Recyclable expansion type patching tool

Abstract

The invention discloses a recyclable expansion type patching tool which is characterized in that a central pipe is arranged in an expansion pipe in a penetrating manner, and an expansion cone is arranged on the central pipe in a sleeving manner; the salvageable base is separably installed in the expansion pipe, a liquid inlet is formed between the salvageable base and the bottom end of the center pipe, and the liquid inlet is communicated with an annular space formed between the center pipe and the second pipe section; when the recyclable expansion type patching tool encounters resistance in the shaft, working fluid introduced into the central pipe can penetrate through the central hole to wash the shaft; when the recyclable expansion type patching tool is lowered to a damaged casing pipe, the throwing ball can enter the center hole through the pipe cavity and block the center hole, and the working liquid can enter the annular space through the liquid inlet and drive the expansion cone to ascend to expand the first pipe section. And the first pipe section is sealed and fixed with the sleeve through the annular sealing structure.

Description

Technical Field

[0001] This invention relates to the field of casing subsidy tool design technology, and in particular to a recyclable expansion subsidy tool. Background Technology

[0002] Currently, most oilfields are in the late stages of development. Due to long-term water injection development, coupled with frequent maintenance operations and the influence of many factors such as well structure, completion and cementing quality, casing material and corrosion, the casing in these oilfields is severely damaged, resulting in a large number of wells with casing damage. This can easily lead to the shutdown of a large number of oil wells, and may even cause damage to the injection and production system, excessive formation pressure drop, poor reserve control, and declining production, resulting in significant economic losses.

[0003] Repairing and patching damaged casing is therefore of paramount importance. Among related technologies, using expansion tubes for casing repair offers advantages such as high suspension force, high patching strength, strong sealing ability, high compressive strength, and large diameter, playing a crucial role in stabilizing oilfield production and improving the overall development efficiency of the oilfield.

[0004] In related technologies, when using expansion tubes to repair casing, a sealing bottom plug is typically used to seal the bottom of the expansion tube's inner cavity. This is then assembled to form a bottom-sealed repair tool, which is pressure tested on the ground and then shipped. During field construction, because the repair tool is bottom-sealed, it needs to be pressure-expanded directly on the ground after being lowered to the repair position in the wellbore. However, during the lowering process, obstacles such as sand accumulation or stuck drill bits are easily encountered in the wellbore. Since it hasn't been lowered to the repair position yet, pressure cannot be applied. Applying pressure prematurely would cause the expansion tube to expand prematurely, preventing repair at the intended position.

[0005] Therefore, the relevant technology typically involves raising the subsidy tool outside the wellbore, then using other tools to clear any obstructions from the wellbore, and finally lowering the subsidy tool back down. This process may involve multiple raising and lowering of the subsidy tool, leading to low efficiency in the subsidy operation and severely impacting normal oilfield production. Summary of the Invention

[0006] This invention discloses a recyclable expandable subsidy tool to solve the problem of low subsidy operation efficiency caused by the need to frequently lift the subsidy tool when it is obstructed during the lowering of the subsidy tool into the wellbore in related technologies.

[0007] To address the aforementioned technical problems, the present invention discloses the following technical solutions:

[0008] This invention discloses a recyclable expandable patching tool for patching damaged sleeves. The recyclable expandable patching tool includes a central tube, an expansion tube, an expansion cone, a throwing ball, and a retrieval base; wherein:

[0009] The expansion tube includes a first pipe section, a second pipe section, and an annular sealing structure disposed on the outer peripheral wall of the first pipe section, wherein the second pipe section is located below the first pipe section;

[0010] The central tube passes through the expansion tube, and the expansion cone is sleeved on the central tube and located between the bottom end of the central tube and the second tube segment;

[0011] The retrieval base is detachably installed in the expansion tube and located below the bottom end of the central tube. An inlet is formed between the retrieval base and the bottom end of the central tube, and the inlet communicates with the annular space formed between the central tube and the second tube segment.

[0012] The lumen of the central tube, the central hole of the retrieval base, and the wellbore are connected in sequence. When the recirculating expansion tool encounters obstruction in the wellbore, the working fluid introduced into the central tube will pass through the central hole and flush the wellbore.

[0013] When the recyclable expansion tool is lowered to the damaged sleeve, the ball can enter the central hole through the lumen and seal the central hole. The working fluid can enter the annular space through the inlet and drive the expansion cone upward to expand the first pipe section, so that the first pipe section is sealed and fixed to the sleeve through the annular sealing structure.

