Casing head for preventing leakage of wellhead of oil field

Abstract

The utility model relates to the technical field of casing heads, and discloses a casing head for preventing leakage of an oil field wellhead, which comprises a casing I, a casing II and a connecting cylinder, the top of the casing I is fixedly connected with a flange I, the periphery of the outer wall of the flange I is rotatably connected with a plurality of rotating columns, the interiors of the plurality of rotating columns are in threaded connection with screws, and the connecting cylinder is fixedly connected with the flange II. Sleeves are installed at the upper end and the lower end of the inner wall of the first sleeve, a valve is installed on the front side of the outer wall of the connecting cylinder, the left side of the inner wall of the second sleeve communicates with a barometer, a rotating mechanism is fixedly connected to the outer wall of the connecting cylinder, and the rotating mechanism is used for adjusting and rotating a switch valve. According to the utility model, the outer wall of the sleeve I is provided with the rotating screw for adjusting tightness and convenient disassembly, the sleeves are arranged at the two ends of the inner wall of the sleeve, the sliding strips and the buckles are arranged in the sleeves, rapid fixation is realized through rotation, one side of the sleeve II is connected with the valve, parts are more convenient to maintain and replace, the installation efficiency is high, and the operation steps are simple.

Description

Technical Field

[0001] This utility model relates to the field of casing head technology, and in particular to a casing head for preventing leakage at oilfield wellheads. Background Technology

[0002] The wellhead in an oilfield refers to the installation location of the equipment on the surface part of an oil well, used to control and guide the extraction of oil, gas, and water fluids downhole. It is a key node connecting the oil well to surface facilities. The casing head, which is the lowest part of the wellhead, is used to suspend the casing and seal the wellhead to prevent formation fluid leakage. The casing head connects different sections of the casing.

[0003] The casing head for leak prevention at the wellhead is a key device installed at the bottom of the wellhead. Its main function is to suspend the downhole casing and provide a reliable seal to prevent oil, gas and water from leaking to the surface from the connection between the casing and the wellhead device. It is an important component of the wellhead device and plays a vital role in the safe production and environmental protection of the entire oil well.

[0004] In existing oilfield wellhead leak-proof casing heads, the casing head is located at the bottom of the wellhead. The limited space downhole makes maintenance work very inconvenient. During maintenance, it is difficult for workers to enter the well to operate, requiring the use of special tools and equipment to disassemble and replace components. Moreover, the downhole environment has hazardous factors, increasing the risk of maintenance. The installation of the casing head requires ensuring the installation accuracy of each component. Even a slight deviation in the installation position will affect the stability of the wellhead. The operation procedure is complex, and improper operation can damage the sealing components, thereby causing leakage. Utility Model Content

[0005] To overcome the above shortcomings, this utility model provides a casing head for preventing leakage at oilfield wellheads, aiming to improve the problems of excessive installation precision and complex operation procedures in the prior art.

[0006] To achieve the above objectives, this utility model adopts the following technical solution: a casing head for leak prevention at oilfield wellheads, comprising casing one, casing two, and a connecting cylinder. A flange one is fixedly connected to the top of casing one. Multiple rotating columns are rotatably connected around the outer wall of flange one. Screws are threaded into the interior of each rotating column, and nuts are threaded into the bottom of the outer wall of each screw. Sleeves are installed at the upper and lower ends of the inner wall of casing one. Buckles are fixedly connected to the left and right sides of the bottom of two sleeves. A sealing ring is fixedly connected to the left side of the outer wall of each buckle. A sliding strip is installed at one end of the inner wall of each sleeve. Casing one is positioned at the top of the outer wall of casing two. A flange two is fixedly connected to the top of casing two. The connecting cylinder is connected to the right side of the inner wall of casing two. A valve is installed on the front side of the outer wall of the connecting cylinder. A pressure gauge is connected to the left side of the inner wall of casing two. A rotating mechanism is fixedly connected to the outer wall of the connecting cylinder. The rotating mechanism is used to adjust and rotate the valve.

