10).

4. The sleeve head as described in claim 3, characterized in that, The bottom of the limiting hole (8) is provided with a support platform (12) for supporting the limiting block (7), and the limiting hole (8) extends upward through the second flange (6).

5. The sleeve head as described in claim 1, characterized in that, The limiting block (7) is hexagonal in shape, and the limiting hole (8) is hexagonal in shape matching the size of the limiting block (7).

6. The sleeve head as described in claim 1, characterized in that, The first flange (5) and the second flange (6) are spaced apart vertically.

7. The sleeve head as described in claim 6, characterized in that, The upper part of the sleeve head (1) is provided with a first boss (13), and the lower part of the connector (2) is provided with a second boss (14). The first boss (13) and the second boss (14) fit together.

8. The sleeve head as described in claim 1, characterized in that, The upper part of the connector (2) is provided with a third flange (15) for connecting wellhead equipment.

9. The sleeve head as described in claim 1, characterized in that, The connector (2) is provided with a tube hole (3) for the sleeve to pass through, and the tube hole (3) is connected to the sleeve head (1).

10. The sleeve head as described in claim 1, characterized in that, The screw (4) is provided in multiple ways, and the multiple screws (4) are distributed in a circumferentially spaced manner.

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