Casing head of oil production wellhead

Abstract

The utility model belongs to the technical field of casing heads, and particularly relates to a casing head of a petroleum production wellhead, which comprises a first fixing ring. The device is characterized in that a first fixing shaft is fixedly connected to one side of the first fixing ring, a fixing plate is movably connected to the surface of the first fixing shaft, and a second fixing shaft is movably connected to the end, away from the first fixing shaft, of the fixing plate; a movable connecting structure is formed by the first fixing ring, the first fixing shaft, the fixing plate, the second fixing shaft and the second fixing ring, the angle and the position of the casing head are finely adjusted according to the actual condition of a wellhead in the installation process, it is ensured that the casing head is accurately in butt joint with the wellhead and other equipment, and the installation efficiency is improved. Compared with the prior art, the installation flexibility and adaptability are greatly improved, meanwhile, a stable supporting foundation can be provided for the whole casing head, loads generated by a casing and internal fluid pressure are effectively dispersed, the stability of the casing head under the complex working condition is enhanced, and the leakage risk caused by unstable connection is reduced.

Description

Technical Field

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

[0002] As a vital global energy resource, the efficiency and safety of oil extraction are of paramount importance. In the oil extraction process, the casing head at the wellhead plays a crucial role. The casing head is used to fix the wellhead of the drilled well and connect the wellhead casing string. It not only supports the weight of the technical casing and the oil layer casing, but also seals the annular space between each layer of casing, providing a transition connection for the installation of blowout preventers, tubing heads, and Christmas trees.

[0003] Announcement No. CN 214660049U: This utility model provides a casing head for oil wellheads, including a casing head body. A hanger is provided on the top outer wall of the casing head body. Two guide tubes are provided on the outer wall of the casing head body. A lower connector is provided on the bottom outer wall of the casing head body. Three or more fixing plates are provided on the outer wall of the lower connector. Three or more guide grooves are formed on one side of the outer wall of each of the three or more fixing plates. Three or more connecting blocks are slidably connected to the inner walls of the three or more guide grooves. A sliding guide block is provided on one side of the outer wall of each connecting block. By setting up sliding guide blocks, fixing plates, collars, fixing plates, and guide grooves, workers can move the fixing ring upwards as a whole through the sliding guide blocks and guide grooves. Then, the fixing plates are fixed to the fixing plates with screws, maintaining a certain distance between the fixing ring and the connection between the lower connector and the outer casing, preventing the fixing ring from affecting the connection operation between the lower connector and the outer casing. However, the following problems still exist:

[0004] Traditional casing head connection structures are relatively fixed, often using bolted or welded connections. This lack of flexibility during installation makes it difficult to fine-tune the angle and position of the casing head. Consequently, a significant amount of time and effort is required to adjust the relative position of the wellhead and the casing head during installation, greatly increasing installation and time costs. Furthermore, due to insufficient precision in the connection, unstable connections can easily occur between the casing head and the wellhead and other equipment, increasing the risk of leakage and affecting the safety and continuity of oil extraction. Utility Model Content

[0005] In order to overcome the shortcomings of the existing technology and solve at least one of the technical problems mentioned in the background art, this utility model proposes a casing head for oil wellheads.

[0006] The technical solution adopted by this utility model to solve its technical problem is as follows: A casing head for an oil wellhead, comprising a first fixing ring; characterized in that: a first fixing shaft is fixedly connected to one side of the first fixing ring, a fixing plate is movably connected to the surface of the first fixing shaft, a second fixing shaft is movably connected to the end of the fixing plate away from the first fixing shaft, a second fixing ring is fixedly connected to the side of the second fixing shaft away from the fixing plate, a positioning plate is fixedly connected to one side of the second fixing ring, a positioning shaft is fixedly connected to one side of the positioning plate, a positioning rod is provided inside the positioning shaft, a fixing seat is fixedly connected to the bottom of the positioning rod, a first casing is fixedly connected inside the fixing seat, a second casing is sleeved on one side of the first casing, and an isolation block is fixedly connected to one side of the second casing.

[0007] Preferably, a fixing disc is fitted onto the surface of the first sleeve, and a first telescopic ring and a second telescopic ring are respectively fitted onto the surfaces of the first sleeve and the second sleeve. A first limiting shaft and a second limiting shaft are respectively fixedly connected to both sides of the first telescopic ring and the second telescopic ring. A first limiting plate is movably connected to the surface of the first limiting shaft, and a connecting shaft is movably connected to the end of the first limiting plate away from the first limiting shaft. A second limiting plate is movably connected to the surface of the connecting shaft, and one end of the second limiting plate is movably connected to the second limiting shaft.

