Suspension packer tie-back barrel for shaft reconstruction

Abstract

The invention relates to the technical field of oil and gas field exploitation, and provides a suspension packer tie-back cylinder for shaft reconstruction, which comprises a feeding pipe, a first expansion cone and a tie-back cylinder are fixedly sleeved on the feeding pipe, the tie-back cylinder is sleeved on one end of the first expansion cone far away from the feeding pipe, and the tie-back cylinder is connected with the first expansion cone through a pin. An annular cavity is formed between the tie-back barrel and the first expansion cone, the bottom end of the feeding pipe penetrates through the first expansion cone and is located in the tie-back barrel, the suspension packer is connected with the end, away from the first expansion cone, of the tie-back barrel, a second expansion cone is further arranged in the suspension packer, and the second expansion cone is fixedly connected with the bottom end of the feeding pipe. The tie-back barrel has an expansion function and is provided with a pressure-bearing structure, the top of the tie-back barrel can expand outwards, the drift diameter of the top of the tie-back barrel is increased, and therefore a bridge plug can smoothly pass through the tie-back barrel, the cement paste injection process is omitted, damage to the tie-back barrel is reduced, the operation process is simplified, and the construction efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of oil and gas field exploitation, and more specifically, to a hanging packer tie-back cylinder for wellbore reconstruction. Background Art

[0002] In the field of oil exploitation, wellbore reconstruction technology is crucial for ensuring the continuous and efficient production of oil wells. With the continuous deepening of oil and gas field development, especially for horizontal wells in tight oil and gas, shale oil and gas, etc., the demand for high-efficiency volume repeated fracturing technology is increasing day by day.

[0003] During the wellbore reconstruction process, the tie-back cylinder is an important component for realizing key connections. The tie-back cylinder can directly connect the liner to the wellhead. Whether it is for liner tie-back or liner tie-back fracturing operations, the tie-back cylinder is indispensable. However, there are technical problems in the application of the tie-back cylinder in the prior art. In liner cementing, cement stone remains on the inner wall of the bell mouth of the tie-back cylinder, and a drill bit is needed to clean the residual cement stone. When cleaning, the drill bit is likely to damage the bell mouth of the tie-back cylinder. After the bell mouth of the tie-back cylinder is damaged, a milling cone is usually used to mill and repair the bell mouth of the tie-back cylinder. During milling, the sealing surface may be milled and damaged, resulting in the failure of the sealing surface. This not only damages the tie-back cylinder but also makes the operation cumbersome, greatly reducing the construction efficiency and increasing the exploitation cost.

[0004] In addition, during workover operations, if the upper string and the lower string of the tie-back cylinder are misaligned, a step will be formed between them, causing the tool string to encounter resistance when passing through and unable to descend smoothly. In staged fracturing operations, once the bridge plug setting tool is misaligned with the tie-back cylinder, the bridge plug will not be able to pass through smoothly, directly resulting in the obstruction of the staged fracturing operation and the fracturing construction cannot proceed as planned, thereby affecting the transformation effect of the oil and gas well and ultimately resulting in poor oil and gas production in the later stage. Summary of the Invention

[0005] The purpose of the present invention is to provide a hanging packer tie-back cylinder for wellbore reconstruction, which has an expansion function and is equipped with a pressure-bearing structure. The top of the tie-back cylinder can expand outwards to increase the top diameter, so that the bridge plug can pass through smoothly. At the same time, the process of injecting cement slurry is omitted, the damage to the tie-back cylinder is reduced, the operation process is simplified, and the construction efficiency is improved.

[0006] To solve the above technical problems, the technical solution adopted in this application is as follows:

[0007] An embodiment of the present application provides a hanger packer tie-back cylinder for wellbore reconstruction, which includes a running-in string, a first expansion cone is sleeved and fixed on the running-in string, a tie-back cylinder, the tie-back cylinder is sleeved on one end of the first expansion cone away from the running-in string, and the tie-back cylinder is connected to the first expansion cone by a pin. An annular cavity is formed between the tie-back cylinder and the first expansion cone. The bottom end of the running-in string passes through the first expansion cone and is located inside the tie-back cylinder. A hanger packer is connected to one end of the tie-back cylinder away from the first expansion cone. A second expansion cone is further arranged inside the hanger packer, and the second expansion cone is fixedly connected to the bottom end of the running-in string.