[0014] In one embodiment, there are multiple annular sealing structures, and the multiple annular sealing structures are axially spaced apart in the first pipe section.

[0015] In one embodiment, the expansion tube further includes a third pipe section, which is a tapered section. The small end of the third pipe section is connected to the first pipe section, and the large end of the third pipe section is connected to the second pipe section. The tapered surface of the expansion cone is adapted to the shape of the pipe wall of the third pipe section.

[0016] In one embodiment, the bottom end of the central tube is provided with a hooking protrusion, which is located below the expansion cone and is used to hook and cooperate with the expansion cone so that the expansion cone can move upward with the central tube.

[0017] In one embodiment, the hook protrusion is an annular protrusion, and the hook protrusion extends around the outer peripheral wall of the central tube.

[0018] In one embodiment, the recyclable expandable subsidy tool further includes a retrieval tool, the retrieval tool including a contact joint, the central hole being a stepped hole, the stepped hole including a small hole segment and a large hole segment, the small hole segment being located below the large hole segment, the ball being used to seal and cooperate with the small hole segment, and the contact joint being used to extend into the large hole segment and engage with the large hole segment.

[0019] In one embodiment, the inner wall of the large hole section is provided with an annular groove, and the contact joint is a claw. When the contact joint extends into the large hole section, the claw extends into the annular groove and engages with the annular groove.

[0020] In one embodiment, the retrievable base is fixed to the expansion tube by a connecting assembly. The outer peripheral wall of the retrievable base includes a tapered section. The connecting assembly includes a kit, the bottom end of which is a tapered sleeve section. The tapered sleeve section is adapted to the tapered section and is pressed between the expansion tube and the tapered section to support the retrievable base in the expansion tube.

[0021] In one embodiment, the retrieval base includes a mounting slot, the mounting slot including a first inner wall and a second inner wall opposite to each other, the second inner wall being located below the first inner wall and above the conical segment; the connecting assembly further includes a locking block, the locking block being connected to the kit and extending into the mounting slot, the locking block being able to engage with the second inner wall so that the kit can move upward with the retrieval base; the first inner wall being able to engage with the kit for limiting movement.

[0022] In one embodiment, the recyclable expandable subsidy tool further includes a guide head, which is a conical structure. The guide head is connected to the bottom end of the retrieval base by a threaded engagement and communicates with the central hole.

[0023] The technical solutions disclosed in the embodiments of the present invention have the following technical effects:

[0024] The recirculating expandable patching tool disclosed in this invention can remain in an unblocked state during descent. When encountering obstruction, working fluid can be introduced to circulate it. This circulation flushes away any obstructions below the tool, allowing it to descend normally and patch damaged casing. This structure overcomes obstructions during descent into the wellbore, eliminating the need for frequent tool retraction and reducing operational efficiency. Attached Figure Description

[0025] Figure 1This is a schematic diagram of the structure of the recyclable expansion subsidy tool disclosed in the embodiments of the present invention.

[0026] The components in the diagram are labeled as follows:

[0027] 10-Sheath, 01-Inlet, 02-Annular space

[0028] 20-Central tube, 21-Lumen, 22-Hanging protrusion

[0029] 30 - Expansion pipe, 31 - First pipe section, 32 - Second pipe section, 33 - Annular sealing structure, 34 - Third pipe section

[0030] 40-Expansion Cone

[0031] 51-Throwing ball, 52-Retrieving tool, 60-Retrievable base, 61-Center hole, 611-Small hole section, 612-Large hole section, 613-Conical section, 614-Hanging groove, 615-Annular slot, 70-Connecting component, 71-Kit, 711-Conical sleeve section, 72-Card block, 80-Guide head. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below in conjunction with specific embodiments and corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0033] The technical solutions disclosed in the various embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0034] Please refer to Figure 1 This invention discloses a recyclable expandable patching tool for patching damaged sleeves 10. The recyclable expandable patching tool includes a central tube 20, an expansion tube 30, an expansion cone 40, a throwing ball 51, and a retrieval base 60.

[0035] The central tube 20 is the main frame of the recirculating expandable tool. The central tube 20 is used to connect with the lowering equipment (e.g., drill pipe), thereby connecting the entire recirculating expandable tool to the lowering equipment. Driven by the lowering equipment, the entire recirculating expandable tool can be lowered to a predetermined position in the wellbore.

