Tailpipe hanger

Abstract

The application provides a tail pipe hanger and relates to the technical field of oil field equipment. The tail pipe hanger comprises a pipe head, the bottom end of the pipe head is rotationally connected with a locking pipe, the bottom end of the locking pipe is fixedly connected with a connecting pipe, the bottom end of the connecting pipe is fixedly connected with a pipe seat, the middle part of the outer wall of the connecting pipe is fixedly connected with a buffer sleeve, the inside of the connecting pipe is installed with a tail pipe body, the bottom end inner wall edge of the buffer sleeve is fixedly connected with a plurality of buffers, and the top end of the buffer is fixedly connected with a pressure rod. The taper sleeve is embedded in the aperture of the buffer, the impact generated can drive the pressure rod to move downward and act on the buffer, the damage caused by the weakened impact force to the hanger can be weakened through the buffer, the extrusion sleeve can extrude the rubber block, the rubber block is subjected to pressure and adheres to the extrusion groove, the buffering effect of tail pipe lowering is further achieved, and the service life of the tail pipe hanger is improved.

Description

Technical Field

[0001] This invention relates to the field of oilfield equipment technology, specifically to tailpipe hangers. Background Technology

[0002] A tailpipe hanger is a downhole tool that suspends the tailpipe from the upper casing string. Using a tailpipe hanger enables tailpipe cementing, reducing the weight of casing run into deep wells, improving the load on the drilling rig's hoisting system during casing run-in, reducing the flow resistance of the cement slurry, and facilitating safer operations. Furthermore, tailpipe reconnection can resolve drilling operations affected by upper casing wear. Additionally, tailpipe suspension cementing technology can reduce casing usage and save drilling costs.

[0003] In existing technologies, when suspending the tailpipe, there is a large impact force between the tailpipe and the tailpipe hanger during the drilling process. The tailpipe position is then restricted by slips and the weight of the tailpipe is distributed to the tailpipe hanger for support. Long-term use can easily cause deformation or damage to the tailpipe hanger structure. Furthermore, the vibration caused by the impact of oil or mud may cause the tailpipe to sway inside the hanger, resulting in low stability. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a tailpipe hanger, which solves the problem of low hanger life caused by high impact force during tailpipe suspension in existing technologies.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a tailpipe hanger, comprising a pipe head, a locking tube rotatably connected to the bottom end of the pipe head, a connecting tube fixedly connected to the bottom end of the locking tube, a pipe seat fixedly connected to the bottom end of the connecting tube, a buffer sleeve fixedly connected to the middle of the outer wall of the connecting tube, a tailpipe body installed inside the connecting tube, several buffers fixedly connected to the inner edge of the bottom end of the buffer sleeve, a pressure rod fixedly connected to the top of each buffer, a buffer element fixedly connected to the inner end of the pressure rod through the connecting tube, a movable groove provided on the inner wall of the connecting tube corresponding to the position of the pressure rod, a limiting sleeve fixedly connected to the inner wall of the connecting tube below the buffer element, the bottom end of the buffer element and the top end of the limiting sleeve being set as inclined surfaces, and a conical sleeve fixedly connected to the outer wall of the tailpipe body above the buffer element.

[0006] Preferably, each pressure rod is fixedly connected to a stabilizing rod at its bottom end, and each connecting tube has a stabilizing groove at the position corresponding to the stabilizing rod. The outer wall of the stabilizing rod is slidably connected to the inner wall of the stabilizing groove.

[0007] Preferably, the aperture of the buffer is larger than the bottom outer diameter of the buffer, and the aperture of the buffer is smaller than the top aperture of the buffer.

[0008] Preferably, connecting rods are fixedly connected to both sides of the bottom end of the tube head, and an arc-shaped through groove is provided at the top end of the locking tube corresponding to the position of the connecting rod. Receiving grooves are provided on both sides of the inner wall of the locking tube, and a locking block is rotatably connected to one side of the inner wall of the receiving groove.

[0009] Preferably, each locking block has an arc-shaped groove at its top, and the bottom of each connecting rod is located inside the corresponding arc-shaped groove. A locking ring is fixedly connected to the outer wall of the tail tube body above the locking block, and locking grooves are provided on both sides of the locking ring.