[0008] The top of the tie-back cylinder is connected to the first expansion cone. By pumping pressure into the running-in string through a hydraulic pump, first, the variable-diameter expansion male cone and the variable-diameter expansion female cone are completely closed, and then the first expansion cone is driven to perform an expansion operation on the upper part of the tie-back cylinder. When the limit sensor gives an indication, it means that the first expansion cone has reached the designated position, and pressure relief operation can be carried out on the first expansion cone to prevent the first expansion cone from being driven downward. There are several flat tooth holes on the outer wall of the top of the tie-back cylinder, and flat teeth are inlaid in the flat tooth holes. When the tie-back cylinder expands, the flat teeth inlaid on the outer wall will be in close contact with the inner wall of the casing, increasing the friction between the tie-back cylinder and the inner wall of the casing, and capable of increasing the pressure-bearing capacity of the tie-back cylinder. After the upper part of the tie-back cylinder expands, it can prevent the bridge plug from being blocked during running-in and meet the passing of large-size bridge plugs. Through the flat tooth anchoring device, the cementing construction steps can be omitted, the construction process can be simplified, and the damage of the tie-back cylinder can be avoided.

[0009] The whole device is sent into the wellbore through the running-in string. The first expansion cone, the tie-back cylinder, and the hanger packer are connected in sequence. The running-in string provides a conveying channel and support for other components. The first expansion cone and the tie-back cylinder are connected by a pin to form an annular cavity, which is convenient for expansion operation. The second expansion cone in the hanger packer is fixedly connected to the bottom end of the running-in string, ensuring the coordinated work of each component in the wellbore, laying a foundation for the subsequent realization of functions in the wellbore, and ensuring that the entire tie-back cylinder device can be smoothly lowered into the wellbore and operate stably.

[0010] Further, the above-mentioned first expansion cone is a variable-diameter expansion cone, which includes a variable-diameter expansion male cone and a variable-diameter expansion female cone. The variable-diameter expansion male cone is fixedly connected to the running-in string, and the variable-diameter expansion female cone is connected to the tie-back cylinder by a pin. A protrusion is arranged on the variable-diameter part of the variable-diameter expansion male cone, and a sliding groove is arranged on the variable-diameter part of the variable-diameter expansion female cone. The protrusion is in sliding fit with the sliding groove to enable the first expansion cone to be closed or unfolded. The variable-diameter expansion male cone and the female cone are closed or unfolded through the sliding fit of the protrusion and the sliding groove under the action of hydraulic pressure or other external forces. When closed, it is convenient for the device to be lowered into the wellbore. When unfolded, the tie-back cylinder can be expanded. The variable-diameter structure makes the expansion operation more flexible and accurate, can adjust the expansion state according to actual needs, improves the adaptability and reliability of the tie-back cylinder, and reduces the risk of damage caused by improper expansion operation.

[0011] Furthermore, a number of flat tooth holes are provided on the outer side wall of the above-mentioned back connection cylinder, and flat teeth are embedded in each of the a number of flat tooth holes. The flat teeth are used to enhance the pressure-bearing capacity after expansion. After the back connection cylinder expands, the flat teeth embedded in the outer side wall are in close contact with the inner wall of the casing, increasing the contact area and friction force, thereby improving the pressure-bearing capacity of the back connection cylinder, effectively enhancing the pressure-bearing performance of the back connection cylinder, ensuring that the back connection cylinder can work stably under the high-pressure environment in the wellbore, reducing the leakage risk, and improving the safety and stability of the mining operation.

[0012] Furthermore, a limit sensor is provided on the inner wall of the above-mentioned back connection cylinder. The limit sensor monitors the displacement of the first expansion cone in real time. When the first expansion cone moves to the set position, it triggers the pressure relief stop operation and stops expanding, preventing over-expansion from damaging the back connection cylinder or other components, precisely controlling the expansion degree of the first expansion cone, avoiding damage to the back connection cylinder or seal failure caused by over-expansion, extending the service life of the back connection cylinder, and improving the accuracy and safety of the construction.