[0036] The expansion tube 30 is a tubular component that needs to be expanded and tightened onto the inner wall of the damaged casing 10. After being tightened, the expansion tube 30 is finally fixedly connected to the damaged casing 10, thereby patching the damaged casing 10 and replacing it to cooperate with other undamaged casings 10 in the wellbore to form a new wellbore.

[0037] In this embodiment of the invention, the expansion tube 30 is a stepped pipe fitting, comprising a first pipe section 31, a second pipe section 32, and an annular sealing structure 33 disposed on the outer peripheral wall of the first pipe section 31. The second pipe section 32 is located below the first pipe section 31. The first pipe section 31 has a smaller diameter than other parts of the expansion tube 30 (e.g., the second pipe section 32), and is the portion of the expansion tube 30 that will be expanded and tightened onto the inner wall of the damaged sleeve 10. That is, the diameter of the second pipe section 32 is larger than the diameter of the first pipe section 31.

[0038] It should be noted that after the first pipe section 31 expands, its diameter increases, causing the annular sealing structure 33 mounted on it to tighten onto the damaged sleeve 10. The annular sealing structure 33 achieves a tight seal with the inner wall of the damaged sleeve 10, ensuring both tightening and sealing to replace the damaged sleeve 10. The expansion pipe 30 is also fitted outside the central pipe 20.

[0039] In this embodiment of the invention, the central tube 20 passes through the expansion tube 30, and the expansion cone 40 is sleeved on the central tube 20 and located between the central tube 20 and the second tube segment 32, with the expansion cone 40 in contact with the second tube segment 32. The expansion cone 40 can slide relative to the central tube 20 and the second tube segment 32 when subjected to a large driving force. Once the working fluid enters the space where the expansion cone 40 is located, it will drive the expansion cone 40 upwards, forcibly sliding it between the central tube 20 and the first tube segment 31. Because the diameter of the expansion cone 40 is large, it will expand the first tube segment 31 as it moves upwards along the central tube 20. Essentially, the expansion cone 40 is positioned between the central tube 20 and the second tube segment 32, effectively connecting the second tube segment 32 and the central tube 20 when not subjected to a large driving force, thereby achieving the connection between the central tube 20 and the expansion tube 30.

[0040] The retrieval base 60 is detachably installed in the expansion tube 30 and located below the bottom end of the central tube 20. An inlet 01 is formed between the retrieval base 60 and the bottom end of the central tube 20, and the inlet 01 communicates with the annular space 02 formed between the central tube 20 and the second tube segment 32. The lumen 21 of the central tube 20, the central hole 61 of the retrieval base 60, and the wellbore are sequentially connected.

[0041] When the recirculating expandable tool encounters obstruction in the wellbore, the working fluid (e.g., water) introduced into the central tube 20 will pass through the central hole 61 and flush the wellbore. In other words, during the downward movement of the recirculating expandable tool in the wellbore, if it encounters an obstruction below the wellbore, working fluid (e.g., water) is introduced from the top of the central tube 20. The working fluid will enter the central hole 61 of the retrieval base 60 from the lumen 21 of the central tube 20, and eventually flow out of the recirculating expandable tool, thus flushing away the obstruction below it.

[0042] When the recyclable expansion tool is lowered to the damaged sleeve 10, the ball 51 can be thrown. The ball 51 can enter the central hole 61 through the lumen 21 of the central tube 20 and block the central hole 61. The working fluid can enter the annular space 02 through the inlet 01 and drive the expansion cone 40 to rise to expand the first pipe section 31, so that the first pipe section 31 is sealed and fixed to the sleeve 10 through the annular sealing structure 33.

[0043] The working process of the recyclable expandable tool disclosed in this embodiment of the invention is as follows: The recyclable expandable tool is lowered into the wellbore using a lowering device. The ball dropper 51 is not deployed immediately. As the recyclable expandable tool continues to descend, if it encounters resistance in the wellbore, working fluid is introduced into the central tube 20. The working fluid flows downwards along the lumen 21 of the central tube 20 and then flows into the wellbore through the central hole 61 of the retrieval base 60, thereby flushing away any obstructions below the recyclable expandable tool. After the obstructions are flushed away, the recyclable expandable tool continues to descend until it reaches the damaged casing 10 at a preset depth in the wellbore.

