Shaft repairing device and method

Abstract

The invention belongs to the technical field of shaft repairing, and particularly relates to a shaft repairing device and method. The shaft repairing device comprises an outer sleeve, a first conical surface is arranged on the inner wall of the outer sleeve, and a thread is arranged on the first conical surface; a third conical surface matched with the first conical surface is arranged on the outer wall of the first inner sleeve, and a thread is arranged on the third conical surface; the first inner sleeve is coaxially arranged in the outer sleeve, and the third conical surface is in threaded connection with the first conical surface; the outer sleeve is located at a leakage point of a shaft needing to be repaired, and after the first inner sleeve rotates relative to the outer sleeve, the first inner sleeve can extrude the outer sleeve outwards in the radial direction, so that the outer sleeve is expanded in the radial direction to abut against the inner wall of the shaft in a sealed mode, and repairing of the leakage point is completed.

Description

Technical Field

[0001] The present invention belongs to the technical field of wellbore repair, and in particular, relates to a wellbore repair device and a wellbore repair method. Background Art

[0002] The "production, storage, transportation, and use" of hydrogen are the four key links in promoting the development of the hydrogen energy industry. Among them, the "storage" link of hydrogen is the important link connecting the "production" and "use" of hydrogen. High-pressure gaseous hydrogen storage wells use steel casing to store high-pressure gaseous hydrogen. The storage body is located underground and has the advantages of small footprint, large storage capacity, and high safety performance. It can effectively promote the safe and efficient storage of hydrogen. Hydrogen molecules are small and require high sealing performance of storage containers. High-pressure gaseous hydrogen storage wells are composed of multiple wellbore casings connected together. The casings are mostly sealed with a single threaded connection, which is a risk point for hydrogen leakage.

[0003] With the large-scale construction and operation of hydrogen storage wells, adequate contingency plans and solutions for potential leaks are essential to ensure their safe and stable operation. Because the hydrogen storage wells are solidified underground, leaks are difficult to repair, and convenient and effective repair tools are currently lacking. Failure to promptly repair hydrogen storage wells often leads to their abandonment, resulting in a waste of resources and money.

[0004] Therefore, in response to the above problems, there is an urgent need to develop a convenient and effective hydrogen storage well repair device. Summary of the Invention

[0005] In response to the technical problems described above, the present invention aims to provide a wellbore repair device that can repair leakage points in hydrogen storage wells.

[0006] The present invention also proposes a wellbore repair method, which uses the wellbore repair device proposed in the present invention to repair the leakage point of the hydrogen storage well.

[0007] According to the present invention, a wellbore repair device is provided, comprising:

[0008] an outer sleeve, wherein a first conical surface is provided on an inner wall of the outer sleeve, and a thread is provided on the first conical surface;

[0009] a first inner sleeve, wherein a third conical surface matching the first conical surface is provided on an outer wall of the first inner sleeve, and a thread is provided on the third conical surface;

[0010] The first inner sleeve is coaxially arranged in the outer sleeve, and the third conical surface is connected to the first conical surface via a thread;

[0011] The outer casing is located at the leakage point of the wellbore that needs to be repaired. After the first inner casing rotates relative to the outer casing, the first inner casing can radially squeeze the outer casing outward, so that the outer casing radially expands to seal and abut against the inner wall of the wellbore, completing the repair of the leakage point.

[0012] In a specific embodiment, the wellbore repair device also includes a second inner casing, a fourth conical surface is provided on the outer wall of the second inner casing, a thread is provided on the fourth conical surface, the first conical surface is provided on the upper part of the inner wall of the outer casing, a second conical surface adapted to the fourth conical surface is provided on the lower part of the inner wall of the outer casing, a thread is provided on the second conical surface, and the fourth conical surface is connected to the second conical surface through the thread.

[0013] In a specific embodiment, the first conical surface and the second conical surface have opposite inclination directions.

