Oil well mouth injection type split sealing device

Abstract

The utility model discloses an oil well mouth injection type split sealing device which comprises a sealing body, a body pressing cap is arranged at the upper end of the inner wall of the sealing body, the sealing body is in a split type, and the body pressing cap is in a split type. A fastening assembly is arranged at the lower end of the sealing body and can be fixed to a leakage pressing cap or a pipe body of the leakage wellhead sealer. The split type sealing device is of a split type structure, the split design is adopted in the structure, installation is convenient and fast, and during installation, the two half sealing bodies of the device are placed on a packing box, and fastening bolts are screwed on the two half sealing bodies. The split type body pressing cap is adopted, during sealing, the end face can be rotated for sealing, the internal sealing filler is pressed and compacted, after the split type body pressing cap is used for a period of time, when the sealing filler is consumed, the split type sealing pressing cap can be continuously screwed, and the better sealing effect is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of wellhead sealing, in particular to an injection type split sealing device for an oil well wellhead. Background Art

[0002] At present, the oil production equipment in oil fields mainly consists of screw pump wells, pumping unit wells, electric pump wells, etc. In a pumping unit well, the polished rod reciprocates through the walking beam, continuously lifting the crude oil in the oil layer to the ground. Due to the reciprocating movement of the polished rod rubbing against the packing, after a long time of production, the sealing performance of the wellhead packing box deteriorates, leakage is likely to occur, and the packing needs to be frequently replaced.

[0003] In a screw pump well, the screw rotates to drive the liquid to be produced to the ground. The polished rod at the screw pump wellhead continuously rotates and rubs against the packing. After a period of production, the packing wears, resulting in frequent leakage at the wellhead. The structure of the screw pump wellhead is special and the space is limited. It is difficult to take out and replace the packing, with high labor intensity and a long time for each replacement of the packing, affecting the production efficiency of crude oil. Due to the narrow operation space, the replacement effect is also not good, and leakage often cannot be effectively treated after replacing the packing. Therefore, higher requirements are imposed on the wear resistance and sealing performance of the wellhead packing.

[0004] For an oil well with both pumping and spraying, if the packing box is damaged or the polished rod is corroded, resulting in leakage at the wellhead, it is necessary to kill the well to replace the packing box or the polished rod. This not only greatly increases the cost but also poses certain safety hazards.

[0005] In order to solve the above problems, it is necessary to develop a set of wellhead sealing devices with a simple structure, no need to replace the packing, good sealing effect, and easy to install in the limited wellhead space.

[0006] Publication No.: CN220621808U discloses a detachable regional treatment wellhead sealing device, including: a chassis, a drill pipe, two well sealing mechanisms, two adjustable sealing mechanisms, and a casing connection mechanism. The two well sealing mechanisms are symmetrically and movably arranged on the top surface of the chassis. The casing connection mechanism is arranged on the bottom surface of the chassis. The two adjustable sealing mechanisms form an annular structure. On the one hand, the sealing ring is beneficial to cooperate with the sealing gasket to achieve a sealed connection with the drill pipe. On the other hand, through the detachable connection, it is beneficial to improve the adaptability of the entire well sealing device.

[0007] Publication No.: CN207177807U discloses a blowout preventer for steam injection wellhead, including: a fixing mechanism formed by connecting a first fixed half-frame and a second fixed half-frame in a detachable connection manner, a guiding groove is formed in the fixing mechanism; a limiting member is arranged at an opening of the fixing mechanism close to the guiding groove; a movable mechanism formed by connecting a first half-cover and a second half-cover in a detachable connection manner; the movable mechanism has an opposite top cover and a side wall surrounding the top cover; a sealing hole for mating with a casing nipple is formed in the top cover.

[0008] Publication No.: CN105888598A discloses a wellhead sealing device, including a reducing flange body whose upper and lower ends are respectively fixedly connected to a mandrel suspension casing head and a gas injection wellhead four-way through carrier bolts II and carrier bolts I, and further includes a casing body, a casing collar, an annular steel plate and a sealing ring integrally arranged at the same axis position of the reducing flange body. The casing collar is threadedly connected to the casing body, the annular steel plate is a combined structure of two semi-circles, which is combined and sleeved on the lower end of the casing body and placed at a position closely fitted with the lower end face of the casing collar, and the sealing ring is sleeved on the casing collar.