[0008] Preferably, a first connecting plate and a second connecting plate are fixedly connected to one side of the first limiting shaft and the second limiting shaft, respectively. A first telescopic rod is fixedly connected to the side of the first connecting plate near the second connecting plate. A second telescopic rod is sleeved on one end of the first telescopic rod, and the second telescopic rod is fixedly connected to the second connecting plate.

[0009] Preferably, a first elastic shaft is fixedly connected to the side of the first connecting disc away from the first limiting shaft, a limiting band is fixedly connected to the surface of the first elastic shaft, a second elastic band is fixedly connected to the end of the limiting band away from the first elastic band, and a fixing block is fixedly connected to the side of the second elastic band away from the elastic band.

[0010] Preferably, the first elastic band and the second elastic band are symmetrically distributed through the first limiting axis.

[0011] Preferably, the fixing block is fixedly connected to the fixing seat.

[0012] Preferably, the top of the second sleeve has a through hole, a first operating rod is fixedly connected in the through hole, a second operating rod is sleeved on one side of the first operating rod, and a valve is fixedly connected to one side of the second operating rod.

[0013] The beneficial effects of this utility model are:

[0014] 1. This utility model provides a casing head for oil wellheads, which forms a movable connection structure through a first fixing ring, a first fixing shaft, a fixing plate, a second fixing shaft, and a second fixing ring. During installation, the angle and position of the casing head can be finely adjusted according to the actual conditions of the wellhead, ensuring precise connection with the wellhead and other equipment. This greatly improves the flexibility and adaptability of installation, while providing a stable support foundation for the entire casing head. It effectively disperses the load generated by the casing and internal fluid pressure, enhances the stability of the casing head under complex working conditions, and reduces the risk of leakage due to unstable connections.

[0015] 2. This utility model provides a casing head for oil wellheads. By setting up a positioning plate, positioning shaft and positioning rod, it can accurately position the first casing during installation, ensuring that the first casing is in the correct installation position. This ensures that the first casing will not be displaced by external forces during oil extraction, thus guaranteeing the safety and continuity of extraction operations. Attached Figure Description

[0016] The accompanying drawings, which are included to provide a further understanding of the present invention and form part of this application, illustrate exemplary embodiments of the present invention and, together with the description thereof, serve to explain the present invention and do not constitute an undue limitation thereof. In the drawings:

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0018] Figure 2 This is a schematic diagram of one side of the fixing base of this utility model;

[0019] Figure 3 This is a utility model Figure 2 Enlarged structural diagram at point A in the middle;

[0020] Figure 4 This is a utility model Figure 1 Enlarged structural diagram at point B.

[0021] Legend:

[0022] 1. First fixing ring; 101. First fixing shaft; 102. Fixing plate; 103. Second fixing shaft; 104. Second fixing ring; 105. Positioning plate; 106. Positioning shaft; 107. Positioning rod; 108. Fixing seat; 109. First sleeve; 110. Second sleeve; 111. Isolation block; 2. Fixing disc; 201. First telescopic ring; 202. Second telescopic ring; 203. First limiting shaft; 204. Second limiting shaft; 205. First limiting plate; 206. Connecting shaft; 207. Second limiting plate; 3. First connecting disc; 301. Second connecting disc; 302. First telescopic rod; 303. Second telescopic rod; 4. First elastic shaft; 401. Elastic band; 402. Second elastic band; 403. Fixing block; 5. First operating lever; 501. Second operating lever; 502. Valve. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0024] Specific implementation examples are given below.