[0014] In a specific embodiment, the first tapered surface and the second tapered surface are both configured to gradually decrease in inner diameter from the end portion to the middle of the outer sleeve.

[0015] In a specific embodiment, the wellbore repair device further includes an installation tool, and the installation tool is configured to drive the outer casing and the first inner casing to rotate relative to each other.

[0016] In a specific embodiment, the installation tool includes:

[0017] An installation sleeve, wherein a sleeve turntable is coaxially arranged at the lower end of the installation sleeve;

[0018] A mounting sleeve rod is coaxially arranged in the mounting sleeve, the lower end of the mounting sleeve rod extends out of the mounting sleeve, and a sleeve rod turntable is provided at the lower end of the mounting sleeve rod;

[0019] The sleeve turntable and the sleeve rod turntable are configured to be fixed to the outer sleeve and the first inner sleeve respectively, thereby driving the outer sleeve and the first inner sleeve to rotate relative to each other.

[0020] In a specific embodiment, at least one radially retractable sleeve pin is provided on the side of the sleeve turntable, at least one radially retractable sleeve rod pin is provided on the side of the sleeve rod turntable, and pin holes adapted to the sleeve pin and the sleeve rod pin are provided on the inner walls of the inner sleeve and the first inner sleeve.

[0021] In a specific embodiment, the installation sleeve rod is arranged in the installation sleeve by a threaded connection, and the thread pitch of the installation sleeve rod is equal to the thread pitch of the outer sleeve.

[0022] In a specific embodiment, the outer sleeve is made of metal material.

[0023] According to the present invention, a wellbore repair method is also provided, in which a leaking point in a wellbore is repaired using the wellbore repair device provided by the present invention.

[0024] Compared with the prior art, the advantages of this application are as follows.

[0025] The present invention primarily comprises an outer casing and a first inner casing coaxially nested within each other. The mechanical mechanism offers simplified on-site operation and high stability. The tapered surface between the first inner casing and the outer casing radially expands the outer casing until it seals against the inner wall of the wellbore, completing the wellbore repair. The wellbore repair device provided by the present invention leaves a small footprint within the well, virtually eliminating any impact on the hydrogen storage well capacity after repair.

[0026] The outer sleeve of the present invention, which seals against the inner wall of the wellbore, is made of metal, providing a more stable and durable seal than polymer materials such as rubber. This repair method significantly improves operational stability and service life, reducing the lifecycle cost of the hydrogen storage well. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The present invention will be described below with reference to the accompanying drawings.

[0028] Figure 1 A schematic diagram showing an embodiment of a wellbore repair device according to the present invention;

[0029] Figure 2 A schematic longitudinal section diagram of an outer casing of a wellbore repair device according to the present invention is shown;

[0030] Figure 3 A schematic transverse cross-sectional view of an outer casing of a wellbore repair device according to the present invention is shown;

[0031] Figure 4 A schematic longitudinal section diagram of a first inner casing and a second inner casing of a wellbore repair device according to the present invention is shown;

[0032] Figure 5 A schematic transverse cross-sectional view of a first inner casing of a wellbore repair device according to the present invention is shown;

[0033] Figure 6 A schematic diagram showing an installation tool for a wellbore repair device according to the present invention;

[0034] Figure 7 A schematic transverse cross-sectional view of a casing carousel of an installation tool according to the present invention is shown;

[0035] Figure 8A schematic transverse cross-sectional view of a rod turntable of an installation tool according to the present invention is shown;

[0036] Figure 9 A schematic diagram showing a wellbore repairing device according to the present invention;

[0037] Figure 10 A diagram showing the working principle of the sleeve pin according to the present invention is shown.