[0013] Furthermore, the above-mentioned limit sensor includes an infrared transmitting end and an infrared receiving end. The infrared transmitting end and the infrared receiving end are symmetrically arranged on the inner wall of the back connection cylinder, and the infrared transmitting end is aligned with the infrared receiving end for detecting the displacement position of the first expansion cone. When the first expansion cone moves to the position of the infrared transmitting end, the infrared receiving end receives the signal and triggers the pressure relief to stop the expansion action. The limit sensor composed of the infrared transmitting end and the receiving end utilizes the principle of infrared signal transmission. When the first expansion cone blocks the infrared signal, the infrared receiving end cannot receive the signal, triggering the pressure relief device to stop the expansion action. Using infrared sensing technology, it is sensitive in response, can quickly and accurately detect the position of the first expansion cone, realize automatic control, reduce human operation errors, and further improve the accuracy and safety of the expansion operation.

[0014] Furthermore, an expansion indicator is provided on the bottom side wall of the above-mentioned second expansion cone. The expansion indicator on the bottom side wall of the second expansion cone changes as the hanging packer expands. Through this change, the expansion state of the hanging packer is visually reflected. The operator can directly observe the expansion situation of the hanging packer, timely grasp the construction progress, facilitate making the next operation decision, and improve the construction efficiency and accuracy.

[0015] Furthermore, the above-mentioned expansion indicator is a pressure sensing device for real-time feedback of the expansion state of the hanging packer. The expansion indicator of the pressure sensing device provides real-time feedback of the expansion state according to the pressure change during the expansion of the hanging packer. The pressure change is associated with the expansion degree, providing real-time and accurate expansion state information, enabling the operator to more precisely control the expansion process, ensuring that the hanging packer achieves the best sealing and fixing effect, and improving the construction quality.

[0016] Furthermore, the above-mentioned hanging packer forms a sealing and fixing structure by closely adhering to the inner wall of the casing through the radial expansion of the second expansion cone. The second expansion cone expands radially under the action of hydraulic pressure or other external forces, causing the hanging packer to closely fit the inner wall of the casing, forming a sealing and fixing structure to prevent fluid leakage and pipe string movement in the wellbore, effectively ensuring the sealing performance in the wellbore and the stability of the pipe string, reducing the impact of fluid channeling and pipe string sway on the production operation, and improving the production efficiency and oil and gas production.

[0017] Furthermore, the above-mentioned first expansion cone and second expansion cone achieve the expansion action through a hydraulic drive device. The hydraulic drive device applies pressure to the first expansion cone and the second expansion cone, causing changes in their internal structures, thereby achieving the expansion action. By utilizing the incompressibility of the liquid to transmit pressure, it has the advantages of stable power, convenient operation, easy control, etc., and can ensure that the expansion action is carried out smoothly and reliably, improving the efficiency and accuracy of the expansion operation.

[0018] Furthermore, the side wall of the feeding pipe is provided with threads, and the first expansion cone is threadedly connected to the feeding pipe. The threads on the side wall of the feeding pipe cooperate with the threads of the first expansion cone to achieve the detachable connection between the two, facilitating the installation, disassembly, and adjustment of the position of the first expansion cone, making it convenient for the assembly and maintenance of the device, reducing the construction cost and difficulty, improving the construction efficiency, and also facilitating the replacement or adjustment of the first expansion cone under different working conditions, enhancing the adaptability of the device.

[0019] Compared with the prior art, the embodiments of the present invention have at least the following advantages or beneficial effects:

[0020] 1. Through the first expansion cone of the present invention, the upper part of the tie-back cylinder expands outward, expanding its top end, which can align the bridge plug running tool with the tie-back cylinder, and there will be no bridge plug jamming. In addition, it can also meet the passage of large-size bridge plugs, realizing large-displacement construction during fracturing and increasing the later production. It has broad application prospects in wellbore reconstruction.

[0021] 2. The present invention does not require cement slurry injection for cementing construction. There will be no cement stone left on the inner wall of the top of the tie-back cylinder, nor is it necessary to clean the residual cement stone, and during the cleaning, the top of the tie-back cylinder will not be damaged. In addition, there are several flat teeth on the outer wall of the upper part of the tie-back cylinder. After the tie-back cylinder expands, the flat teeth embedded on the outer side wall are in close contact with the inner wall of the casing, increasing the contact area and friction force, thereby improving the pressure-bearing capacity of the tie-back cylinder. The present invention can reduce the construction steps and the damage to the top of the tie-back cylinder. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings.