[0025] Please see Figures 1-4This utility model provides a casing head for an oil wellhead, including a first fixing ring 1; characterized in that: a first fixing shaft 101 is fixedly connected to one side of the first fixing ring 1, a fixing plate 102 is movably connected to the surface of the first fixing shaft 101, a second fixing shaft 103 is movably connected to the end of the fixing plate 102 away from the first fixing shaft 101, a second fixing ring 104 is fixedly connected to the side of the second fixing shaft 103 away from the fixing plate 102, a positioning plate 105 is fixedly connected to one side of the second fixing ring 104, a positioning shaft 106 is fixedly connected to one side of the positioning plate 105, and a positioning device is provided inside the positioning shaft 106. The positioning rod 107 has a fixed base 108 fixedly connected to its bottom. A first sleeve 109 is fixedly connected inside the fixed base 108. A second sleeve 110 is sleeved on one side of the first sleeve 109. An isolation block 111 is fixedly connected to one side of the second sleeve 110. During operation, the first fixing ring 1 is fixed to the wellhead or other related equipment, serving as the starting connection point of the entire casing head. The first fixing shaft 101 is connected to the first fixing ring 1. The fixing plate 102 can rotate relative to the first fixing ring 1 via the first fixing shaft 101. When it is necessary to adjust the angle of the casing head, the fixing plate 102 can rotate around the first fixing shaft 101. The other end of plate 2 is movably connected to the second fixed shaft 103, which is fixed to the second fixed ring 104. This connection method achieves a movable connection between the fixing plate 102 and the second fixed ring 104. The second fixed ring 104 is further connected to the positioning plate 105, which fixes the positioning shaft 106 in a specific position. The positioning rod 107 is inserted into the positioning shaft 106, thereby stably fixing the fixing seat 108 at the wellhead, completing the support and positioning of the first casing 109. During operation, the angle and position can be flexibly adjusted according to actual installation requirements to ensure the casing head is securely installed. The first casing 109 is installed on the fixing seat. Inside 108, as the main channel for fluid transportation during oil extraction, the second casing 110 is fitted onto the outside of the first casing 109, forming a relatively sealed space between them. During installation, the first casing 109 is first accurately installed on the fixing seat 108, and then the second casing 110 is carefully fitted onto the first casing 109. The isolation block 111 is installed on one side of the second casing 110, further enhancing the sealing performance between the two casings and preventing fluid leakage. During oil extraction, oil and other fluids are transported upward through the first casing 109. The second casing 110 and the isolation block 111 work together to ensure the sealing and safety of the transportation process.

[0026] Furthermore, such as Figure 1 and Figure 2As shown, a fixed disc 2 is fitted onto the surface of the first sleeve 109. A first telescopic ring 201 and a second telescopic ring 202 are fitted onto the surfaces of the first sleeve 109 and the second sleeve 110, respectively. A first limiting shaft 203 and a second limiting shaft 204 are fixedly connected to the two sides of the first telescopic ring 201 and the second telescopic ring 202, respectively. A first limiting plate 205 is movably connected to the surface of the first limiting shaft 203. A connecting shaft 206 is movably connected to the end of the first limiting plate 205 away from the first limiting shaft 203. A second limiting plate 207 is movably connected to the surface of the connecting shaft 206. One end of the second limiting plate 207 is movably connected to the second limiting shaft 204. During operation, the first telescopic ring 201 and the second telescopic ring 202 are fitted onto the surfaces of the first sleeve 109 and the second sleeve 110, respectively, and the first telescopic ring 201 and the second telescopic ring 202 will extend and retract accordingly. The first limiting shaft 203 and the second limiting shaft 204 are fixedly connected to the first limiting shaft 204, respectively. On both sides of the first telescopic ring 201 and the second telescopic ring 202, the first limiting plate 205 is movably connected to the first telescopic ring 201 via the first limiting shaft 203, and the second limiting plate 207 is movably connected to the second telescopic ring 202 via the second limiting shaft 204. The connecting shaft 206 connects the first limiting plate 205 and the second limiting plate 207. When the first telescopic ring 201 or the second telescopic ring 202 extends or retracts, it drives the first limiting shaft 203 and the second limiting shaft 204 to move, thereby causing the first limiting plate 205 and the second limiting plate 207 to rotate around the axis. The connecting shaft 206 coordinates the movement of the two to achieve adaptation and protection against sleeve deformation. At the same time, the first connecting plate 3 and the second connecting plate 301 are connected to the first limiting shaft 203 and the second limiting shaft 204 respectively. One end of the first telescopic rod 302 is fixed on the first connecting plate 3, and the other end is sleeved on the second telescopic rod 303. The second telescopic rod 303 is fixed to the second connecting plate 301. When the sleeve deforms, the first telescopic rod 302 and the second telescopic rod 303 can extend and retract further, enhancing the protective effect on the sleeve. Furthermore, the first elastic shaft 4 is fixed to the first connecting disc 3, one end of the limiting band is fixed to the first elastic shaft 4, and the other end is connected to the fixing block 403 via the second elastic band 402 / 401. The fixing block 403 is fixed to the fixing seat 108. When the sleeve is subjected to a large external force, the limiting band and the elastic band 401 can provide additional buffering and limiting effects through elastic deformation, protecting the sleeve from damage.