[0038] In the picture:

[0039] 1. Outer sleeve; 11. First conical surface; 12. Second conical surface; 13. First pin hole; 14. Connecting surface;

[0040] 2. First inner sleeve; 21. Third tapered surface; 22. Second pin hole;

[0041] 3. Second inner sleeve; 31. Fourth tapered surface; 32. Third pin hole;

[0042] 4. Installation tools; 41. Installation sleeve; 42. Casing turntable; 43. Casing pin; 44. Installation sleeve rod; 45. Casing rod turntable; 46. Casing rod pin; 47. Spring; 48. Steel cable; 49. Drive element; 40. Telescopic hole;

[0043] 5. Wellhead assembly; 6. Wellbore casing; 7. Casing thread connection; 8. Well bottom;

[0044] 100. Wellbore repair device.

[0045] In this application, all drawings are schematic drawings, which are only used to illustrate the principles of the present invention and are not drawn to scale. DETAILED DESCRIPTION

[0046] The present invention will be described below with reference to the accompanying drawings.

[0047] It should be noted that the directional terms or qualifiers "upper" and "lower" used in this application are all directed to the referenced Figure 1 In this context, "inside" refers to the direction close to the central axis of the wellbore repair device, and "outside" refers to the direction away from the central axis of the wellbore repair device. They are not intended to define the absolute positions of the components involved, but may vary according to specific circumstances.

[0048] Figure 1 FIG. 1 shows the structure of a wellbore repair device 100 according to the present invention. Figure 1 As shown, the wellbore repair device 100 includes an outer casing 1 and a first inner casing 2.

[0049] Among them, a first conical surface 11 is provided on the inner wall of the outer sleeve 1, and a thread is provided on the first conical surface 11. A third conical surface 21 is provided on the outer wall of the first inner sleeve 2, which is adapted to the first conical surface 11, and a thread is provided on the third conical surface 21. The first inner sleeve 2 is coaxially arranged in the outer sleeve 1 by a threaded connection, that is, the third conical surface 21 is connected to the first conical surface 11 by a thread. When the wellbore of the hydrogen storage well needs to be repaired, the coaxially connected outer sleeve 1 and the first inner sleeve 2 are first lowered into the leak point in the wellbore, and then the first inner sleeve 2 is rotated relative to the outer sleeve 1, so that the first inner sleeve 2 moves axially relative to the outer sleeve 1, and the end of the first inner sleeve 2 with a larger outer diameter gradually moves toward the outer sleeve 1, generating a radially outward squeezing force on the outer sleeve 1, thereby causing the outer sleeve 1 to expand radially until the outer wall of the outer sleeve 1 is sealed with the inner wall of the wellbore, completing the repair of the wellbore.

[0050] In a preferred embodiment, the wellbore repair device further comprises a second inner casing 3 , an outer wall of the second inner casing 3 is provided with a fourth conical surface 31 , and a thread is provided on the fourth conical surface 31 .

[0051] like Figures 1 to 5 As shown, the outer sleeve 1 is generally constructed in a circular shape, with a first tapered surface 11 and a second tapered surface 12 provided at the upper and lower portions of the inner wall of the outer sleeve 1, respectively. The first tapered surface 11 is provided with threads that mate with the threads on the third tapered surface 21 of the first inner sleeve 2. In other words, the inclination angle of the third tapered surface 21 of the first inner sleeve 2 is the same as the inclination angle of the first tapered surface 11 of the outer sleeve 1, and the threads of the third tapered surface 21 are compatible with the threads of the first tapered surface 11, with the two threads being connected to each other. The second tapered surface 12 is provided with threads that mate with the threads on the fourth tapered surface 31 of the second inner sleeve 3. In other words, the inclination angle of the fourth tapered surface 31 of the second inner sleeve 3 is the same as the inclination angle of the second tapered surface 12 of the outer sleeve 1, and the threads of the fourth tapered surface 31 are compatible with the threads of the second tapered surface 12, with the two threads being connected to each other.