[0044] After the recyclable expansion patch tool reaches its position, the ball 51 can be dropped. Under the influence of gravity, the ball 51 descends along the cavity 21 of the central tube 20 and eventually lands on the retrieval base 60, sealing the central hole 61 of the retrieval base 60, thus providing conditions for the collection of working fluid. The collected working fluid will gradually increase in pressure and enter the annular space 02 through the inlet 01 to drive the expansion cone 40 upward to expand the first pipe section 31, and make the first pipe section 31 sealed and fixed to the sleeve 10 through the annular sealing structure 33, ultimately realizing the patching of the damaged sleeve 10 by the expansion tube 30.

[0045] As can be seen from the above working process, the recirculating expandable patching tool disclosed in this embodiment of the invention can remain in a non-blocked state during the descent. This allows for the introduction of working fluid to circulate when obstruction is encountered. The circulation of the working fluid flushes away any obstructions below the recirculating expandable patching tool, thereby eliminating the obstruction and allowing the tool to be lowered normally. Once lowered into place, it can patch the damaged casing 10. This type of recirculating expandable patching tool can overcome obstructions during its descent into the wellbore, thus eliminating the need for frequent tool retraction when encountering obstruction, which leads to low operational efficiency.

[0046] As described above, after expansion, the expansion tube 30 is sealed to the sleeve 10 through the annular sealing structure 33. The expansion tube 30 may contain one or more annular sealing structures 33, and this embodiment of the invention is not limited thereto. In one embodiment, there are multiple annular sealing structures 33, which can be distributed axially at intervals along the first pipe segment 31. This structure allows the first pipe segment 31 to be sealed and fixed to the sleeve 10 through multiple annular sealing structures 33 along its axial direction after expansion, thus improving the sealing effect.

[0047] The expansion tube 30 disclosed in this embodiment of the invention may only include the first tube segment 31 and the second tube segment 32 mentioned above. The expansion cone 40, in its original position, is fitted onto the central tube 20 and contacts the second tube segment 32. During expansion, the expansion cone 40 moves upward along the central tube 20, thereby forcibly sliding from the second tube segment 32 into the first tube segment 31, ultimately expanding the first tube segment 31. To facilitate the sliding of the expansion cone 40 into the first tube segment 31, in a further optional embodiment, the expansion tube 30 disclosed in this embodiment of the invention may also include a third tube segment 34. The third tube segment 34 is a tapered segment, with its small end connected to the first tube segment 31 and its large end connected to the second tube segment 32. The tapered surface of the expansion cone 40 is adapted to the shape of the tube wall of the third tube segment 34. This structure not only allows the expansion cone 40 fitted onto the central tube 20 to better engage with the expansion tube 30 through the conical surface, but also allows the expansion cone 40 to slide into the first tube section 31 through the third tube section 34. Since the third tube section 34 is a conical section, it makes it easier for the expansion cone 40 to slide into the first tube section 31, which ultimately benefits subsequent expansion.

[0048] After the expansion operation is completed, the expansion pipe 30, being fixedly connected to the damaged casing 10, will remain in the wellbore, while other components will be retrieved. To facilitate the retrieval of the expansion cone 40, in one optional embodiment, the bottom end of the central pipe 20 can be provided with a hook-on protrusion 22. The hook-on protrusion 22 is located below the expansion cone 40 and is used to hook and engage with the expansion cone 40, allowing the expansion cone 40 to move upwards with the central pipe 20. During the actual operation, as the central pipe 20 moves upwards, the hook-on protrusion 22 engages with the expansion cone 40, thus lifting the expansion cone 40 and achieving the purpose of retrieving it together.

[0049] More specifically, the hook-on protrusion 22 can be an annular protrusion that extends around the outer peripheral wall of the central tube 20. In this case, the hook-on protrusion 22 can hook onto the expansion cone 40 from all directions, thereby improving the stability of the hook-on.

[0050] In addition to the central tube 20 and the expansion cone 40, the retrieval base 60 also needs to be retrieved. Therefore, the recyclable expansion-type subsidy tool disclosed in this embodiment of the invention may further include a retrieval tool 52, which includes a contact joint. The central hole 61 can be a stepped hole, which may include a connected small hole segment 611 and a large hole segment 612. The small hole segment 611 is located below the large hole segment 612. The ball 51 is used to seal and engage with the small hole segment 611. The contact joint is used to extend into the large hole segment 612 and engage with it. This structure of the retrieval base 60 does not affect the sealing and engagement with the ball 51, while also facilitating retrieval. During the lowering process, the contact joint extends to the large hole segment 612 and engages with it. After engagement, it pulls the retrieval base 60 upwards, ultimately achieving retrieval.