[0023] Figure 1 Schematic diagram of an assembly structure of a hanging packer tie-back cylinder for wellbore reconstruction provided by the present invention;

[0024] Figure 2 Schematic diagram of the tie-back cylinder structure of a hanging packer tie-back cylinder for wellbore reconstruction provided by the present invention;

[0025] Figure 3 Schematic diagram of the closing of the first expansion cone for a hanging packer tie-back cylinder for wellbore reconstruction provided by the present invention.

[0026] Reference numerals: 1 - feeding pipe; 2 - first expansion cone; 3 - pin; 4 - limit sensor; 5 - tie-back cylinder; 6 - second expansion cone; 7 - expansion indicator; 8 - hanging packer; 111 - variable diameter expansion male cone; 112 - variable diameter expansion female cone; 113 - flat teeth. Detailed embodiments

[0027] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Usually, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0028] Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the present invention claimed, but merely represents the selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention.

[0029] The features and performance of the present invention will be further described in detail below in conjunction with the embodiments.

[0030] Embodiment

[0031] Please refer to Figures 1-3 , Figure 1 as shown in the schematic diagram of the assembly structure of the present invention; Figure 2 as shown in the schematic diagram of the tie-back cylinder 5 structure of the present invention; Figure 3 as shown in the schematic diagram of the closing of the first expansion cone 2 of the present invention.

[0032] As Figures 1-3 shown, this embodiment provides a hanging packer tie-back cylinder for wellbore reconstruction, which includes a running-in pipe 1, a first expansion cone 2 is sleeved and fixed on the running-in pipe 1, a tie-back cylinder 5, the tie-back cylinder 5 is sleeved on one end of the first expansion cone 2 far away from the running-in pipe 1, and the tie-back cylinder 5 is connected to the first expansion cone 2 by a pin 3. An annular cavity is formed between the tie-back cylinder 5 and the first expansion cone 2. The bottom end of the running-in pipe 1 passes through the first expansion cone 2 and is located inside the tie-back cylinder 5. A hanging packer 8 is connected to one end of the tie-back cylinder 5 far away from the first expansion cone 2. A second expansion cone 6 is further arranged inside the hanging packer 8, and the second expansion cone 6 is fixedly connected to the bottom end of the running-in pipe 1.

[0033] As Figures 1-3 shown, in this embodiment, the above-mentioned first expansion cone 2 is a variable-diameter expansion cone, which includes a variable-diameter expansion male cone 111 and a variable-diameter expansion female cone 112. The variable-diameter expansion male cone 111 is fixedly connected to the running-in pipe 1, and the variable-diameter expansion female cone 112 is connected to the tie-back cylinder 5 by a pin 3. A protrusion is arranged on the variable-diameter part of the variable-diameter expansion male cone 111, and a chute is arranged on the variable-diameter part of the variable-diameter expansion female cone 112. The protrusion and the chute are slidably matched to enable the first expansion cone 2 to be closed or expanded.

[0034] In the above, the variable-diameter expansion male cone 111 and the female cone are slidably matched through the protrusion and the chute. Under the action of hydraulic pressure or other external forces, the first expansion cone 2 is closed or expanded. When closed, it is convenient for the device to be lowered into the wellbore. When expanded, the tie-back cylinder 5 can be expanded. The variable-diameter structure makes the expansion operation more flexible and precise, can adjust the expansion state according to actual needs, improves the adaptability and reliability of the tie-back cylinder 5, and reduces the damage risk caused by improper expansion operation.

[0035] As Figures 1-3 shown, in this embodiment, a plurality of flat tooth 113 holes are opened on the outer side wall of the above-mentioned tie-back cylinder 5, and flat teeth 113 are embedded in each of the plurality of flat tooth 113 holes. The flat teeth 113 are used to enhance the pressure-bearing capacity after expansion.

[0036] In the above, after the tie-back cylinder 5 is expanded, the flat teeth 113 embedded on the outer side wall are in close contact with the inner wall of the casing, increasing the contact area and friction force, thereby improving the pressure-bearing capacity of the tie-back cylinder 5, effectively enhancing the pressure-bearing performance of the tie-back cylinder 5, ensuring that the tie-back cylinder 5 can work stably under the high-pressure environment in the wellbore, reducing the leakage risk, and improving the safety and stability of the mining operation.

[0037] As Figures 1-3 shown, in this embodiment, a limit sensor 4 is arranged on the inner wall of the above-mentioned tie-back cylinder 5.

