Multifunctional wellhead sealing device
By designing a multi-function wellhead sealing device, using conical packings and multiple sealing structures, the leakage problem caused by packing wear during long-term operation of the wellhead equipment is solved, the replacement process is simplified, downtime and cost is reduced, and the wellhead is ensured. Safety and sealing.
Patent Information
- Application Number
- CN202421227836.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-31
- Publication Date
- 2025-01-10
- Estimated Expiration
- Not applicable · inactive patent
AI Technical Summary
After the wellhead equipment is operated for a long time, the pack wear will cause oil and gas leakage inside the wellhead. The process of replacing the pack in the existing technology is complicated, which may lead to extended downtime and increased costs. Improper replacement may lead to incomplete seals or leakage.
Design a multi-functional wellhead sealing device, including base, packing cylinder, bare rod, rubber cylinder, ball seat, nylon brace and sealing ring, adopts a tapered packing design and multiple sealing structures, suitable for different degrees of bias Incline wellhead and enhance the sealing effect without destroying the existing structure through simple operation.
It realizes the reduction of leakage during long-term operation, reduces downtime and cost, ensures the safety, reliability and sealing of equipment, and is suitable for different degrees of deflected wellheads, simplifies the maintenance process and reduces production losses.
Smart Images
Figure CN222333744U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of wellhead sealing, in particular to a multifunctional wellhead sealing device. Background Art
[0002] In recent years, large-scale production of extra-heavy oil in oil fields has mainly relied on mechanical oil production, and the main technology currently used is rod pumping. The pumping rod is an important component of mechanical oil production, and the pumping rod packing is a key component to achieve dynamic sealing when the pumping rod moves up and down. However, after the super-heavy oil thermal production well is switched to pumping, with the long-term operation of the wellhead equipment, the packing box leaks more and more seriously, and the packing is replaced more and more frequently. In addition to the normal wear of the pumping packing, the continuous wear of the rod is the main cause of leakage.
[0003] With the long-term operation of the wellhead equipment, as the packing in the wellhead sealing device wears, it will cause leakage of oil and gas inside the wellhead. In the prior art, the packing that has lost its sealing effect in the sealing device is usually replaced. Since the process of replacing the packing is relatively complicated, it may require longer downtime. In oil fields or industrial applications, downtime means production loss and increased costs. If the packing is not properly installed or sealed during replacement, it may cause incomplete sealing or leakage. This may require further inspection and repair, which adds additional costs and downtime. In view of the above problems, a multifunctional wellhead sealing device is proposed to solve them. Utility Model Content
[0004] In order to solve the above technical problems, a multifunctional wellhead sealing device is provided, which solves the above-mentioned problem that as the wellhead equipment is operated for a long time, as the packing in the wellhead sealing device wears, it will cause leakage of oil and gas inside the wellhead. In the prior art, the packing that has lost its sealing effect in the sealing device is usually replaced. Since the process of replacing the packing is relatively complicated, it may require longer downtime. In oilfield or industrial applications, downtime means production loss and increased costs. If the packing is not properly installed or sealed during replacement, it may cause incomplete sealing or leakage. This may require further inspection and repair, adding additional costs and downtime.
[0005] To achieve the above objectives, the technical solution adopted by the utility model is: a multifunctional wellhead sealing device, comprising a base and a packing tube, a polished rod is arranged inside the packing tube, a rubber tube is fixedly connected to the top of the base, a ball seat is fixedly connected to the top of the rubber tube, the bottom end of the packing tube is fixedly connected to the inside of the ball seat, straight packing and conical packing are arranged above the packing tube and the polished rod, the conical packing is arranged at the inner lower end of the packing tube, and the shape of the conical packing is fitted with the inner wall of the lower end of the packing tube, nylon sleeves are arranged inside the packing tube and outside the polished rod, a packing pressure cap is arranged between the packing tube and the nylon sleeve, and a packing lock nut is threadedly connected to the outside of the packing tube.
[0006] Preferably, a second sealing ring is clamped between the ball seat and the packing tube, a ball seat lock nut is threadedly connected to the outer side of the ball seat, and a packing ejection sleeve is arranged below the packing tube and the polished rod.
[0007] Preferably, the left and right ends of the rubber tube are fixedly connected with rubber tube lock nuts, the middle parts of the two rubber tube lock nuts are threadedly connected with screws, and air release holes are opened on the tops of the two rubber tube lock nuts.
