A grease injection valve for tubing head spools

Abstract

This utility model relates to the field of grease injection valve technology, specifically a grease injection valve for a four-way oil pipe head, comprising: a four-way oil pipe body and a grease injection valve connected to one side of the four-way oil pipe body, with a stabilizing mechanism provided on one side of the grease injection valve. The stabilizing mechanism includes a set of L-shaped brackets, the near ends of both L-shaped brackets being fixedly connected to the four-way oil pipe body, and the far ends of both L-shaped brackets being rotatably mounted with a set of relatively rotatable clamping rods via fixing pins. One end of the clamping rod is fixedly connected to a clamping block, and the other end of the clamping rod is connected to a driving component for driving the relative rotation of the clamping rods. The bidirectional self-locking clamping mechanism provides rigid full-circumferential constraint to the grease injection gun and the grease injection valve interface, dynamically maintaining their coaxial positioning throughout the high-pressure grease injection process. This design completely eliminates radial offset and axial movement caused by the recoil force of grease injection, fundamentally preventing the risk of grease splashing from the interface gap, and simultaneously avoiding injury to operators caused by reverse high-pressure grease injection.

Description

Technical Field

[0001] This utility model relates to the field of grease injection valve technology, specifically a grease injection valve for a four-way valve on an oil pipe head. Background Technology

[0002] The tubing head tee, as a core pressure-bearing component of the wellhead assembly, provides crucial support and fluid channels for the tubing suspension system. The lower part of the tubing head connects to the casing head, and the upper part connects to the gas production tree. The lower end of the tubing head body and the inner casing utilize a BT or TS sealing structure. When the BT sealing ring fails, a special sealing grease can be injected into the annular metal sealing interface between the tubing hanger and the body through a grease injection valve. Under high temperature and high pressure conditions, this dynamically compensates for the microscopic gaps in the main seal, forming a secondary plastic sealing barrier. This effectively seals potential leakage paths for sulfur-containing oil and gas media, serving as an active safety mechanism to ensure wellhead integrity.

[0003] In existing technologies, the current technical solutions require operators to vertically align the output end of a high-pressure grease gun with the grease nozzle at the top of the grease valve. By driving the piston mechanism inside the grease gun, pre-filled sealing grease is pressurized and output through the gun body. The grease flows through the internal channel of the grease valve and ultimately reaches the sealing annular area of ​​the tubing hanger. This process relies on the fluidity of the grease under high pressure to fill the sealing cavity, thereby enhancing the leak-stopping ability of the annular sealing interface.

[0004] However, after the high-pressure grease gun and nozzle are connected, the strong reaction force generated by the grease injection may cause axial misalignment or radial wobble between the gun and nozzle. This requires the operator to continuously apply external force to stabilize the connection to maintain the strict coaxiality of the grease injection channel. Insufficient connection stability not only affects the grease injection efficiency but also easily leads to high-pressure sealing grease splashing from the interface gap or reverse grease injection due to pressure fluctuations, posing a threat to the safety of the operator. Utility Model Content

[0005] The purpose of this invention is to provide a grease injection valve for a four-way valve for an oil pipe head, so as to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a grease injection valve for a four-way oil pipe head, comprising: a four-way oil pipe body and a grease injection valve installed in connection with one side of the four-way oil pipe body, wherein a stabilizing mechanism is provided on one side of the grease injection valve.

[0007] The stabilizing mechanism includes a set of L-shaped frames. The near ends of both L-shaped frames are fixedly connected to the body of the oil pipe four-way connector. The opposite ends of both L-shaped frames are rotatably mounted with a set of relatively rotatable clamping rods via fixing pins. One end of each clamping rod is fixedly connected to a clamping block, and the other end is connected to a drive assembly for driving the relative rotation of the clamping rods.

[0008] Preferably, the drive assembly includes a threaded rod, both ends of which are rotatably sleeved on one end of the support base, and the other end of the support base is fixedly connected to the L-shaped frame. The threaded rod has two threads at both ends with opposite directions of rotation, and a hand disc is fixedly sleeved in the middle of the threaded rod.

[0009] Preferably, the threaded rod is symmetrically threaded with movable blocks, one side of the movable blocks is fixedly connected to one end of the connecting rod, and a limit groove is opened on the other side of the threaded rod. The limit groove is slidably connected to the limit strip fixedly connected to the L-shaped frame.