[0027] Furthermore, such as Figure 3 As shown, a first connecting plate 3 and a second connecting plate 301 are fixedly connected to one side of the first limiting shaft 203 and the second limiting shaft 204, respectively. A first telescopic rod 302 is fixedly connected to the side of the first connecting plate 3 near the second connecting plate 301. A second telescopic rod 303 is sleeved on one end of the first telescopic rod 302. The second telescopic rod 303 is fixedly connected to the second connecting plate 301.

[0028] Furthermore, such as Figure 3As shown, a first elastic shaft 4 is fixedly connected to the side of the first connecting disc 3 away from the first limiting shaft 203. A limiting band is fixedly connected to the surface of the first elastic shaft 4. A second elastic band 402401 is fixedly connected to the end of the limiting band away from the first elastic band 401. A fixing block 403 is fixedly connected to the side of the second elastic band 402401 away from the elastic band 401.

[0029] Furthermore, such as Figure 4 As shown, the first elastic band 401 and the second elastic band 402401 are symmetrically distributed through the first limiting axis 203.

[0030] Furthermore, such as Figure 1 As shown, the fixing block 403 is fixedly connected to the fixing seat 108.

[0031] Furthermore, such as Figure 1 As shown, a through hole is provided at the top of the second casing 110. A first operating rod 5 is fixedly connected to the through hole. A second operating rod 501 is sleeved on one side of the first operating rod 5. A valve 502 is fixedly connected to one side of the second operating rod 501. During operation, the first operating rod 5 is fixedly connected to the valve 502 in the through hole at the top of the second casing 110, and the second operating rod 501 is sleeved on one side of the first operating rod 5. The operator operates the second operating rod 501 to drive the first operating rod 5 to rotate, thereby controlling the opening and closing of the valve 502. When it is necessary to adjust the flow rate and pressure of the fluid in the casing, the opening degree of the valve 502 is changed by rotating the second operating rod 501, so as to achieve precise control of the fluid and meet the different operational needs in the oil extraction process.

[0032] Working principle: During operation, the first fixing ring 1 is fixed to the wellhead or other related equipment, serving as the starting connection point for the entire casing head. The first fixing shaft 101 is connected to the first fixing ring 1. The fixing plate 102 can rotate relative to the first fixing ring 1 via the first fixing shaft 101. When the angle of the casing head needs to be adjusted, the fixing plate 102 can rotate around the first fixing shaft 101. The other end of the fixing plate 102 is movably connected to the second fixing shaft 103, which is fixed to the second fixing ring 104. This connection method achieves a movable connection between the fixing plate 102 and the second fixing ring 104. The second fixing ring 104 is further connected to the positioning plate 105, which fixes the positioning shaft 106. At a specific location, the positioning rod 107 is inserted into the positioning shaft 106, thereby stably fixing the fixing seat 108 at the wellhead, completing the support and positioning of the first casing 109. During operation, the angle and position can be flexibly adjusted according to actual installation requirements to ensure the casing head is installed securely. The first casing 109 is installed inside the fixing seat 108, serving as the main channel for fluid transportation during oil extraction. The second casing 110 is fitted onto the outside of the first casing 109, forming a relatively sealed space between them. During installation, the first casing 109 is first accurately installed on the fixing seat 108, and then the second casing 110 is carefully fitted onto the first casing 109. The isolation block 111 is installed on one side of the second casing 110. This further enhances the sealing performance between the two casings, preventing fluid leakage. During oil extraction, oil and other fluids are transported upwards through the first casing 109. The second casing 110, together with the isolation block 111, ensures the sealing and safety of the transport process. The first telescopic ring 201 and the second telescopic ring 202 are respectively fitted onto the surfaces of the first casing 109 and the second casing 110, and the first telescopic ring 201 and the second telescopic ring 202 will expand and contract accordingly. The first limiting shaft 203 and the second limiting shaft 204 are respectively fixed on both sides of the first telescopic ring 201 and the second telescopic ring 202. The first limiting plate 205 is movably connected to the first telescopic ring 201 through the first limiting shaft 203, and the second limiting plate 207 is connected through the second limiting shaft 204. Shaft 204 is movably connected to the second telescopic ring 202, and connecting shaft 206 connects the first limiting plate 205 and the second limiting plate 207. When the first telescopic ring 201 or the second telescopic ring 202 extends or retracts, it drives the first limiting shaft 203 and the second limiting shaft 204 to move, thereby causing the first limiting plate 205 and the second limiting plate 207 to rotate around the shaft. The movement of the two is coordinated by connecting shaft 206 to achieve adaptation and protection against sleeve deformation. At the same time, the first connecting plate 3 and the second connecting plate 301 are connected to the first limiting shaft 203 and the second limiting shaft 204 respectively. One end of the first telescopic rod 302 is fixed on the first connecting plate 3, and the other end is sleeved on the second telescopic rod 303. The second telescopic rod 303 is fixed to the second connecting plate 301.When the casing deforms, the first telescopic rod 302 and the second telescopic rod 303 can extend and retract further, enhancing the protection of the casing. Furthermore, the first elastic shaft 4 is fixed to the first connecting disc 3, one end of the limiting band is fixed to the first elastic shaft 4, and the other end is connected to the fixing block 403 via the second elastic band 402401. The fixing block 403 is fixed to the fixing seat 108. When the casing is subjected to significant external force, the limiting band and elastic band 401 can provide additional buffering and limiting effects through elastic deformation, protecting the casing from damage. Inside the through-hole at the top of the second casing 110, the first operating rod 5 is fixedly connected to the valve 502, and the second operating rod 501 is sleeved on one side of the first operating rod 5. Operators can operate the second operating rod 501 to rotate the first operating rod 5, thereby controlling the opening and closing of the valve 502. When it is necessary to adjust the flow rate and pressure of the fluid inside the casing, rotating the second operating rod 501 changes the opening degree of the valve 502, achieving precise control of the fluid and meeting different operational needs in the oil extraction process.