[0009] The above-mentioned prior arts all use split seals, but cannot be combined with existing sealers and cannot be installed on the upper end of a leaking sealer.

[0010] In summary, the technical solutions, the technical problems to be solved and the beneficial effects generated by the above-mentioned disclosed technologies are all different from those of the present utility model. For more technical features, technical problems to be solved and beneficial effects of the present utility model, there is no technical inspiration in the above-mentioned disclosed technical documents. Summary of the Invention

[0011] Aiming at the above-mentioned defects existing in the prior art, the purpose of the present utility model is to provide an injection type split seal device for oil well wellhead.

[0012] In order to achieve the above purpose, the present utility model adopts the following technical solutions:

[0013] An injection type split seal device for oil well wellhead, including a seal body, a body press cap is arranged at the upper end of the inner wall of the seal body, the seal body is of split type, and the body press cap is of split type; a fastening component is arranged at the lower end of the seal body, and the fastening component can be fixed to the leakage press cap or the pipe body of a leaking wellhead sealer.

[0014] Further, an end cover is arranged on the outer wall at the lower end of the seal body, a retaining ring is arranged at the lower end of the inner wall of the seal body, an end face sealing ring is arranged at the lower end face of the seal body, and the end cover is connected to the fastening component.

[0015] Further, the sealing body is circular tubular, and the sealing body includes a first semi-sealing body and a second semi-sealing body;

[0016] Specifically, a body bump is provided on the joint surface of the first semi-sealing body, and a body groove is provided on the joint surface of the second semi-sealing body. The body bump and the body groove are fitted together to join the first semi-sealing body and the second semi-sealing body;

[0017] Specifically, the first semi-sealing body and the second semi-sealing body are fastened by fixing screws, and are sealed by a sealing strip between the first semi-sealing body and the second semi-sealing body.

[0018] Further, a limit ring is provided on the outer wall of the upper end of the body pressing cap, and a pressing cap sealing washer is provided at the lower end of the body pressing cap;

[0019] Specifically, the body pressing cap includes a first semi-pressing cap and a second semi-pressing cap. A pressing cap groove is provided on the joint surface of the first semi-pressing cap, and a pressing cap bump is provided on the joint surface of the second semi-pressing cap. The pressing cap groove and the pressing cap bump join the first semi-pressing cap and the second semi-pressing cap together.

[0020] Further, the body bump is a body dovetail bump, and the body groove is a body dovetail groove; the pressing cap bump is a pressing cap dovetail bump, and the pressing cap groove is a pressing cap dovetail groove.

[0021] Further, an internal thread of the body is provided at the upper end of the sealing body, and an external thread of the pressing cap is provided at the lower end of the outer wall of the body pressing cap. The internal thread of the body is connected to the external thread of the pressing cap.

[0022] Further, the fastening assembly includes two fastening blocks;

[0023] Specifically, a clamping groove is provided on the fastening block, a chuck tooth is provided in the clamping groove, a transverse locking bolt hole is provided on the fastening block, and a longitudinal bolt fixing hole is provided on the fastening block;

[0024] Specifically, a longitudinal bolt adjusting hole is provided on the end cover;

[0025] Specifically, the transverse locking bolt holes of the two fastening blocks are connected by a transverse bolt, and the longitudinal bolt fixing holes and the longitudinal bolt adjusting holes are connected by a longitudinal bolt.

[0026] Further, the clamping groove is trapezoidal or V-shaped.

[0027] Further, an injection assembly is provided on the side wall of the sealing body, and the injection assembly is communicated with the inside of the sealing body;

[0028] Specifically, the injection assembly includes an injection cylinder, an injection cylinder pressing cap, and a lead screw type injection tube piston;

[0029] Specifically, an injection hole is provided on the side wall of the sealing body, and the injection cylinder is fixedly connected to the injection hole; the injection cylinder pressing cap is arranged at the port of the injection cylinder, and a threaded hole is provided at the center of the injection cylinder pressing cap; the screw-type injection pipe piston includes a piston, a screw rod, and a tool handle connected in sequence. The screw rod is connected to the threaded hole of the injection cylinder pressing cap, the piston is located inside the injection cylinder, and the piston seals the injection cylinder.

[0030] Further, the injection hole is provided on the first half-sealing body or / and the second half-sealing body.

