A high-performance expandable tailpipe hanger for cementing operations

Abstract

This utility model relates to the technical field of tailpipe hangers, and discloses a high-performance expandable tailpipe hanger for cementing operations. It includes two connecting pipes, with an expansion pipe connected to one adjacent end of each pipe. A fixed frame is provided at the front end of the upper connecting pipe, and a protective plate is fixedly connected to the middle of the fixed frame. Baffles are provided at the upper and lower ends of the inner wall of the protective plate. A bidirectional screw is rotatably connected to the upper and lower parts of one side of the front end of the inner wall of the fixed frame. In this utility model, rotating the toothed ring drives the bidirectional screw to rotate. When the bidirectional screw rotates, the connecting block fixed to it drives the slider on the baffle to slide within the groove on the inner wall of the protective plate, causing the two baffles, which were originally in contact, to open smoothly. After the baffles open, lubricating fluid can be directly added, allowing the lubricating fluid to be quickly injected through the channel directly connecting the fixed frame and the lubrication chamber, shortening the lubrication operation time.

Description

Technical Field

[0001] This utility model relates to the field of tailpipe hanger technology, and in particular to a high-performance expandable tailpipe hanger for cementing operations. Background Technology

[0002] In cementing operations for oil and gas extraction, the tailpipe hanger, as a core tool connecting the upper casing and the lower tailpipe, directly affects the reliability of wellbore support and interlayer sealing. High-performance expandable tailpipe hangers for cementing are downhole tools based on expandable tubing technology. Their core function is to securely suspend the tailpipe to the inner wall of the upper casing through expansion and deformation, while simultaneously achieving annular sealing. However, most tailpipe hangers require disassembly when adding lubricating fluid. This often involves removing connecting components or internal protective structures, requiring various tools to remove bolts and baffles, and navigating cumbersome steps to locate the lubrication point. The operation is extremely troublesome, and the disassembly process can easily damage the equipment's sealing structure.

[0003] Therefore, those skilled in the art have provided a high-performance expandable tailpipe hanger for cementing operations to solve the problems mentioned in the background art. Utility Model Content

[0004] The purpose of this utility model is to overcome the shortcomings of the existing technology and provide a high-performance expandable tailpipe hanger for cementing construction. When the sliding door is opened, the toothed ring is rotated with the help of a tool to drive the bidirectional screw to rotate. When the bidirectional screw rotates, the connecting block fixed on it drives the slider on the baffle to slide in the groove on the inner wall of the protective plate, so that the two baffles that were originally in contact with each other can be opened smoothly. After the baffles are opened, lubricating fluid can be added directly.

[0005] To achieve the above objectives, this utility model provides the following technical solution;

[0006] A high-performance expandable tailpipe hanger for cementing operations includes two connecting pipes, with an expansion pipe connected to one adjacent end of each connecting pipe. A fixing frame is provided at the front end of the upper connecting pipe, and a protective plate is fixedly connected to the middle of the fixing frame. Baffles are provided at the upper and lower ends of the inner wall of the protective plate. A bidirectional screw is rotatably connected to the upper and lower parts of one side of the front end of the inner wall of the fixing frame. Connecting blocks are threaded at the upper and lower ends of the shaft of the bidirectional screw near the middle. The rear ends of the two connecting blocks are fixedly connected to the outer wall of the corresponding baffle.

[0007] Through the above technical solution, the combination of the fixed frame and the protective plate forms a protective cavity. The baffle can be opened and closed under the bidirectional screw drive, which can not only prevent debris in the well from entering the lubrication cavity, but also quickly open the channel when needed, providing an operational basis for lubrication maintenance.

[0008] Furthermore, a toothed ring is fixedly connected to the upper part of the bidirectional screw shaft, and sliders are fixedly connected to both sides of the two baffles near the center of the protective plate. A fixing block is fixedly connected to one side of the front end of the two protective plates, and the inner wall of the fixing block is rotatably connected to the outer wall of the bidirectional screw.