[0010] Preferably, a fixing rod is fixedly connected to both sides of the tube head, a limit plate is fixedly connected to one outer end of the fixing rod, a C-shaped handle is slidably connected to the outer wall of the fixing rod, a spring is installed in the cavity of the C-shaped handle on the outer side of the fixing rod, and two insertion holes are provided on both sides of the outer wall of the locking tube corresponding to the bottom of the insertion hole.

[0011] Preferably, a compression sleeve is fixedly connected to the top of the inner wall of the connecting pipe, a compression groove is provided on the inner wall of the connecting pipe corresponding to the top position of the compression sleeve, and a number of rubber blocks are fixedly connected to the outer wall of the tail pipe body above the compression groove.

[0012] Preferably, the top end of the extrusion sleeve is wedge-shaped, and the bottom end of each rubber block is provided with an inclined groove, the shape of which is adapted to the outer wall shape of the rubber block.

[0013] Working principle: During the lowering of the tailpipe, the conical sleeve first embeds into the aperture of the buffer component. The resulting impact drives the pressure rod downward and acts on the buffer. The buffer reduces the damage to the suspension caused by the impact. When the bottom of the buffer component contacts the upper surface of the limiting sleeve, it is limited. At this time, the locking ring moves to the position of the locking block. By pulling the C-shaped handle outward and rotating the tube head, the connecting rod rotates. The movement of the connecting rod in the arc groove of the locking block causes the locking block to deflect in the receiving groove. The locking block is locked into the locking groove of the locking ring. Then, the spring drives the C-shaped handle to be inserted into the insertion hole for fixation. This locks the tailpipe, restricts its deflection and sway, and improves the stability of the tailpipe installation. At the same time, the extrusion sleeve can compress the rubber block, causing the rubber block to be pressurized and adhered to the extrusion groove, further buffering the lowering of the tailpipe. A buffer layer is also formed between the tailpipe and the suspension, reducing mechanical wear between the tailpipe and the suspension.

[0014] This invention provides a tailpipe hanger. It has the following beneficial effects:

[0015] This invention uses a conical sleeve embedded in the aperture of the buffer component. The resulting impact can drive the pressure rod to move downward and act on the buffer. The buffer can reduce the damage to the suspension caused by the impact force. At the same time, the extrusion sleeve can compress the rubber block, so that the rubber block is subjected to pressure and adheres to the extrusion groove, which further plays a buffering role in the lowering of the tailpipe. At the same time, a buffer layer is formed between the tailpipe and the suspension, reducing the mechanical wear of the tailpipe and the suspension and improving the service life of the tailpipe suspension.

[0016] This invention allows the connecting rod to rotate by pulling the C-shaped handle outward and rotating the tube head. The movement of the connecting rod within the arc-shaped groove of the locking block causes the locking block to deflect within the receiving groove. The locking block then engages with the locking groove of the locking ring. Finally, a spring drives the C-shaped handle to be inserted into the insertion hole for fixation. This method locks the tail tube, restricts its deflection and swaying, and improves the stability of the tail tube installation. Attached Figure Description

[0017] Figure 1 This is a cross-sectional view of the present invention;

[0018] Figure 2 This is a perspective view of the present invention;

[0019] Figure 3 for Figure 1 Enlarged view of point A in the middle;

[0020] Figure 4 for Figure 1 Enlarged view at point B in the middle;

[0021] Figure 5 This is a schematic diagram of the locking tube structure of the present invention;

[0022] Figure 6 This is a schematic diagram of the pipe head structure of the present invention;

[0023] Figure 7 This is a schematic diagram of the fixing rod structure of the present invention;

[0024] Figure 8 This is a schematic diagram of the buffer structure of the present invention;

[0025] Figure 9 This is a schematic diagram of the locking ring structure of the present invention;

[0026] Figure 10 This is a schematic diagram of the locking block structure of the present invention;

[0027] Figure 11 This is a schematic diagram of the extrusion sleeve structure of the present invention.