[0008] Preferably, the surface of the screw and the inner thread of the rubber tube lock nut are connected with a screw lock nut, and a valve core is arranged between the screw lock nut and the inner wall of the rubber tube.
[0009] Preferably, a first sealing ring is provided between the valve core and the rubber tube.
[0010] Preferably, a clamp connection is fixedly installed on the outer bottom end of the base.
[0011] Preferably, the base and the rubber tube are an integral structure.
[0012] Compared with the prior art, the advantages of the utility model are:
[0013] 1. Safe and reliable: Made of high-strength materials and with multiple built-in sealing structures, it can withstand high pressure and high temperature to avoid leakage and accidents.
[0014] 2. Strong sealing: There are multiple groups of packings inside, among which the bottom is conical packing, which can ensure the problem of excessive gap and sealing failure due to wear in long-term operation.
[0015] 3. Wide application range: It has anti-eccentric wear function and can be applied to wellheads with different degrees of deflection.
[0016] 4. Easy maintenance: The tapered mouth design inside this product effectively solves the problem of replacing ordinary packing after wear and failure. You only need to add new packing without taking out the old packing. Since the operation of adding new packing is relatively simple, the required downtime is usually shorter. Reducing downtime can reduce production losses and costs. By adding new packing, the sealing effect can be enhanced without destroying the existing sealing structure. This helps maintain the integrity and reliability of the system and ensures that the equipment can operate normally at critical moments. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 It is a schematic diagram of the structure of the utility model;
[0018] Figure 2 for Figure 1 A partial enlarged view of the middle A;
[0019] Figure 3 for Figure 1 A partial enlarged view of point B in the middle.
[0020] The numbers in the figure are:
[0021] 1. Packing lock nut; 2. Packing pressure cap; 3. Nylon sleeve; 4. Packing tube; 5. Straight packing; 6. Conical packing; 7. Ball seat lock nut; 8. Packing ejector sleeve; 9. Ball seat; 10. Valve core; 11. Screw lock nut; 12. Screw; 13. Rubber tube lock nut; 14. Rubber tube; 15. Clamp connection; 16. Base; 17. Bare rod; 18. First sealing ring; 19. Second sealing ring. DETAILED DESCRIPTION
[0022] The following description is used to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments described below are only examples, and those skilled in the art may think of other obvious variations.
[0023] Reference Figure 1-3As shown, a multifunctional wellhead sealing device comprises a base 16 and a packing tube 4, a polished rod 17 is arranged inside the packing tube 4, a rubber tube 14 is fixedly connected above the base 16, a ball seat 9 is fixedly connected to the top of the rubber tube 14, and the bottom end of the packing tube 4 is fixedly connected to the inside of the ball seat 9, a straight packing 5 and a conical packing 6 are arranged above the packing tube 4 and the polished rod 17, the conical packing 6 is arranged at the inner lower end of the packing tube 4, and the shape of the conical packing 6 is fitted with the inner wall of the lower end of the packing tube 4, a nylon sleeve 3 is sleeved inside the packing tube 4 and on the outer side of the polished rod 17, a packing pressure cap 2 is arranged between the packing tube 4 and the nylon sleeve 3, a packing lock nut 1 is threadedly connected to the outer side of the packing tube 4, multiple groups of straight packings 5 and conical packings 6 are arranged in the packing tube 4, and the lower part adopts a conical mouth design, which prolongs the maintenance cycle and strengthens the sealing effect, can effectively prevent overflow and leakage of the wellhead, and ensure the safety and efficiency of the production process.
[0024] It is worth mentioning that a second sealing ring 19 is clamped between the ball seat 9 and the packing tube 4, a ball seat lock nut 7 is threadedly connected to the outer side of the ball seat 9, a packing ejection sleeve 8 is arranged below the packing tube 4 and the light rod 17, and the connection between the packing tube 4 and the ball seat 9 is a spherical contact, which can be tilted at a certain angle, and is suitable for installation at wellheads with different degrees of deflection.
[0025] Specifically, the left and right ends of the rubber tube 14 are fixedly connected with rubber tube lock nuts 13, the middle parts of the two rubber tube lock nuts 13 are threadedly connected with screws 12, and air vents are opened above the two rubber tube lock nuts 13. When the pressure in the rubber tube 14 is relatively high, the pressure in the sealing device can be released through the air vents.