[0010] Preferably, the other end of the connecting rod is fixedly connected to the middle of the connecting block, and both ends of the connecting block are rotatably connected to one end of the H-shaped frame through connecting pins.

[0011] Preferably, the other end of the H-shaped frame is rotatably connected to the end of the clamping rod away from the clamping block via a connecting pin.

[0012] Preferably, a limiting plate is provided on one side of the H-shaped frame, and the limiting plate is fixedly connected to the L-shaped frame by a fixing pin.

[0013] Compared with existing technologies, the advantages of this invention are: by using a bidirectional self-locking clamping mechanism to rigidly constrain the grease injection gun and grease injection valve interface in the entire circumferential direction, the coaxial positioning of the two is dynamically maintained throughout the high-pressure grease injection process. This design completely eliminates radial displacement and axial movement caused by the recoil force of grease injection, fundamentally preventing the risk of grease splashing from the interface gap, while also avoiding the risk of high-pressure grease flow back jetting and causing injury to operators, thus improving the inherent safety level of wellhead maintenance operations. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0015] Figure 2 This is a top view of the overall structure of this utility model;

[0016] Figure 3 This utility model Figure 1 Enlarged schematic diagram of the structure at point A in the middle;

[0017] Figure 4 This utility model Figure 2 Enlarged schematic diagram of the structure at point B.

[0018] In the diagram: 1. Oil pipe four-way body; 2. Grease injection valve; 3. L-shaped bracket; 4. Fixing pin; 5. Clamping rod; 6. Clamping block; 7. Threaded rod; 8. Support base; 9. Hand crank; 10. Moving block; 11. Connecting rod; 12. Limiting groove; 13. Limiting strip; 14. Connecting block; 15. Connecting pin; 16. H-shaped bracket; 17. Limiting plate. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of this utility model clear and complete, the embodiments of this utility model will be further described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only some, not all, embodiments of this utility model, and are merely used to explain the embodiments of this utility model. They are not intended to limit the embodiments of this utility model. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0020] Example 1: Please refer to Figures 1-4 This utility model provides a technical solution: a grease injection valve for a four-way oil pipe head, comprising: a four-way oil pipe body 1 and a grease injection valve 2 connected to one side of the four-way oil pipe body 1. A stabilizing mechanism is provided on one side of the grease injection valve 2 to ensure the stability of the oil nozzle on the grease injection valve 2 when it is connected to the high-pressure oil gun for oil injection. The stabilizing mechanism includes a set of L-shaped brackets 3. The near ends of the two L-shaped brackets 3 are fixedly connected to the four-way oil pipe body 1. The far ends of the two L-shaped brackets 3 are rotatably mounted with a set of relatively rotatable clamping rods 5 through fixing pins 4. The fixing pins 4 limit the clamping rods 5. A clamping block 6 is fixedly connected to one end of the clamping rod 5, and a driving component for driving the relative rotation of the clamping rod 5 is connected to the other end of the clamping rod 5.

[0021] When the BT sealing ring fails and needs to be sealed with grease, first, the high-pressure oil gun is vertically connected to the oil injection nozzle of the grease injection valve 2. In order to ensure the stability during the high-pressure grease injection process, the drive component drives a set of clamping rods 5 to rotate in opposite directions under the limit of the fixed pin 4, thereby driving the clamping blocks 6 to move in opposite directions until the two clamping blocks 6 are in contact with the outer ring surface of the high-pressure oil gun output end and the grease injection valve 2, and then clamp and fix them together, thereby further ensuring the stability during the grease injection process and avoiding the impact of unstable connection on the grease injection efficiency.