[0038] The above-mentioned middle limit sensor 4 monitors the displacement of the first expansion cone 2 in real time. When the first expansion cone 2 moves to the set position, it triggers the pressure relief stop operation and stops the expansion, preventing damage to the tie-back cylinder 5 or other components caused by over-expansion, precisely controlling the expansion degree of the first expansion cone 2, avoiding damage to the tie-back cylinder 5 or seal failure caused by over-expansion, extending the service life of the tie-back cylinder 5, and improving the accuracy and safety of the construction.

[0039] As Figures 1-3 shown, in this embodiment, the above-mentioned limit sensor 4 includes an infrared transmitting end and an infrared receiving end. The infrared transmitting end and the infrared receiving end are symmetrically arranged on the inner wall of the tie-back cylinder 5, and the infrared transmitting end is aligned with the infrared receiving end for detecting the displacement position of the first expansion cone 2.

[0040] When the first expansion cone 2 moves to the position of the infrared transmitting end, the infrared receiving end receives the signal and triggers the pressure relief to stop the expansion action. The limit sensor 4 composed of the infrared transmitting end and the receiving end utilizes the principle of infrared signal transmission. When the first expansion cone 2 blocks the infrared signal, the infrared receiving end cannot receive the signal, triggering the pressure relief device to stop the expansion action. Using infrared induction technology, it is sensitive and can quickly and accurately detect the position of the first expansion cone 2, realizing automatic control, reducing human operation errors, and further improving the accuracy and safety of the expansion operation.

[0041] As Figures 1-3 shown, in this embodiment, an expansion indicator 7 is provided on the bottom side wall of the second expansion cone 6.

[0042] The expansion indicator 7 on the bottom side wall of the second expansion cone 6 changes with the expansion of the hanging packer 8, intuitively reflecting the expansion state of the hanging packer 8 through this change. The operator can directly observe the expansion situation of the hanging packer 8, timely master the construction progress, facilitate making the next operation decision, and improve the construction efficiency and accuracy.

[0043] As Figures 1-3 shown, in this embodiment, the above-mentioned expansion indicator 7 is a pressure sensing device for real-time feedback of the expansion state of the hanging packer 8.

[0044] The expansion indicator 7 of the pressure sensing device in the above-mentioned real-time feedbacks the expansion state according to the pressure change during the expansion of the hanging packer 8. The pressure change is associated with the expansion degree, providing real-time and accurate expansion state information, enabling the operator to more precisely control the expansion process, ensuring that the hanging packer 8 achieves the best sealing and fixing effect, and improving the construction quality.

[0045] As Figures 1-3 shown, in this embodiment, the above-mentioned hanging packer 8 forms a sealing and fixing structure by tightly adhering to the inner wall of the casing through the radial expansion of the second expansion cone 6.

[0046] In the above, the second expansion cone 6 expands radially under the action of hydraulic pressure or other external forces, causing the hanging packer 8 to closely fit the inner wall of the casing, forming a sealing and fixing structure, preventing fluid leakage in the wellbore and pipe string movement, effectively ensuring the sealing performance in the wellbore and the stability of the pipe string, reducing the impact of fluid channeling and pipe string shaking on the mining operation, and improving the mining efficiency and oil and gas production.

[0047] As Figures 1-3 shown, in this embodiment, the above-mentioned first expansion cone 2 and second expansion cone 6 achieve the expansion action through a hydraulic drive device.

[0048] In the above, the hydraulic drive device applies pressure to the first expansion cone 2 and the second expansion cone 6, causing changes in their internal structures, thereby achieving the expansion action. By utilizing the incompressibility of the liquid to transmit pressure, it has the advantages of stable power, convenient operation, and easy control, etc. It can ensure that the expansion action is carried out smoothly and reliably, improving the efficiency and accuracy of the expansion operation.

[0049] As Figures 1-3 shown, in this embodiment, the side wall of the above-mentioned feeding pipe 1 is provided with threads, and the first expansion cone 2 is threadedly connected to the feeding pipe 1.

[0050] In the above, the threads on the side wall of the feeding pipe 1 and the threads of the first expansion cone 2 cooperate with each other to achieve the detachable connection of the two, facilitating the installation, disassembly and adjustment of the position of the first expansion cone 2, facilitating the assembly and maintenance of the device, reducing the construction cost and difficulty, improving the construction efficiency, and at the same time facilitating the replacement or adjustment of the first expansion cone 2 under different working conditions, enhancing the adaptability of the device.