[0009] Through the above technical solution, the toothed ring allows external tools to directly drive the bidirectional screw to rotate, which is convenient to operate. The cooperation between the slider and the protective plate groove ensures that the baffle slides smoothly under the drive of the bidirectional screw, while the support of the fixed block for the bidirectional screw enhances the reliability of the transmission structure.

[0010] Furthermore, multiple sealing rings are provided at the connection points between the upper and lower ends of the expansion tube and the corresponding connecting tubes, and the sealing rings limit the connection points between the expansion tube and the corresponding connecting tubes;

[0011] Through the above technical solution, the sealing protection ring fills the interface gap between the expansion tube and the connecting tube through elastic deformation, forming multiple sealing barriers. At the same time, the limiting function ensures that the expansion tube is stable in position when subjected to axial force, avoiding the impact of displacement on the expansion mounting accuracy.

[0012] Furthermore, the upper end of the connecting pipe is connected to an inlet, and the rear end of the fixing frame is connected to the internal lubrication cavity;

[0013] The above technical solution, with its through-flow design between the inlet and the lubrication chamber, allows lubricant to be injected directly from the ground through the construction pipe column without the need for additional pipeline transfers. The through-flow channel shortens the lubrication path, reduces liquid loss, ensures that the lubricant reaches the lubrication point quickly, and improves maintenance efficiency.

[0014] Furthermore, both sides of the inner wall of the protective plate are provided with sliding grooves, and the inner walls of the sliding grooves are slidably connected to the outer wall of the slider.

[0015] Through the above technical solution, the slide provides guidance for the slider, so that the baffle maintains linear motion during the opening and closing process. This structure ensures that the baffle fits tightly with the protective plate when closed, improving the sealing reliability, while reducing operating resistance and making the screw drive smoother.

[0016] Furthermore, a sliding door is slidably provided on the other side of the front end of the inner wall of the fixed frame, and connecting grooves are provided at the upper and lower parts of the front end of the inner wall of the fixed frame, and the inner walls of the connecting grooves are slidably connected to the end of the sliding door corresponding to the sliding door.

[0017] Through the above technical solution, the sliding door achieves sliding opening and closing through the connecting groove, and the toothed ring and other operating components inside the fixed frame are visible, providing a convenient passage for lubrication and maintenance. When closed, the sliding door and the fixed frame form a sealed structure, which together with the baffle constitutes double protection.

[0018] This utility model has the following beneficial effects:

[0019] This utility model proposes a high-performance expandable tailpipe hanger for cementing operations. When lubricating fluid needs to be added, simply slide open the sliding door, and use a tool to rotate the toothed ring to drive the bidirectional screw to rotate. When the bidirectional screw rotates, the connecting block fixed on it drives the slider on the baffle to slide in the groove on the inner wall of the protective plate, so that the two baffles that were originally in contact with each other can be opened smoothly. After the baffles are opened, lubricating fluid can be added directly, allowing the lubricating fluid to be injected quickly through the channel that directly connects the fixed frame and the lubrication chamber, shortening the lubrication operation time and improving performance. Attached Figure Description

[0020] Figure 1 This is an isometric view of a high-performance expandable tailpipe hanger for cementing operations proposed in this utility model;

[0021] Figure 2 This is a schematic diagram of the main structure of a high-performance expandable tailpipe hanger for cementing construction proposed in this utility model;

[0022] Figure 3 for Figure 2 Enlarged view of point A in the middle;

[0023] Figure 4 This is a partial exploded view of the structure of a high-performance expandable tailpipe hanger for cementing operations proposed in this utility model.

[0024] Figure 5 This is a partial structural schematic diagram of a high-performance expandable tailpipe hanger for cementing operations proposed in this utility model.

[0025] Explanation of reference numerals in the attached figures:

[0026] 1. Connecting pipe;

[0027] 2. Fixed frame; 21. Sliding door; 22. Protective plate; 23. Baffle; 24. Two-way screw; 25. Toothed ring; 26. Fixing block; 27. Slider;

[0028] 3. Sealing protection ring; 4. Expansion tube; 5. Inlet. Detailed Implementation

[0029] The technical solutions of the present invention will now be clearly and completely described in conjunction with the accompanying drawings of the specific embodiments.