[0022] Example 2: Based on Example 1, the drive assembly includes a threaded rod 7. Both ends of the threaded rod 7 are rotatably sleeved on one end of a support base 8. The support base 8 limits the rotation of the threaded rod 7, thereby ensuring its rotational stability. The other end of the support base 8 is fixedly connected to an L-shaped frame 3. The threaded rod 7 has two threads at both ends with opposite directions of rotation. A handwheel 9 is fixedly sleeved in the middle of the threaded rod 7, so that the threaded rod 7 can be rotated by turning the handwheel 9. A movable block 10 is symmetrically threaded on the threaded rod 7. One side of the movable block 10 is fixedly connected to one end of a connecting rod 11. A limit groove 12 is opened on the other side of the threaded rod 7. The limit groove 12 is connected to the L-shaped frame. The limiting strip 13, which is fixedly connected to the upper part of the L-shaped frame 3, is slidably connected. The limiting strip 13 limits the limiting groove 12, thereby ensuring the sliding stability of the moving block 10. The other end of the connecting rod 11 is fixedly connected to the middle of the connecting block 14. Both ends of the connecting block 14 are rotatably connected to one end of the H-shaped frame 16 through the connecting pin 15. The other end of the H-shaped frame 16 is rotatably connected to the end of the clamping rod 5 away from the clamping block 6 through the connecting pin 15. A limiting plate 17 is provided on one side of the H-shaped frame 16. The limiting plate 17 is fixedly connected to the L-shaped frame 3 through the fixing pin 4. The limiting plate 17 is slidably connected to the clamping rod 5, thereby limiting the clamping rod 5 through the limiting plate 17.

[0023] When further stabilization of the grease injection valve 2 and the high-pressure grease gun is required after docking, the hand disc 9, which is fixedly sleeved in the middle of the threaded rod 7, is turned. The hand disc 9 drives the threaded rod 7 to rotate under the limit of the support seat 8. Since the two sides of the threaded rod 7 are threadedly sleeved with the moving block 10, the moving block 10 can be driven to move. The moving block 10 slides under the cooperation of the limiting groove 12 and the limiting strip 13, which in turn drives the connecting rod 11 to move. The connecting rod 11 then drives the connecting block 14 to move synchronously. Under the connection of the connecting pins 15, the two ends of the H-shaped frame 16 are pushed to rotate. Under the connection of the connecting pins 15, the H-shaped frame 16 drives the end of the clamping rod 5 away from the clamping block 6 to move in the opposite direction. The end of the clamping rod 5 close to the clamping block 6 moves towards each other under the limitation of the fixing pin 4 and the limiting plate 17. Then, the clamping block 6 fixes the output end of the high-pressure oil gun and the grease injection valve 2, thus ensuring the stability of their docking and preventing high-pressure sealing grease from splashing from the interface gap or injuring the operator.

[0024] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A grease injection valve for a four-way oil pipe fitting, comprising a four-way oil pipe fitting body (1) and a grease injection valve (2) connected to one side of the four-way oil pipe fitting body (1), characterized in that: A stabilizing mechanism is provided on one side of the grease injection valve (2); The stabilizing mechanism includes a set of L-shaped frames (3). The near ends of the two L-shaped frames (3) are fixedly connected to the body (1) of the oil pipe four-way connector. The opposite ends of the two L-shaped frames (3) are rotatably mounted with a set of relatively rotatable clamping rods (5) through fixing pins (4). One end of the clamping rod (5) is fixedly connected to a clamping block (6), and the other end of the clamping rod (5) is connected to a driving assembly for driving the relative rotation of the clamping rod (5). The driving assembly includes a threaded rod (7), and both ends of the threaded rod (7) are rotatably sleeved on the support. One end of the seat (8) and the other end of the support seat (8) are fixedly connected to the L-shaped frame (3). The threaded rod (7) has two threads at both ends with opposite directions of rotation. A hand plate (9) is fixedly sleeved in the middle of the threaded rod (7). A moving block (10) is symmetrically threaded on the threaded rod (7). One side of the moving block (10) is fixedly connected to one end of the connecting rod (11). A limit groove (12) is opened on the other side of the threaded rod (7). The limit groove (12) is slidably connected to the limit strip (13) fixedly connected to the L-shaped frame (3).

2. The grease injection valve for a four-way oil pipe head according to claim 1, characterized in that: The other end of the connecting rod (11) is fixedly connected to the middle of the connecting block (14), and both ends of the connecting block (14) are rotatably connected to one end of the H-shaped frame (16) through connecting pins (15).

3. A grease injection valve for a four-way oil pipe head according to claim 2, characterized in that: The other end of the H-shaped frame (16) is rotatably connected to the end of the clamping rod (5) away from the clamping block (6) via a connecting pin (15).

4. A grease injection valve for a four-way oil pipe head according to claim 3, characterized in that: A limiting plate (17) is provided on one side of the H-shaped frame (16), and the limiting plate (17) is fixedly connected to the L-shaped frame (3) by a fixing pin (4).

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