[0028] The components are as follows: 1. Pipe head; 2. Buffer sleeve; 3. Buffer; 4. Buffer component; 5. Stabilizing groove; 6. Limiting sleeve; 7. Tail tube body; 8. Pipe seat; 9. Locking tube; 10. Connecting tube; 11. Conical sleeve; 12. C-shaped handle; 13. Extrusion sleeve; 14. Extrusion groove; 15. Rubber block; 16. Inclined groove; 17. Locking block; 18. Locking ring; 19. Connecting rod; 20. Receiving groove; 21. Spring; 22. Fixing rod; 23. Limiting plate; 24. Pressure rod; 25. Stabilizing rod; 26. Locking groove; 27. Arc groove; 28. Arc through groove; 29. ​​Insertion hole. Detailed Implementation

[0029] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] Example:

[0031] like Figure 1-11 As shown, this embodiment of the invention provides a tailpipe hanger, including a pipe head 1. A locking pipe 9 is rotatably connected to the bottom end of the pipe head 1. A connecting pipe 10 is fixedly connected to the bottom end of the locking pipe 9. A pipe seat 8 is fixedly connected to the bottom end of the connecting pipe 10. A buffer sleeve 2 is fixedly connected to the middle of the outer wall of the connecting pipe 10. A tailpipe body 7 is installed inside the connecting pipe 10. Several buffers 3 are fixedly connected to the inner edge of the bottom end of the buffer sleeve 2. A pressure rod 24 is fixedly connected to the top of each buffer 3. One end of the pressure rod 24 passes through the connecting pipe 10 and is fixedly connected to a buffer element 4. A movable groove is provided on the inner wall of the connecting pipe 10 at the position corresponding to the pressure rod 24. A fixed groove is provided on the inner wall of the connecting pipe 10 below the buffer element 4. The limit sleeve 6 is provided, and the bottom end of the buffer 4 and the top end of the limit sleeve 6 are set as inclined surfaces. The outer wall of the tail tube body 7 is fixedly connected to the upper part of the buffer 4. During the lowering process of the tail tube, the tapered sleeve 11 is first inserted into the hole of the buffer 4 through the tapered sleeve 11. The resulting impact can drive the pressure rod 24 to move downward and act on the buffer 3. The buffer 3 can reduce the damage caused by the impact force to the suspension. When the bottom of the buffer 4 contacts the upper surface of the limit sleeve 6, it is limited. The inclined surfaces of the bottom end of the buffer 4 and the top end of the limit sleeve 6 can increase the contact area between the two and reduce the pressure. At the same time, it can avoid the problem of tail tube misalignment caused by the accumulation of impurities on the surface of the limit sleeve 6.

[0032] The bottom end of each pressure rod 24 is fixedly connected to a stabilizing rod 25. The inner wall of the connecting pipe 10 is provided with a stabilizing groove 5 at the position corresponding to the stabilizing rod 25. The outer wall of the stabilizing rod 25 is slidably connected to the inner wall of the stabilizing groove 5. The movement of the stabilizing rod 25 in the stabilizing groove 5 can improve the structural strength and stability of the pressure rod 24.

[0033] The aperture of the buffer 4 is larger than the bottom outer diameter of the buffer 4, and the aperture of the buffer 4 is smaller than the top aperture of the buffer 4. This can prevent the suspension structure from directly contacting the buffer 4 and causing a large impact that would affect the strength of the buffer 4.

[0034] Connecting rods 19 are fixedly connected to both sides of the bottom end of the tube head 1. An arc-shaped through groove 28 is provided at the top of the locking tube 9 corresponding to the position of the connecting rod 19. Receiving grooves 20 are provided on both sides of the inner wall of the locking tube 9. A locking block 17 is rotatably connected to one side of the inner wall of the receiving groove 20.

[0035] The top of each locking block 17 is provided with an arc-shaped groove 27, and the bottom of the connecting rod 19 is respectively located inside the corresponding arc-shaped groove 27. The outer wall of the tail tube body 7 is fixedly connected to the locking block 17 above the locking ring 18, and locking grooves 26 are provided on both sides of the locking ring 18.

[0036] Both sides of the tube head 1 are fixedly connected to a fixing rod 22. The outer end of the fixing rod 22 is fixedly connected to a limit plate 23. The outer wall of the fixing rod 22 is slidably connected to a C-shaped handle 12. The outer side of the fixing rod 22 is installed in the cavity corresponding to the C-shaped handle 12. The outer wall of the locking tube 9 is provided with two insertion holes 29 at the bottom of the insertion holes 29. By pulling the C-shaped handle 12 outward, the tube head 1 is pulled out from one set of insertion holes 29. Then, the tube head 1 is rotated to make the connecting rod 19 rotate. The movement of the connecting rod 19 in the arc groove 27 of the locking block 17 can drive the locking block 17 to deflect in the receiving groove 20. The locking block 17 is inserted into the locking groove 26 of the locking ring 18. Then, the spring 21 drives the C-shaped handle 12 to be inserted into the other set of insertion holes 29 for fixation. This can lock the tail tube, limit the deflection and shaking of the tail tube, and improve the stability of the tail tube installation.