[0030] Reference Figure 1-5 This utility model provides a specific implementation method:

[0031] A high-performance expandable tailpipe hanger for cementing operations includes two connecting pipes 1, with an expansion pipe 4 connected to one adjacent end of each connecting pipe 1. A fixed frame 2 is provided at the front end of the upper connecting pipe 1, and a protective plate 22 is fixedly connected to the middle of the fixed frame 2. Baffles 23 are provided at the upper and lower ends of the inner wall of the protective plate 22. A bidirectional screw 24 is rotatably connected to the upper and lower parts of one side of the front end of the inner wall of the fixed frame 2. Connecting blocks are threaded at the upper and lower ends of the shaft of the bidirectional screw 24 near the middle. The rear ends of the two connecting blocks are fixedly connected to the outer wall of the corresponding baffles 23. The combination of the fixed frame 2 and the protective plate 22 forms a protective cavity. The baffles 23 can be opened and closed under the drive of the bidirectional screw 24, which can prevent debris in the well from entering the lubrication cavity and can also quickly open the channel when needed, providing an operational basis for lubrication maintenance.

[0032] A toothed ring 25 is fixedly connected to the upper part of the bidirectional screw 24. Slider 27s are fixedly connected to both sides of the two baffles 23 near the center of the protective plate 22. Fixing blocks 26s are fixedly connected to one side of the front end of the two protective plates 22. The inner wall of the fixing block 26 is rotatably connected to the outer wall of the bidirectional screw 24. The toothed ring 25 allows external tools to directly drive the bidirectional screw 24 to rotate, making operation convenient. The cooperation between the slider 27 and the groove of the protective plate 22 ensures that the baffle 23 slides smoothly under the drive of the bidirectional screw 24. The support of the fixing block 26 for the bidirectional screw 24 enhances the reliability of the transmission structure.

[0033] Multiple sealing rings 3 are provided at the connection points between the upper and lower ends of the expansion tube 4 and the corresponding connecting tube 1. The sealing rings 3 limit the connection points between the expansion tube 4 and the corresponding connecting tube 1. The sealing rings 3 fill the interface gap between the expansion tube 4 and the connecting tube 1 through elastic deformation, forming multiple sealing barriers. At the same time, the limiting function ensures that the expansion tube 4 is stable in position when subjected to axial force, avoiding the impact of displacement on the expansion mounting accuracy. The upper end of the upper connecting tube 1 is connected to the inlet 5. The rear end of the fixing frame 2 is connected to the internal lubrication cavity. The connection design between the inlet 5 and the lubrication cavity allows the lubricant to be injected directly from the ground through the construction pipe column without the need for additional pipeline transfer. The through channel shortens the lubrication path, reduces liquid loss, ensures that the lubricant quickly reaches the lubrication point, and improves maintenance efficiency.

[0034] Both sides of the inner wall of the protective plate 22 are provided with sliding grooves. The inner walls of the sliding grooves are slidably connected to the outer wall of the slider 27. The sliding grooves provide guidance for the slider 27, so that the baffle 23 maintains linear movement during opening and closing. This structure ensures that the baffle 23 fits tightly with the protective plate 22 when closed, improving sealing reliability and reducing operating resistance, making the screw drive smoother. A sliding door 21 is slidably provided on the other side of the inner wall of the fixed frame 2. The upper and lower parts of the inner wall of the fixed frame 2 are provided with connecting grooves. The inner walls of the connecting grooves are slidably connected to the corresponding end of the sliding door 21. The sliding door 21 achieves sliding opening and closing through the connecting grooves, allowing the operation components such as the toothed ring 25 inside the fixed frame 2 to be visible, providing a convenient channel for lubrication and maintenance. When closed, the sliding door 21 and the fixed frame 2 form a sealed structure, which together with the baffle 23 constitutes double protection.