[0051] During use, the first expansion cone 2, the tie-back cylinder 5, the hanging packer 8 and the casing are combined, and then connected to the first expansion cone 2 through the feeding pipe 1, and sent into the wellbore together and fixed at the required position. By pressurizing the drill pipe or tubing, first make the variable-diameter expansion male cone 111 and the variable-diameter expansion female cone 112 of the first expansion cone 2 fully close, and then drive the first expansion cone 2, so that the pin 3 is cut off. After the pin 3 is cut off, drive the first expansion cone 2 again to expand the upper part of the tie-back cylinder 5. The flat teeth 113 on the outside of the tie-back cylinder 5 will closely adhere to the inner wall of the casing, making the tie-back cylinder 5 have a pressure-bearing effect. When the first expansion cone 2 reaches the position of the limit sensor 4, relieve the pressure on the first expansion cone 2 to prevent it from continuing to move downward.

[0052] Pressurize the pipe string where the second expansion cone 6 is located, and then drive the second expansion cone 6 to expand the hanging packer 8 so that the outer side of the hanging packer 8 closely adheres to the inner wall of the casing. When the expansion indicator 7 gives a prompt, it indicates that the hanging packer 8 has completed expansion. Depressurize the pipe string where the second expansion cone 6 is located. After the depressurization is completed, lift the running pipe 1, the first expansion cone 2, and the second expansion cone 6 out of the wellbore to complete the fixation of the hanging packer 8, thereby achieving the effect of wellbore reconstruction.

[0053] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A hanging packer tie-back cylinder for wellbore reconstruction, characterized in that, including a feeding pipe, on which a first expansion cone is sleeved and fixed; a back connection cylinder, which is sleeved on one end of the first expansion cone away from the feeding pipe, and the back connection cylinder is connected to the first expansion cone by a pin. An annular cavity is formed between the back connection cylinder and the first expansion cone, and the bottom end of the feeding pipe passes through the first expansion cone and is located inside the back connection cylinder; a hanging packer, which is connected to one end of the back connection cylinder away from the first expansion cone. A second expansion cone is also arranged inside the hanging packer, and the second expansion cone is fixedly connected to the bottom end of the feeding pipe.

2. The hanging packer tie-back cylinder for wellbore reconstruction according to claim 1, wherein The first expansion cone is a variable-diameter expansion cone, including a variable-diameter expansion male cone and a variable-diameter expansion female cone. The variable-diameter expansion male cone is fixedly connected to the feeding pipe, and the variable-diameter expansion female cone is connected to the back connection cylinder by the pin. A protrusion is arranged on the variable-diameter part of the variable-diameter expansion male cone, and a chute is arranged on the variable-diameter part of the variable-diameter expansion female cone. The protrusion is slidably matched with the chute to enable the first expansion cone to be closed or unfolded.

3. A hanging packer tie-back housing for wellbore reconstruction according to claim 1, wherein, A plurality of flat tooth holes are formed in the outer side wall of the back connection cylinder, and flat teeth are embedded in each of the plurality of flat tooth holes. The flat teeth are used to enhance the pressure-bearing capacity after expansion.

4. A hanging packer tie-back cylinder for wellbore reconstruction according to claim 1, characterized in that, A limit sensor is arranged on the inner wall of the back connection cylinder.

5. A hanger packer tie-back housing for wellbore reconstruction according to claim 4, wherein, The limit sensor includes an infrared emission end and an infrared reception end. The infrared emission end and the infrared reception end are symmetrically arranged on the inner wall of the back connection cylinder, and the infrared emission end is aligned with the infrared reception end for detecting the displacement position of the first expansion cone.

6. A hanger packer tie-back housing for wellbore reconstruction according to claim 1, characterized in that, An expansion indicator is arranged on the bottom side wall of the second expansion cone.

7. A hanger packer tie-back housing for wellbore reconstruction according to claim 6, characterized in that, The expansion indicator is a pressure sensing device for real-time feedback of the expansion state of the hanging packer.

8. A hanging packer tie-back housing for wellbore reconstruction according to claim 1, characterized in that, Threads are arranged on the side wall of the feeding pipe, and the first expansion cone is threadedly connected to the feeding pipe.

Images