[0007] As a further description of the above technical solution:

[0008] The rotating mechanism includes a frame, which is fixedly connected to the outer wall of the connecting cylinder. A motor is fixedly connected to the top front side of the frame. A turntable is fixedly connected to the output end of the motor. A support rod is rotatably connected to the outer wall of the turntable. An auxiliary plate is rotatably connected to the other end of the support rod. Connecting buckles are fixedly connected to the left and right sides of the outer wall of the auxiliary plate. Bolts are bolted to the inner walls of the two connecting buckles.

[0009] As a further description of the above technical solution:

[0010] A buffer pad is fixedly connected to the top of the outer wall of the frame, and four bolts are threaded to the four corners of the buffer pad.

[0011] As a further description of the above technical solution:

[0012] Bolt 2 is installed on the right end of the outer wall of the connecting cylinder, and flange 3 is threadedly connected to the outer wall of bolt 2.

[0013] As a further description of the above technical solution:

[0014] The barometer has a scale installed on the top of its inner wall, and a pointer is provided on the outer wall of the scale.

[0015] As a further description of the above technical solution:

[0016] The bottom of the first sleeve is fixedly connected to a support, and the bottom end of the support is fixedly connected to a base.

[0017] As a further description of the above technical solution:

[0018] The upper middle part of the first sleeve is fixedly connected to the left and right sides with fixing blocks, and the inner wall of the fixing blocks is rotatably connected to lifting rings.

[0019] As a further description of the above technical solution:

[0020] A funnel sleeve is installed on the top of the outer wall of the first sleeve, and multiple bolts are threaded to the bottom of the outer wall of the funnel sleeve.

[0021] This utility model has the following beneficial effects:

[0022] 1. In this utility model, the outer wall of the first sleeve has a rotating screw for adjusting the tightness and facilitating disassembly. The inner wall of the sleeve is equipped with sleeves at both ends, and the sleeves contain slides and buckles. Quick fixation is achieved by rotation. The second sleeve is connected to a valve on one side and a pressure gauge on the other side, making maintenance and replacement of parts more convenient, installation more efficient, and operation simple.

[0023] 2. In this utility model, a motor is installed on the top of the frame to pull the auxiliary plate to rotate. The connecting buckles on both sides of the auxiliary plate are used to fix the valve handle, ensuring that the rotating mechanism can effectively rotate the valve, reducing manual opening and closing of the valve, providing convenience for closing the wellhead, avoiding the situation where the valve cannot be opened in an emergency, and increasing the safety of the equipment. Attached Figure Description

[0024] Figure 1 This is a perspective view of the casing head for preventing leakage at oilfield wellheads proposed in this utility model;

[0025] Figure 2 This is a front view of the casing head for preventing leakage at oilfield wellheads proposed in this utility model;

[0026] Figure 3 This is a top view of the casing head for preventing leakage at oilfield wellheads proposed in this utility model;

[0027] Figure 4 This is a partial structural breakdown diagram of the casing head for leak prevention at oilfield wellheads proposed in this utility model;

[0028] Figure 5 This is an exploded view of the rotating mechanism of the casing head for preventing leakage at oilfield wellheads, as proposed in this utility model.

[0029] Legend:

[0030] 1. Sleeve 1; 2. Rotating mechanism; 201. Frame; 202. Motor; 203. Turntable; 204. Support rod; 205. Auxiliary plate; 206. Connecting buckle; 207. Bolt 1; 3. Flange 1; 4. Rotating column; 5. Screw; 6. Nut; 7. Sleeve; 8. Snap-fit; 9. Sealing ring; 10. Sliding strip; 11. Sleeve 2; 12. Flange 2; 13. Connecting cylinder; 14. Valve; 15. Pressure gauge; 16. Dial; 17. Pointer; 18. Bolt 2; 19. Flange 3; 20. Base; 21. Support; 22. Funnel sleeve; 23. Bolt 3; 24. Fixing block; 25. Lifting ring; 26. Buffer pad; 27. Bolt 4. Detailed Implementation