[0031] The utility model has the following beneficial effects compared with the prior art:

[0032] 1. The utility model adopts a split structure, and both the structures adopt a split design, which is convenient and fast to install. During installation, place the two half-sealing bodies of the device on the packing box and tighten the fastening bolts.

[0033] 2. The utility model adopts a split body pressing cap. During sealing, the end face seal can be rotated to tightly press and compact the internal sealing packing. After using for a period of time, when the sealing packing is consumed, the split sealing pressing cap can be further tightened to achieve a better sealing effect.

[0034] 3. The utility model designs the split surfaces of the sealing body and the pressing cap as dovetail convex blocks and dovetail grooves for fitting connection, which makes the installation more stable. An L-shaped sealing rubber strip is provided, and combined with the fastening bolts, the split sealing body has a good sealing effect during sealing.

[0035] 4. The utility model adds an injection device. When injecting the sealing packing, a handheld explosion-proof electric wrench or hydraulic injection can be used, which is more convenient. It can inject the sealing packing without shutting down the well, effectively reducing the labor intensity and improving the production efficiency.

[0036] 5. The utility model uses two fastening blocks to fasten around the packing box, and the size can be adjusted telescopically, which is suitable for packing box pressing caps of various sizes. Description of the Drawings

[0037] Figure 1 is a structural schematic diagram of an injection type split seal device for an oil well wellhead of the utility model Figure 1 ;

[0038] Figure 2 is a structural schematic diagram of an injection type split seal device for an oil well wellhead of the utility model Figure 2 ;

[0039] Figure 3 is a structural schematic diagram of the sealing body in the utility model;

[0040] Figure 4It is a schematic structural diagram of the fastening component in the present utility model;

[0041] Figure 5 It is a schematic structural diagram of the L-shaped sealing strip in the present utility model.

[0042] In the figure: 1. Body cap; 2. Cap cavity; 3. Cap dovetail groove; 4. External thread of cap; 5. Internal thread of body; 6. Cap sealing washer; 7. Body dovetail groove; 8. Injection hole; 9. First half-sealing body; 10. Fixing screw; 11. Sealing capsule cavity; 12. Second half-sealing body; 13. End face sealing ring; 14. Longitudinal bolt; 15. Fastening block; 16. Slip jaw tooth; 17. Transverse bolt; 18. Injection cylinder; 19. Injection cylinder cap; 20. Screw rod type injection pipe piston; 21. Sealing packing; 22. Longitudinal bolt adjustment hole; 23. Longitudinal bolt fixing hole; 24. L-shaped sealing strip. Specific embodiments

[0043] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments in the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the protection scope of the present utility model.

[0044] Embodiment 1:

[0045] Please refer to Figures 1 to 5 , an injection type split seal device for an oil well wellhead provided by the present utility model includes a sealing body. An upper end inner wall of the sealing body is provided with a body cap 1. The sealing body is of a split type, and the body cap 1 is of a split type. An injection assembly is arranged on a side wall of the sealing body, and the injection assembly is communicated with the inside of the sealing body. A fastening assembly is arranged at a lower end of the sealing body. By fixing the fastening assembly to a leakage cap or a pipe body of a leakage wellhead seal, the sealing body is attached to the upper end of the leakage cap to achieve sealing. The sealing effect is ensured by pressurizing the sealing packing 21 through the body cap 1 and the injection assembly.

[0046] An end cover is arranged on an outer wall of a lower end of the sealing body. A retaining ring is arranged on a lower end inner wall of the sealing body. An end face sealing ring 13 is arranged on a lower end face of the sealing body. The end cover is connected to the fastening assembly.

[0047] Among them, the retaining ring is used to limit the movement of the sealing packing 21.

[0048] Among them, the end face sealing ring 13 is used to seal with the upper end face of the leakage cap.

[0049] Specifically, the sealing body is circular tubular. The sealing body includes a first semi-sealing body 9 and a second semi-sealing body 12. A body dovetail convex block is arranged on the joint surface of the first semi-sealing body 9, and a body dovetail groove 7 is arranged on the joint surface of the second semi-sealing body 12. The body dovetail convex block is engaged with the body dovetail groove 7 to join the first semi-sealing body 9 and the second semi-sealing body 12 together. The first semi-sealing body 9 and the second semi-sealing body 12 are fastened by fixing screws 10, and are sealed by an L-shaped sealing strip 24 between the first semi-sealing body 9 and the second semi-sealing body 12.