[0026] Specifically, a screw lock nut 11 is threadedly connected between the surface of the screw 12 and the inner surface of the rubber tube lock nut 13 , and a valve core 10 is arranged between the screw lock nut 11 and the inner wall of the rubber tube 14 .
[0027] Specifically, a first sealing ring 18 is disposed between the valve core 10 and the rubber tube 14. The first sealing ring 18 can form an almost impenetrable sealing layer through its good elasticity and sealing performance, thereby effectively preventing the medium from leaking out of the valve.
[0028] In one of the embodiments, a clamp connection 15 is fixedly installed at the bottom end of the outer side of the base 16. The installation using the clamp does not require welding and can be completed using simple tools and techniques, which greatly reduces the difficulty of installation and improves work efficiency. The clamp has a compact structure and can effectively prevent pipe leakage, rupture, etc., and improve the stability and safety of the system.
[0029] Preferably, the base 16 and the rubber tube 14 are an integrated structure, which can reduce the sealing structure of the base 16 and the rubber tube 14, making the structure compact and saving costs.
[0030] Working principle: During installation, first install the clamp connection 15 with the wellhead, adjust the direction and fix it, then remove the packing lock nut 1, lift the packing pressure cap 2 and insert it into the polished rod 17, then install the tapered packing 6 and the straight packing 5 into the packing tube 4 in the order of tapered packing 6 at the bottom and straight packing 5 at the top, and press the nylon sleeve 3 on the top of the straight packing 5. After adjusting the tapered packing 6 and the straight packing 5 to the appropriate position with the polished rod 17, install the packing pressure cap 2 into the packing tube 4, and turn the packing lock nut 1 clockwise to a slightly tight state, start the machine for trial operation, and adjust the tightness of the tapered packing 6 and the straight packing 5 after several cycles to ensure that there is no oil or gas leakage. The installation work is now completed.
[0031] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and the specification only describe the principles of the utility model. The utility model may be subject to various changes and improvements without departing from the spirit and scope of the utility model. These changes and improvements fall within the scope of the utility model to be protected. The scope of protection claimed by the utility model is defined by the attached claims and their equivalents.
Claims
1. A multifunctional wellhead sealing device, characterized in that: The invention comprises a base (16) and a packing tube (4), wherein a bare rod (17) is arranged inside the packing tube (4), a rubber tube (14) is fixedly connected above the base (16), a ball seat (9) is fixedly connected to the top of the rubber tube (14), a bottom end of the packing tube (4) is fixedly connected to the inside of the ball seat (9), a straight packing (5) and a conical packing (6) are arranged above the packing tube (4) and the bare rod (17), the conical packing (6) is arranged at the lower end of the packing tube (4), and the shape of the conical packing (6) is in contact with the inner wall of the lower end of the packing tube (4), a nylon sleeve (3) is sleeved inside the packing tube (4) and outside the bare rod (17), a packing pressure cap (2) is arranged between the packing tube (4) and the nylon sleeve (3), and a packing lock nut (1) is threadedly connected to the outside of the packing tube (4).
2. A multifunctional wellhead sealing device according to claim 1, characterized in that: A second sealing ring (19) is clamped between the ball seat (9) and the packing tube (4), a ball seat lock nut (7) is threadedly connected to the outer side of the ball seat (9), and a packing ejection sleeve (8) is arranged below the packing tube (4) and the polished rod (17).
3. A multifunctional wellhead sealing device according to claim 1, characterized in that: The left and right ends of the rubber tube (14) are fixedly connected with rubber tube lock nuts (13), the middle parts of the two rubber tube lock nuts (13) are threadedly connected with screw rods (12), and air release holes are opened on the tops of the two rubber tube lock nuts (13).
4. A multifunctional wellhead sealing device according to claim 3, characterized in that: The surface of the screw (12) is threadedly connected to the inner surface of the rubber tube lock nut (13) with a screw lock nut (11), and a valve core (10) is arranged between the screw lock nut (11) and the inner wall of the rubber tube (14).
5. A multifunctional wellhead sealing device according to claim 4, characterized in that: A first sealing ring (18) is provided between the valve core (10) and the rubber tube (14).
6. A multifunctional wellhead sealing device according to claim 1, characterized in that: A clamp connection (15) is fixedly mounted on the outer bottom end of the base (16).
7. The multifunctional wellhead sealing device according to claim 1, characterized in that: The base (16) and the rubber tube (14) are an integrated structure.