[0037] A compression sleeve 13 is fixedly connected to the top of the inner wall of the connecting pipe 10. A compression groove 14 is provided on the inner wall of the connecting pipe 10 at the top position of the compression sleeve 13. Several rubber blocks 15 are fixedly connected to the outer wall of the tail pipe body 7 above the compression groove 14.

[0038] The top of the extrusion sleeve 13 is wedge-shaped, and the bottom of the rubber block 15 is provided with inclined grooves 16. The shape of the extrusion groove 14 is adapted to the outer wall shape of the rubber block 15. The extrusion sleeve 13 can extrude the inclined grooves 16 of the rubber block 15, so that the rubber block 15 is subjected to pressure and fits into the extrusion groove 14, further playing a buffering effect when the tail tube is lowered. At the same time, a buffer layer is formed between the tail tube and the suspension to reduce the mechanical wear of the tail tube and the suspension.

[0039] Although embodiments of the 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 invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A tailpipe hanger, including a pipe head (1), characterized in that: The bottom end of the pipe head (1) is rotatably connected to a locking tube (9), the bottom end of the locking tube (9) is fixedly connected to a connecting tube (10), the bottom end of the connecting tube (10) is fixedly connected to a pipe seat (8), a buffer sleeve (2) is fixedly connected to the middle of the outer wall of the connecting tube (10), the tail tube body (7) is installed inside the connecting tube (10), several buffers (3) are fixedly connected to the inner edge of the bottom end of the buffer sleeve (2), and a pressure rod (24) is fixedly connected to the top of each buffer (3). One end of the inner side of the tube is connected to the connecting pipe (10) and a buffer (4) is fixedly connected thereto. The inner wall of the connecting pipe (10) is provided with a movable groove at the position corresponding to the pressure rod (24). The inner wall of the connecting pipe (10) is fixedly connected to the lower part of the buffer (4) and a limiting sleeve (6). The bottom end of the buffer (4) and the top end of the limiting sleeve (6) are set as inclined surfaces. The outer wall of the tail tube body (7) is fixedly connected to the upper part of the buffer (4) and a conical sleeve (11) is fixedly connected thereto. The bottom ends of the tube head (1) are fixedly connected to both sides of the tube head (1). The locking tube (9) has an arc-shaped through groove (28) at the top of the corresponding connecting rod (19). The inner walls of the locking tube (9) have receiving grooves (20) on both sides. A locking block (17) is rotatably connected to one side of the inner wall of the receiving groove (20). The top of the locking block (17) has an arc-shaped groove (27). The bottom of the connecting rod (19) is respectively located inside the corresponding arc-shaped groove (27). A locking ring (18) is fixedly connected to the outer wall of the tail tube body (7) above the locking block (17). Locking grooves (26) are provided on both sides of the locking ring (18), and fixing rods (22) are fixedly connected to both sides of the tube head (1). Limiting plates (23) are fixedly connected to one side of the fixing rods (22), and C-shaped handles (12) are slidably connected to the outer wall of the fixing rods (22). Springs (21) are installed in the cavity of the C-shaped handles (12) on the outer side of the fixing rods (22). Two insertion holes (29) are provided on both sides of the outer wall of the locking tube (9) corresponding to the bottom of the C-shaped handles (12). The inner wall of the connecting pipe (10) is fixedly connected to the top of the extrusion sleeve (13), and the inner wall of the connecting pipe (10) is provided with an extrusion groove (14) at the top position of the extrusion sleeve (13). The outer wall of the tail pipe body (7) is fixedly connected to a number of rubber blocks (15) above the extrusion groove (14). The top of the extrusion sleeve (13) is wedge-shaped, and the bottom of the rubber block (15) is provided with a slanted groove (16). The shape of the extrusion groove (14) is adapted to the shape of the outer wall of the rubber block (15).

2. The tailpipe hanger according to claim 1, characterized in that: The bottom end of each pressure rod (24) is fixedly connected to a stabilizing rod (25), and the inner wall of the connecting pipe (10) is provided with a stabilizing groove (5) at the position corresponding to the stabilizing rod (25). The outer wall of the stabilizing rod (25) is slidably connected to the inner wall of the stabilizing groove (5).

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