[0050] Among them, two body dovetail convex blocks and two body dovetail grooves 7 are provided. Two fixing screws 10 penetrate through the same group of body dovetail convex block and body dovetail groove 7.

[0051] Among them, an internal thread 5 of the body is arranged at the upper end of the sealing body, and an external thread 4 of the cap is arranged at the lower end of the outer wall of the body cap 1. The internal thread 5 of the body is connected to the external thread 4 of the cap.

[0052] Specifically, the center of the body cap 1 is a cap cavity 2. A limiting ring is arranged on the outer wall at the upper end of the body cap 1, and a cap sealing washer 6 is arranged at the lower end of the body cap 1. The body cap 1 includes a first semi-cap and a second semi-cap. A cap dovetail groove 3 is arranged on the joint surface of the first semi-cap, and a cap dovetail convex block is arranged on the joint surface of the second semi-cap. The cap dovetail groove 3 and the cap dovetail convex block join the first semi-cap and the second semi-cap together.

[0053] Specifically, the fastening assembly includes two fastening blocks 15. A clamping groove is arranged on the fastening block 15, and a clamping jaw 16 is arranged in the clamping groove. A transverse locking bolt hole is arranged on the fastening block 15, and a longitudinal bolt fixing hole 23 is arranged on the fastening block 15. A longitudinal bolt adjusting hole 22 is arranged on the end cover. The transverse locking bolt holes of the two fastening blocks 15 are connected by a transverse bolt 17, and the longitudinal bolt fixing hole 23 and the longitudinal bolt adjusting hole 22 are connected by a longitudinal bolt 14.

[0054] Among them, the clamping groove is trapezoidal or V-shaped to realize positioning with the leakage cap.

[0055] Specifically, the injection assembly includes an injection cylinder 18, an injection cylinder cap 19, and a lead screw type injection tube piston 20. An injection hole 8 is arranged on the side wall of the sealing body. The injection cylinder 18 is fixedly connected to the injection hole 8. The injection cylinder cap 19 is arranged at the port of the injection cylinder 18. A threaded hole is arranged at the center of the injection cylinder cap 19. The lead screw type injection tube piston 20 includes a piston, a lead screw, and a tool handle connected in sequence. The lead screw is connected to the threaded hole of the injection cylinder cap 19, and the piston is located in the injection cylinder 18. The piston seals the injection cylinder.

[0056] Among them, the injection hole 8 is provided on the first semi-sealing body 9 or / and the second semi-sealing body 12. The injection holes 8 provided on both the first semi-sealing body 9 and the second semi-sealing body 12 can make the distribution density of the sealing filler 21 in the sealing capsule cavity 11 more uniform.

[0057] Embodiment 2:

[0058] Based on Embodiment 1, this embodiment provides a method for using an in-wellhead injection type split seal device, including the following steps:

[0059] First, fix the fastening block 15 on the gland where the original packing box leaks. Tighten the transverse bolt 17. Then, install the L-shaped sealing strip 24 on the mating surface of the first semi-sealing body 9 and the second semi-sealing body 12. Install the first semi-sealing body 9 and the second semi-sealing body 12 together through the dovetail block and the body dovetail groove 7. Pad the end face sealing ring 13 and place it on the leaking gland. Tighten the fixing screw 10 to fix the fastening block 15 and the sealing body on the packing box, and tighten the four longitudinal bolts 14.

[0060] Fit the first semi-gland and the second semi-gland together, install the gland sealing washer 6, press the body gland 1 and tighten it. Inject the sealing filler 21 into the sealing capsule cavity 11 of the sealing body through the injection hole 8 by the injection cylinder 18. The sealing filler 21 is selected from magneto-fluid injection type particles or a sealing grease of a mixture of particles, fibers, long glue, and grease. During injection, use a handheld explosion-proof electric wrench to hold the tool handle of the lead screw type injection pipe piston 20 and screw it in. The body gland 1 is screwed down tightly to compact the sealing filler 21.

[0061] In this application, the parts themselves that are not elaborated and the connection methods of the various parts in this application all belong to the well-known technologies in the technical field. They can be directly applied and will not be elaborated further.

[0062] In the present utility model, the term "a plurality of" refers to two or more, unless otherwise clearly defined. Terms such as "install", "connect", "join", "fix", etc. should be understood in a broad sense. For example, "connect" can be a fixed connection, a detachable connection, or an integral connection; "join" can be a direct connection or an indirect connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0063] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "front", "rear", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or unit referred to must have a specific direction, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model.