[0051] In this embodiment of the invention, the inner wall of the large-hole section 612 may be provided with an annular groove 615, and the contact joint may be a claw. When the contact joint extends into the large-hole section 612, the claw extends into the annular groove 615, ultimately achieving a hook-and-play engagement with the annular groove 615. In other embodiments, the contact joint may be a magnetic connector, which connects to the retrieval base 60 through contact, thereby preparing for subsequent retrieval.

[0052] In this embodiment of the invention, the retrievable base 60 can be fixed to the expansion tube 30 by a connecting component 70. The outer peripheral wall of the retrievable base 60 may include a tapered section 613, and the connecting component 70 may include a fitting 71. The bottom end of the fitting 71 may be a tapered sleeve section 711, which is adapted to the tapered section 613 and is pressed between the expansion tube 30 and the tapered section 613 to support the retrievable base 60 within the expansion tube 30. In this case, the gravity of the retrievable base 60 will cause the tapered section 613 to press down on the tapered sleeve section 711, further pressing and fixing the tapered sleeve section 711 within the expansion tube 30, while simultaneously supporting the tapered section 613, ultimately achieving the installation of the retrievable base 60 within the expansion tube 30. This structure can prevent the retrievable base 60 from falling downwards while not affecting its upward movement. During the retrieval of the retrieval base 60, the retrieval tool 52 can be connected to the retrieval base 60 and pull the retrieval base 60 upward. During this process, the conical section 613 can be retrieved from the conical sleeve section 711 without being interfered with by the conical sleeve section 711.

[0053] In a further technical solution, as the retrieval base 60 is retrieved, the connecting assembly 70 no longer needs to remain in the expansion tube 30. Therefore, the connecting assembly 70 also needs to be retrieved. Based on this, in a further solution, the retrieval base 60 may include a mounting groove 614, which includes opposing first and second inner walls. The second inner wall is located below the first inner wall and above the conical section 613. The connecting assembly 70 may also include a locking block 72, which is connected to the kit 71 and extends into the mounting groove 614. The locking block 72 can engage with the second inner wall to allow the kit 71 to move upward with the retrieval base 60. During the retrieval process of the retrieval base 60, as the retrieval base 60 moves upward, the conical section 613 disengages from the conical sleeve section 711, thereby preventing the kit 71 from being compressed and contracted, and thus at least a portion of it separates from the inner wall of the expansion tube 30, making it easier to move upward. Since the second inner wall will interfere with the locking block 72, the retrieval base 60 will eventually drive the kit 71 upward through the locking block 72, thus achieving the retrieval of the connecting component 70.

[0054] In a further embodiment, the first inner wall can engage with the kit 71 in the downward direction to prevent the retrieveable base 60 from descending excessively relative to the kit 71. Simultaneously, the end of the retrieveable base 60 containing the first inner wall can make sealing contact with the inner wall of the expansion tube 30, thereby achieving a seal between the retrieveable base 60 and the expansion tube 30. This ensures that when the ball 51 falls into the central hole 61 of the retrieveable base 60, it forms a complete seal within the expansion tube 30, ultimately allowing the working fluid transported by the cavity 21 of the central tube 20 to enter the annular space 02 through the inlet 01, generating pressure to drive the expansion cone 40 upward.

[0055] To facilitate the descent of the recirculating expandable subsidy tool, the recirculating expandable subsidy tool disclosed in this embodiment of the invention may further include a guide head 80. The guide head 80 may be a conical structure, and is connected to the bottom end of the retrieval base 60 via a threaded connection, and communicates with the central hole 61. Because the guide head 80 is a conical structure, it facilitates the descent of the entire recirculating expandable subsidy tool into the wellbore without affecting the circulation of the working fluid when encountering resistance.

[0056] The embodiments of the present invention have been described above with reference to the accompanying drawings. However, the present invention is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of the present invention without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of the present invention.