[0052] In a preferred embodiment, the first conical surface 11 and the second conical surface 12 are inclined in opposite directions, and their inclination angles are the same. Through this arrangement, the outer sleeve 1 is constructed as a structure that is symmetrical in the upper and lower directions. Accordingly, the first inner sleeve 2 and the second inner sleeve 3 have the same structure, and the first inner sleeve 2 and the second inner sleeve 3 are symmetrically installed at the upper and lower ends of the outer sleeve 1. When repairing the wellbore, the first inner sleeve 2 rotates relative to the outer sleeve 1, causing the upper end of the outer sleeve 1 to expand radially outward. The second inner sleeve 3 rotates relative to the outer sleeve 1, causing the lower end of the outer sleeve 1 to expand radially outward. With this arrangement, the sealing of the wellbore leakage point can be strengthened.

[0053] In a preferred embodiment, the first conical surface 11 and the second conical surface 12 are both constructed so that the inner diameter gradually decreases from the end to the middle of the outer sleeve 1. In other words, the outer sleeve 1 is constructed as a structure that is thick in the middle and thin at both ends. Under this arrangement, on the one hand, the first inner sleeve 2 and the second inner sleeve 3 can be quickly assembled to the outer sleeve 1 and can also be quickly disassembled, making it easy to use. On the other hand, the thin thickness of the two ends of the outer sleeve 1 makes it easier for the two ends of the outer sleeve 1 to deform and expand radially to a sealed abutment with the inner wall of the wellbore when the first inner sleeve 2 and the second inner sleeve 3 squeeze the outer sleeve 1, thereby effectively sealing the leak point of the wellbore.

[0054] In a preferred embodiment, Figure 1 As shown, a connecting surface 14 is provided between the first tapered surface 11 and the second tapered surface 12 of the outer sleeve 1. When the first inner sleeve 2 and the second inner sleeve 3 move relative to the outer sleeve 1, both the first inner sleeve 2 and the second inner sleeve 3 can extend to the connecting surface 14. The provision of the connecting surface 14 provides sufficient displacement space for the first inner sleeve 2 and the second inner sleeve 3, thereby avoiding the problem of poor sealing caused by insufficient displacement of the first inner sleeve 2 and the second inner sleeve 3.

[0055] like Figures 6 to 8 As shown, the wellbore repair device further includes an installation tool 4 , which is configured to drive the outer casing 1 and the first inner casing 2 to rotate relative to each other.

[0056] In a specific embodiment, the installation tool 4 includes an installation sleeve 41 , a sleeve turntable 42 , an installation sleeve rod 44 and a sleeve rod turntable 45 .

[0057] The overall structure of the installation sleeve 41 is roughly in the shape of a circular tube, and the overall structure of the sleeve turntable 42 is roughly in the shape of a circular ring. The sleeve turntable 42 is coaxially fixed to the lower end of the installation sleeve 41.

[0058] The mounting sleeve rod 44 is generally constructed in a cylindrical rod shape, and the sleeve rod rotary disk 45 is generally constructed in a disc shape. The sleeve rod rotary disk 45 is coaxially fixed to the lower end of the mounting sleeve rod 44 .

[0059] The mounting rod 44 is coaxially disposed within the mounting sleeve 41 and is rotatable relative to the mounting sleeve 41. The lower end of the mounting rod 44 extends beyond the mounting sleeve 41; that is, the rod turntable 45 is located below the casing turntable 42. During wellbore repair, the casing turntable 42 and the rod turntable 45 are configured to be fixed to the outer sleeve 1 and the first inner sleeve 2, respectively. The mounting sleeve 41 rotates relative to the mounting rod 44, thereby driving relative rotation between the outer sleeve 1 and the first inner sleeve 2. This, in turn, causes the first inner sleeve 2 to move axially relative to the outer sleeve 1, causing the outer sleeve 1 to expand radially until the outer wall of the outer sleeve 1 is in sealed contact with the inner wall of the wellbore.