[0031] 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 of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0032] Reference Figure 1 , Figure 2 and Figure 4 This utility model provides an embodiment of a casing head for leak prevention at oilfield wellheads, comprising a casing 1, a casing 2 11, and a connecting sleeve 13. A flange 3 is fixedly connected to the top of casing 1. Multiple rotating posts 4 are rotatably connected around the outer wall of flange 3. Screws 5 are threaded into the interior of the rotating posts 4. Nuts 6 are threaded into the bottom of the outer wall of the screws 5. Sleeves 7 are installed at both the upper and lower ends of the inner wall of casing 1. Clips 8 are fixedly connected to the left and right sides of the bottom of the two sleeves 7. A sealing ring 9 is fixedly connected to the left side of the outer wall of the clips 8. A sliding strip 10 is installed at one end of the inner wall of the sleeve 1. The sleeve 1 is set at the top of the outer wall of the sleeve 2 11. The top of the sleeve 2 11 is fixedly connected to the flange 2 12. The right side of the inner wall of the sleeve 2 11 is connected to the connecting cylinder 13. The front side of the outer wall of the connecting cylinder 13 is equipped with a valve 14. The left side of the inner wall of the sleeve 2 11 is connected to the pressure gauge 15. The outer wall of the connecting cylinder 13 is fixedly connected to the rotating mechanism 2. The rotating mechanism 2 is used to adjust the rotating switch valve. The top of the outer wall of the sleeve 1 is equipped with a funnel sleeve 22. The bottom of the outer wall of the funnel sleeve 22 is threaded with multiple bolts 3 23.

[0033] Specifically, a flange 3 is fixedly connected to the top of sleeve 1. Multiple rotating columns 4 are rotatably connected around the outer wall of flange 3. Screws 5 are threaded into the interior of each rotating column 4. Rotating the adjusting screws 5 increases structural flexibility. Nuts 6 are threaded into the bottom of the outer wall of the screws 5 to adjust the tightness of the sleeve head and facilitate quick disassembly, increasing structural convenience. Sleeves 7 are installed at both the upper and lower ends of the inner wall of sleeve 1. Clips 8 are fixedly connected to the left and right sides of the bottom of both sleeves 7. A sliding strip 10 is installed at one end inside the sleeve 7. Rotating the sleeve 7 while rotating the sleeve 7 rotates the clips 8, causing the clips 8 to contact the sliding strip 10 on one side. Rotating to the bottom achieves the effect of fixing the sleeve 7. Pipe 1 is located on the top of the outer wall of sleeve 2 11. Flange 2 12 is fixedly connected to the top of sleeve 2 11 for easy fixing with screw 5 and clamping with nut 6. The right side of the inner wall of sleeve 2 11 is connected to connecting cylinder 13. A valve 14 is installed on the front side of the outer wall of connecting cylinder 13 to achieve the function of closing and throttling. The left side of the inner wall of sleeve 2 11 is connected to pressure gauge 15 to monitor the internal pressure at all times to prevent leakage. The outer wall of connecting cylinder 13 is fixedly connected to rotating mechanism 2, which is used to adjust the rotary switch valve. A funnel sleeve 22 is installed on the top of the outer wall of sleeve 1. Multiple bolts 3 23 are threadedly connected to the bottom of the outer wall of funnel sleeve 22 to facilitate quick docking of the sleeve head and the sleeve, improving work efficiency.

[0034] Reference Figure 2 , Figure 3 and Figure 5 The rotating mechanism 2 includes a frame 201, which is fixedly connected to the outer wall of the connecting cylinder 13. A motor 202 is fixedly connected to the top front side of the frame 201. A turntable 203 is fixedly connected to the output end of the motor 202. A support rod 204 is rotatably connected to the outer wall of the turntable 203. An auxiliary disk 205 is rotatably connected to the other end of the support rod 204. Connecting buckles 206 are fixedly connected to the left and right sides of the outer wall of the auxiliary disk 205. Bolt 1 207 is bolted to the inner wall of the two connecting buckles 206. A buffer pad 26 is fixedly connected to the top of the outer wall of the frame 201. Bolt 4 27 is threaded to the four corners of the buffer pad 26. Bolt 2 18 is installed on the right end of the outer wall of the connecting cylinder 13. Flange 3 19 is threaded to the outer wall of Bolt 2 18.