[0064] In the description of this specification, the descriptions of terms such as "one embodiment", "some embodiments", "specific embodiments", etc. mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or instance. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0065] The foregoing is only the preferred embodiment of the present utility model and is not intended to limit the present utility model. For those skilled in the art, the present utility model can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. An oil well head injection split sealing device, comprising a sealing body, wherein a body pressure cap is arranged at the upper end of the inner wall of the sealing body, characterized in that: The sealing body is split-open, and the body pressure cap is split-open; A fastening assembly is arranged at the lower end of the sealing body, and the fastening assembly can be fixed to the leakage pressure cap or the pipe body of the leakage wellhead sealer.

2. The oil well head injection type split sealing device according to claim 1, characterized in that: An end cover is arranged on the outer wall of the lower end of the sealing body, a retaining ring is arranged on the lower end of the inner wall of the sealing body, an end face sealing ring is arranged on the end face of the lower end of the sealing body, and the end cover is connected to the fastening assembly.

3. The oil well head injection type split sealing device according to claim 2, characterized in that: The sealing body is in a cylindrical shape and comprises a first half sealing body and a second half sealing body; The first half-sealed body is provided with a body protrusion on the joint surface, and the second half-sealed body is provided with a body groove on the joint surface. The body protrusion is engaged with the body groove to join the first half-sealed body and the second half-sealed body together. The first half sealed body and the second half sealed body are fastened by fixing screws, and the first half sealed body and the second half sealed body are sealed by a sealing strip.

4. The oil well head injection type split sealing device according to claim 3, characterized in that: A limiting ring is arranged on the outer wall of the upper end of the main body pressure cap, and a pressure cap sealing gasket is arranged on the lower end of the main body pressure cap; The main body pressing cap includes a first half pressing cap and a second half pressing cap. The splicing surface of the first half pressing cap is provided with a pressing cap groove, and the splicing surface of the second half pressing cap is provided with a pressing cap protrusion. The pressing cap groove and the pressing cap protrusion splice the first half pressing cap and the second half pressing cap together.

5. The oil well head injection type split sealing device according to claim 4, characterized in that: The main body protrusion is a main body dovetail protrusion, and the main body groove is a main body dovetail groove; the pressure cap protrusion is a pressure cap dovetail protrusion, and the pressure cap groove is a pressure cap dovetail groove.

6. The oil well head injection type split sealing device according to claim 4, characterized in that: The upper end of the sealing body is provided with a body internal thread, the lower end of the outer wall of the body pressure cap is provided with a pressure cap external thread, and the body internal thread is connected with the pressure cap external thread.

7. The oil well head injection type split sealing device according to claim 2, characterized in that: The fastening assembly includes two fastening blocks; The fastening block is provided with a clamping groove, a slip tooth is provided in the clamping groove, the fastening block is provided with a transverse locking bolt hole, and the fastening block is provided with a longitudinal bolt fixing hole; The end cover is provided with a longitudinal bolt adjustment hole; The transverse locking bolt holes of the two fastening blocks are connected by transverse bolts, and the longitudinal bolt fixing holes and the longitudinal bolt adjustment holes are connected by longitudinal bolts.

8. The oil well head injection type split sealing device according to claim 7, characterized in that: The clamping groove is trapezoidal or V-shaped.

9. The oil well head injection type split sealing device according to claim 3, characterized in that: The side wall of the sealing body is provided with an injection assembly, and the injection assembly is communicated with the interior of the sealing body; The injection assembly comprises an injection cylinder, an injection cylinder pressure cap, and a screw-type injection pipe piston; The side wall of the sealing body is provided with an injection hole, and the injection cylinder is fixedly connected to the injection hole; the injection cylinder pressure cap is arranged at the injection cylinder port, and a threaded hole is arranged at the center of the injection cylinder pressure cap; the screw-type injection tube piston comprises a piston, a screw, and a tool handle which are connected in sequence, the screw is connected to the threaded hole of the injection cylinder pressure cap, the piston is located in the injection cylinder, and the piston seals the injection cylinder.

10. The oil well head injection type split sealing device according to claim 9, characterized in that: The injection hole is arranged on the first semi-sealed body and / or the second semi-sealed body.

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