[0060] According to the present invention, in a specific embodiment, Figure 7 and Figure 8 As shown, at least one radially retractable sleeve pin 43 is provided on the side of the sleeve turntable 42, and at least one radially retractable sleeve rod pin 46 is provided on the side of the sleeve rod turntable 45. The sleeve pin 43 and the sleeve rod pin 46 are mechanically or hydraulically controlled. The outer diameters of the sleeve turntable 42 and the sleeve rod turntable 45 are slightly smaller than the inner diameters of the outer sleeve 1, the first inner sleeve 2, and the second inner sleeve 3.

[0061] In a specific embodiment, Figure 10 As shown, a driver 49 is fixedly mounted at the central axis of the sleeve turntable 42, with the output end of the driver 49 located within the sleeve turntable 42. A sleeve pin 43 is radially movable within the telescopic hole 40 of the sleeve turntable 42. A spring 47 is disposed between the sleeve pin 43 and the output shaft of the driver 46. One end of the spring 47 abuts the sleeve pin 43, and the other end abuts the end of the telescopic hole 40. A steel cable 48 is also disposed between the sleeve pin 43 and the output shaft of the driver 49. One end of the steel cable 48 is fixed to the output shaft of the driver 49, and the other end of the steel cable 48 passes through the spring and connects to the sleeve pin 43. In this arrangement, when the output end of the driver 49 rotates, it can be wound around the steel cable 48, thereby pulling the sleeve pin 43 radially contracting relative to the sleeve turntable 42. After the output shaft of the driving member 49 rotates in the opposite direction, the wound steel cable 48 can be released, and the sleeve pin 43 is reset under the action of the spring 47 , that is, the sleeve pin 43 extends radially relative to the sleeve turntable 42 .

[0062] It is easy to understand that the structure inside the sleeve rod rotary disk 45 for driving the sleeve rod pin 46 to radially extend and retract is the same as the structure inside the sleeve rotary disk 42. The difference is that the driving member 49 is arranged below the sleeve rod rotary disk 45 to avoid interference.

[0063] Furthermore, the driving member 49 can be configured to be completely buried inside the sleeve rod turntable 45 or the sleeve turntable 42, so that there is no need to worry about the driving member 49 interfering with other components.

[0064] like Figure 2 and Figure 3 As shown, a first pin hole 13 for adapting to the sleeve pin 43 or the sleeve rod pin 46 is provided on the inner wall of the outer sleeve 1, that is, when the sleeve pin 43 or the sleeve rod pin 46 extends radially outward, the sleeve pin 43 or the sleeve rod pin 46 can extend into the first pin hole 13, thereby being fixedly connected to the outer sleeve 1.

[0065] like Figure 4 and Figure 5As shown, a second pin hole 22 is provided on the inner wall of the first inner sleeve 2 for adapting to the sleeve pin 43 or the sleeve rod pin 46, that is, when the sleeve pin 43 or the sleeve rod pin 46 extends radially outward, the sleeve pin 43 or the sleeve rod pin 46 can extend into the second pin hole 22, thereby being fixedly connected to the first inner sleeve 2.

[0066] The structure of the second inner sleeve 3 is the same as that of the second inner sleeve 3. A third pin hole 32 is provided on the inner wall of the second inner sleeve 3 for adapting to the sleeve pin 43 or the sleeve rod pin 46. That is, when the sleeve pin 43 or the sleeve rod pin 46 extends radially outward, the sleeve pin 43 or the sleeve rod pin 46 can extend into the third pin hole 32, thereby being fixedly connected to the second inner sleeve 3.

[0067] In a specific embodiment, four sleeve pins 43 are evenly arranged along the circumference on the side of the sleeve rotary disk 42, and four sleeve rod pins 46 are evenly arranged along the circumference on the side of the sleeve rotary disk 45. Correspondingly, four first pin holes 13, two second pin holes 22, and three third pin holes 32 are also respectively provided.