Claims

1. A recyclable expansion patching tool for patching damaged sleeves (10), characterized in that, The recyclable expandable subsidy tool includes a central tube (20), an expansion tube (30), an expansion cone (40), a throwing ball (51), and a retrieval base (60); wherein: The expansion tube (30) includes a first pipe section (31), a second pipe section (32), and an annular sealing structure (33) disposed on the outer peripheral wall of the first pipe section (31), wherein the second pipe section (32) is located below the first pipe section (31); The central tube (20) passes through the expansion tube (30), and the expansion cone (40) is sleeved on the central tube (20) and located between the bottom end of the central tube (20) and the second tube segment (32); The retrievable base (60) is detachably installed in the expansion tube (30) and located below the bottom end of the central tube (20). An inlet (01) is formed between the retrievable base (60) and the bottom end of the central tube (20). The inlet (01) is connected to the annular space (02) formed between the central tube (20) and the second tube segment (32). The lumen (21) of the central tube (20), the central hole (61) of the retrieval base (60) and the wellbore are connected in sequence. When the recirculating expansion tool encounters obstruction in the wellbore, the working fluid introduced into the central tube (20) will pass through the central hole (61) and flush the wellbore. When the recyclable expansion tool is lowered to the damaged sleeve (10), the ball (51) can enter the central hole (61) through the lumen (21) and block the central hole (61). The working fluid can enter the annular space (02) through the inlet (01) and drive the expansion cone (40) to rise to expand the first pipe section (31), so that the first pipe section (31) is sealed and fixed to the sleeve (10) through the annular sealing structure (33).

2. The recyclable expansion subsidy tool according to claim 1, characterized in that, There are multiple annular sealing structures (33), and the multiple annular sealing structures (33) are distributed axially at intervals in the first pipe section (31).

3. The recyclable expansion subsidy tool according to claim 1, characterized in that, The expansion tube (30) also includes a third tube section (34), which is a tapered section. The small end of the third tube section (34) is connected to the first tube section (31), and the large end of the third tube section (34) is connected to the second tube section (32). The tapered surface of the expansion cone (40) is adapted to the shape of the tube wall of the third tube section (34).

4. The recyclable expansion subsidy tool according to claim 1, characterized in that, The bottom end of the central tube (20) is provided with a hook protrusion (22). The hook protrusion (22) is located below the expansion cone (40) and is used to hook and cooperate with the expansion cone (40) so that the expansion cone (40) can move upward with the central tube (20).

5. The recyclable expansion subsidy tool according to claim 4, characterized in that, The hook protrusion (22) is an annular protrusion, and the hook protrusion (22) extends around the outer peripheral wall of the central tube (20).

6. The recyclable expansion subsidy tool according to claim 1, characterized in that, The recyclable expandable subsidy tool also includes a retrieval tool (52), which includes a contact joint. The central hole (61) is a stepped hole, which includes a small hole section (611) and a large hole section (612). The small hole section (611) is located below the large hole section (612). The ball thrower (51) is used to block and cooperate with the small hole section (611). The contact joint is used to extend into the large hole section (612) and engage with it.

7. The recyclable expansion subsidy tool according to claim 6, characterized in that, The inner wall of the large hole section (612) is provided with an annular groove (615), and the contact joint is a claw. When the contact joint extends into the large hole section (612), the claw extends into the annular groove (615) and engages with the annular groove (615).

8. The recyclable expansionary subsidy tool according to claim 1, characterized in that, The retrievable base (60) is fixed in the expansion tube (30) by a connecting assembly (70). The outer peripheral wall of the retrievable base (60) includes a tapered section (613). The connecting assembly (70) includes a kit (71). The bottom end of the kit (71) is a tapered sleeve section (711). The tapered sleeve section (711) is adapted to the tapered section (613) and is pressed between the expansion tube (30) and the tapered section (613) to support the retrievable base (60) in the expansion tube (30).

9. The recyclable expansion subsidy tool according to claim 8, characterized in that, The retrievable base (60) includes a mounting groove (614), which includes a first inner wall and a second inner wall opposite to each other. The second inner wall is located below the first inner wall and above the tapered section (613). The connecting assembly (70) also includes a locking block (72), which is connected to the kit (71) and extends into the mounting groove (614). The locking block (72) can engage with the second inner wall so that the kit (71) can move upward with the retrievable base (60). The first inner wall can engage with the kit (71) for limiting.

10. The recyclable expansion subsidy tool according to claim 1, characterized in that, The recyclable expandable subsidy tool also includes a guide head (80), which is a conical structure. The guide head (80) is connected to the bottom end of the retrievable base (60) by a threaded connection and communicates with the central hole (61).

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