[0033] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model.

Claims

1. A casing head for an oil wellhead, comprising a first retaining ring (1); characterized in that: A first fixed shaft (101) is fixedly connected to one side of the first fixed ring (1). A fixed plate (102) is movably connected to the surface of the first fixed shaft (101). A second fixed shaft (103) is movably connected to one end of the fixed plate (102) away from the first fixed shaft (101). A second fixed ring (104) is fixedly connected to one side of the second fixed shaft (103) away from the fixed plate (102). A positioning plate (105) is fixedly connected to one side of the second fixed ring (104). A positioning shaft (106) is fixedly connected to one side of the positioning plate (105). A positioning rod (107) is provided inside the positioning shaft (106). A fixed seat (108) is fixedly connected to the bottom of the positioning rod (107). A first sleeve (109) is fixedly connected inside the fixed seat (108). A second sleeve (110) is sleeved on one side of the first sleeve (109). An isolation block (111) is fixedly connected to one side of the second sleeve (110).

2. The casing head for an oil wellhead according to claim 1, characterized in that: A fixing disc (2) is fitted onto the surface of the first sleeve (109). A first telescopic ring (201) and a second telescopic ring (202) are fitted onto the surfaces of the first sleeve (109) and the second sleeve (110), respectively. A first limiting shaft (203) and a second limiting shaft (204) are fixedly connected to the two sides of the first telescopic ring (201) and the second telescopic ring (202), respectively. A first limiting plate (205) is movably connected to the surface of the first limiting shaft (203). A connecting shaft (206) is movably connected to the end of the first limiting plate (205) away from the first limiting shaft (203). A second limiting plate (207) is movably connected to the surface of the connecting shaft (206). One end of the second limiting plate (207) is movably connected to the second limiting shaft (204).

3. The casing head for an oil wellhead according to claim 2, characterized in that: A first connecting plate (3) and a second connecting plate (301) are fixedly connected to one side of the first limiting shaft (203) and the second limiting shaft (204), respectively. A first telescopic rod (302) is fixedly connected to the side of the first connecting plate (3) near the second connecting plate (301). A second telescopic rod (303) is sleeved on one end of the first telescopic rod (302). The second telescopic rod (303) is fixedly connected to the second connecting plate (301).

4. The casing head for an oil wellhead according to claim 3, characterized in that: The first connecting plate (3) is fixedly connected to a first elastic shaft (4) on the side away from the first limiting shaft (203). A limiting band is fixedly connected to the surface of the first elastic shaft (4). A second elastic band (402) (401) is fixedly connected to the end of the limiting band away from the first elastic band (401). A fixing block (403) is fixedly connected to the side of the second elastic band (402) (401) away from the elastic band (401).

5. The casing head for an oil wellhead according to claim 4, characterized in that: The first elastic band (401) and the second elastic band (402) are symmetrically distributed through the first limiting axis (203).

6. The casing head for an oil wellhead according to claim 5, characterized in that: The fixing block (403) is fixedly connected to the fixing seat (108).

7. The casing head for an oil wellhead according to claim 6, characterized in that: The top of the second sleeve (110) is provided with a through hole, and a first operating rod (5) is fixedly connected in the through hole. A second operating rod (501) is sleeved on one side of the first operating rod (5), and a valve (502) is fixedly connected to one side of the second operating rod (501).

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