[0035] Working principle: When the hanger is working, the connecting pipe 1 is first assembled with the construction pipe string and tail pipe, and then lowered into the well along with the expansion pipe 4. At this time, the baffle 23 in the fixed frame 2 is kept closed under the linkage of the slider 27 and the bidirectional screw 24, effectively preventing the intrusion of debris in the well. At the same time, the sealing protection ring 3 at the connection between the connecting pipe 1 and the expansion pipe 4 plays a role in enhancing the overall sealing performance of the hanger. When lubrication maintenance is required, simply slide open the sliding door 21, and rotate the toothed ring 25 with the help of a tool to drive the bidirectional screw 24 to rotate synchronously. During the rotation of the screw, the slider 27 on the baffle 23 is driven by the connecting block to slide smoothly in the groove of the protective plate 22, so that the originally tightly fitted baffle 23 gradually opens to form a through channel. The lubricant can be quickly injected through the connection path between the fixed frame 2 and the lubrication chamber. After the lubrication is completed, rotate the toothed ring 25 in the opposite direction to close the baffle 23 again, and then close the sliding door 21. The whole process does not require disassembly of the core components, making the operation convenient.

[0036] The following points should be noted in this article:

[0037] 1. The accompanying drawings of the embodiments disclosed herein only relate to the structures involved in the embodiments disclosed herein; other structures can be referred to in general design.

[0038] 2. Where there is no conflict, the embodiments of this disclosure and the features in the embodiments can be combined with each other to obtain new embodiments.

[0039] 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 specific embodiments, those skilled in the art can still modify the technical solutions described in the foregoing specific 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 high performance expandable liner hanger for cementing operations, comprising two connecting pipes (1), characterized in that: Two connecting pipes (1) are connected to an expansion pipe (4) at one end. A fixed frame (2) is provided at the front end of the upper connecting pipe (1). A protective plate (22) is fixedly connected to the middle of the fixed frame (2). A baffle (23) is provided at the upper and lower ends of the inner wall of the protective plate (22). A bidirectional screw (24) is rotatably connected to the upper and lower parts of the front end side of the inner wall of the fixed frame (2). A connecting block is threaded at the upper and lower ends of the rod body of the bidirectional screw (24) near the middle. The rear ends of the two connecting blocks are fixedly connected to the outer wall of the corresponding baffle (23).

2. A high performance expandable liner hanger for use in cementing operations according to claim 1, characterized in that: A toothed ring (25) is fixedly connected to the upper part of the bidirectional screw (24). Slider (27) is fixedly connected to both sides of one end of the two baffles (23) near the center of the protective plate (22). A fixing block (26) is fixedly connected to one side of the front end of the two protective plates (22). The inner wall of the fixing block (26) is rotatably connected to the outer wall of the bidirectional screw (24).

3. A high performance expandable liner hanger for use in cementing operations as defined in claim 1, wherein: Multiple sealing rings (3) are provided at the connection points between the upper and lower ends of the expansion tube (4) and the corresponding connecting tube (1), and the sealing rings (3) limit the connection points between the expansion tube (4) and the corresponding connecting tube (1).

4. A high performance expandable liner hanger for use in cementing operations according to claim 1, characterized in that: The upper end of the connecting pipe (1) is connected to the inlet (5), and the rear end of the fixed frame (2) is connected to the internal lubrication cavity.

5. A high performance expandable liner hanger for use in cementing operations according to claim 1, characterized in that: The inner walls of the protective plate (22) are provided with sliding grooves on both sides, and the inner walls of the sliding grooves are slidably connected to the outer walls of the slider (27).

6. A high performance expandable liner hanger for use in cementing operations according to claim 1, characterized in that: A sliding door (21) is slidably provided on the other side of the inner wall of the fixed frame (2). A connecting groove is provided at the upper and lower parts of the inner wall of the fixed frame (2). The inner wall of the connecting groove is slidably connected to one end of the sliding door (21).

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