[0035] Specifically, the rotating mechanism 2 includes a frame 201, which is fixedly connected to the outer wall of the connecting cylinder 13 to provide a stable foundation. A motor 202 is installed on the top front side of the frame 201, providing power to drive the turntable 203. The output end of the motor 202 is fixedly connected to the turntable 203. A support rod 204 is rotatably connected to the outer wall of the turntable 203, and an auxiliary disk 205 is rotatably connected to the other end of the support rod 204. During rotation, the support rod 204 pulls the auxiliary disk 205 back to rotate. Connecting buckles 206 are fixedly connected to both sides of the outer wall of the auxiliary disk 205, and the connecting buckles 206 are connected to bolts 207 via inner wall bolts. The valve 14 handle is fixed to the top of the outer wall of the frame 201 to achieve the purpose of rotating the valve 14. A buffer pad 26 is also fixedly connected to the top of the outer wall of the frame 201. The design of the buffer pad 26 is to absorb and reduce the vibration and impact generated during the rotation of the motor 202, thereby protecting the sleeve head from damage. The four corners of the buffer pad 26 are fixed with bolts 27 by threaded connection. Bolts 27 enhance the stability of the buffer pad 26. On the right end of the outer wall of the connecting cylinder 13, bolt 18 is installed. Bolt 18 is connected to flange 19 by threaded connection on the outer wall. The design of flange 19 enhances the structural strength of the connecting cylinder 13 and can connect to other equipment, increasing the convenience of the equipment.

[0036] Reference Figure 1 , Figure 2 and Figure 3 The inner wall of the pressure gauge 15 is equipped with a scale 16, and the outer wall of the scale 16 is equipped with a pointer 17. The bottom of the sleeve 1 is fixedly connected to a support 21, and the bottom end of the support 21 is fixedly connected to a base 20. The upper middle part of the sleeve 1 is fixedly connected to both the left and right sides with fixing blocks 24, and the inner wall of the fixing block 24 is rotatably connected to a lifting ring 25.

[0037] Specifically, the inner wall of the barometer 15 is equipped with a dial 16, and a pointer 17 is also set on the outer wall of the dial 16. The pointer 17 and the dial 16 are used to indicate the change of air pressure and provide users with intuitive readings. In addition, the bottom of the sleeve 1 is fixedly connected to a support 21. The support 21 not only stabilizes the entire barometer 15, but also has a base 20 fixedly connected to its bottom end. The design of the base 20 allows the entire barometer 15 to be placed stably on a flat surface, ensuring the stability of operation. Two fixing blocks 24 are fixedly connected to the left and right sides of the upper middle part of the sleeve 1, and a lifting ring 25 is rotatably connected to its inner wall for easy transport and hanging of the sleeve head.

[0038] Working principle: A flange 3 is fixedly connected to the bottom of sleeve 1. A rotating column 4 is rotatably connected around the outer wall of flange 3. A screw 5 is threaded inside the rotating column 4, allowing adjustment of the screw 5's length for a tighter connection to sleeve 1. The rotatable rotating column 4 also allows for easy removal of the screw 5. A nut 6 rotates to the top of the rotating column 4, tightening the screw 5. A sleeve 7 is installed inside sleeve 1. Two sleeves 7 align with a clip 8 at one end of the rotating sleeve 7, allowing the clip 8 to engage with the seal. The ring 9 engages to achieve quick docking. An internal sealing ring 9 is installed to increase the structural sealing and prevent internal material leakage. The top of the second sleeve 11 is fixedly connected to the second flange 12. The second flange 12 can prevent the nut 6 from rotating upward, thereby tightening the tightness between the first sleeve 1 and the second sleeve 11. The right side of the second sleeve 11 is connected to the connecting cylinder 13. The front end of the connecting cylinder 13 is equipped with a valve 14 to open and close the sleeve head. The left side of the second sleeve 11 is connected to the pressure gauge 15 to detect whether there is any air leakage inside the first sleeve 1 and the air pressure.

[0039] The frame 201 is fixedly connected to the outer wall of the connecting cylinder 13, providing support 21 for the motor 202 and ensuring the stability of the motor 202. The motor 202 is fixed to the top front side of the frame 201. The output end of the turntable 203 is fixed with the turntable 203. The support rod 204 is rotatably connected to the outer wall of the turntable 203. During the rotation, the support rod 204 pulls the auxiliary plate 205 back and forth, causing it to rotate accordingly, saving labor costs and ensuring the smoothness of the movement. The left and right sides of the outer wall of the auxiliary plate 205 are fixedly connected with connecting buckles 206. The connecting buckles 206 are connected to bolts 207 by bolts on the inner wall, thereby fixing the handle of the valve 14. After fixing the handle, the motor 202 is started, driving the valve 14 to rotate, avoiding labor costs and making maintenance more convenient.

[0040] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A casing head for preventing leakage at oilfield wellheads, comprising casing one (1), casing two (11) and connecting sleeve (13), characterized in that: The top of the sleeve (1) is fixedly connected to a flange (3). Multiple rotating columns (4) are rotatably connected around the outer wall of the flange (3). Screws (5) are threaded into the interior of each rotating column (4). Nuts (6) are threaded into the bottom of the outer wall of each screw (5). Sleeves (7) are installed at both the upper and lower ends of the inner wall of the sleeve (1). Buckles (8) are fixedly connected to the left and right sides of the bottom of each sleeve (7). A sealing ring (9) is fixedly connected to the left side of the outer wall of each buckle (8). The sleeve (7)... A slide bar (10) is installed at one end of the inner sleeve. The first sleeve (1) is set on the top of the outer wall of the second sleeve (11). The top of the second sleeve (11) is fixedly connected to the flange (12). The right side of the inner wall of the second sleeve (11) is connected to the connecting cylinder (13). A valve (14) is installed on the front side of the outer wall of the connecting cylinder (13). A pressure gauge (15) is connected to the left side of the inner wall of the second sleeve (11). A rotating mechanism (2) is fixedly connected to the outer wall of the connecting cylinder (13). The rotating mechanism (2) is used to adjust the rotating switch valve.

2. The casing head for leak prevention at oilfield wellheads according to claim 1, characterized in that: The rotating mechanism (2) includes a frame (201), which is fixedly connected to the outer wall of the connecting cylinder (13). A motor (202) is fixedly connected to the top front side of the frame (201). A turntable (203) is fixedly connected to the output end of the motor (202). A support rod (204) is rotatably connected to the outer wall of the turntable (203). An auxiliary disk (205) is rotatably connected to the other end of the support rod (204). Connecting buckles (206) are fixedly connected to the left and right sides of the outer wall of the auxiliary disk (205). Bolts (207) are bolted to the inner walls of the two connecting buckles (206).

3. The casing head for leak prevention at oilfield wellheads according to claim 2, characterized in that: A buffer pad (26) is fixedly connected to the top of the outer wall of the frame (201), and bolts (27) are threadedly connected to the four corners of the buffer pad (26).

4. The casing head for leak prevention at oilfield wellheads according to claim 1, characterized in that: Bolt 2 (18) is installed on the right end of the outer wall of the connecting cylinder (13), and flange 3 (19) is threadedly connected to the outer wall of bolt 2 (18).

5. The casing head for leak prevention at oilfield wellheads according to claim 1, characterized in that: The barometer (15) has a dial (16) installed on the top of its inner wall, and a pointer (17) is provided on the outer wall of the dial (16).

6. The casing head for leak prevention at oilfield wellheads according to claim 1, characterized in that: The bottom of the sleeve (1) is fixedly connected to a support (21), and the bottom end of the support (21) is fixedly connected to a base (20).

7. The casing head for leak prevention at oilfield wellheads according to claim 1, characterized in that: The upper middle part of the sleeve (1) is fixedly connected to the left and right sides of the sleeve, and the inner wall of the fixed block (24) is rotatably connected to the lifting ring (25).

8. The casing head for leak prevention at oilfield wellheads according to claim 1, characterized in that: The top of the outer wall of the sleeve (1) is fitted with a funnel sleeve (22), and the bottom of the outer wall of the funnel sleeve (22) is threaded with multiple bolts (23).

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