[0068] In a preferred embodiment, the mounting sleeve rod 44 is threadedly disposed within the mounting sleeve 41, and the pitch of the thread on the mounting sleeve rod 44 is equal to the pitch of the thread on the outer sleeve 1. It should be noted that, in this application, the pitch of the thread on the mounting sleeve rod 44 is equal to the pitch of the thread on the outer sleeve 1 means that, at the same rotation angle, the distance axially moved by the mounting sleeve rod 44 relative to the mounting sleeve 41 is equal to the distance axially moved by the first inner sleeve 2 or the second inner sleeve 3 relative to the outer sleeve 1. In this arrangement, during the process of the first inner sleeve 2 or the second inner sleeve 3 being driven relative to the outer sleeve 1 by the mounting sleeve 44 and the mounting sleeve rod 41, the two remain synchronized.

[0069] According to the present invention, the outer sleeve 1 is made of metal. Furthermore, the outer sleeve 1, the first inner sleeve 2, and the second inner sleeve 3 are all made of metal materials that are resistant to hydrogen embrittlement, wherein the outer sleeve 1 is made of a material with good ductility, and the first inner sleeve 2 and the second inner sleeve 3 are made of a material with high hardness.

[0070] According to the present invention, a wellbore repair method is also provided, in which a leaking point in a wellbore is repaired using the wellbore repair device 100 provided according to the present invention.

[0071] Specifically, if Figure 9As shown, this embodiment repairs the leakage point of the hydrogen storage well. The hydrogen storage well is a high-pressure underground hydrogen storage device, which is connected by a plurality of steel wellbore casings 6 through a threaded connection. The wellbore casing 6 is made of steel material with hydrogen embrittlement resistance, such as 30Cr-Mo. The "wellbore inner wall" mentioned in the text refers to the inner wall of the wellbore casing 6. After the wellbore casing 6 is placed in the well, cementing is required. Therefore, the wellbore casing 6 cannot usually be disassembled and replaced after the construction of the hydrogen storage well is completed. In this embodiment, the inner diameter of the wellbore casing 6 is 340mm, and the wellbore casings 6 are connected by threads to form a hydrogen seal. Since hydrogen has a small molecular weight and a strong escape ability, as the hydrogen storage well is operated, the connection between adjacent wellbore casings 6 is prone to become a risk point for hydrogen leakage. Once hydrogen leaks, the wellbore repair device 100 can be lowered to seal and repair the leak point so that the hydrogen storage well can continue to operate safely.

[0072] After the wellbore casing 6 leaks, the wellbore repair device 100 is lowered into the well. The outer diameter of the outer sleeve 1 is slightly smaller than the inner diameter of the wellbore casing 6, for example, 330 mm. The outer sleeve 1 is made of a hydrogen embrittlement-resistant material with good ductility, such as copper and its alloys that are hydrogen embrittlement-resistant. The outer sleeve 1 is connected to the first inner sleeve 2 and the second inner sleeve 3 by threads. The first inner sleeve 2 and the second inner sleeve 3 are made of a hydrogen embrittlement-resistant material with high hardness, such as 30Cr-Mo. The threaded connection surface is a trapezoidal inclined surface. During the tightening process of the threads, the first inner sleeve 2 and the second inner sleeve 3 produce uniform radial extrusion on the outer sleeve 1, causing the outer sleeve 1 to expand slowly and evenly, increase its outer diameter, contact and press with the inner wall of the wellbore casing 6, and form a metal seal, thereby achieving the effect of hydrogen leakage repair. In addition, the degree of tightening of the inner and outer sleeves can be adjusted to adjust the degree of expansion of the outer sleeve 1, thereby adjusting the contact pressure between the outer sleeve 1 and the wellbore casing 6 of the hydrogen storage well to achieve the best sealing effect.

[0073] Copper and its alloy materials that are resistant to hydrogen embrittlement are well known to those skilled in the art and will not be described in detail here.

[0074] Before the wellbore repair device 100 is put into the well, the inner wall of the wellbore casing 6 at the leaking part of the hydrogen storage well is first cleaned and polished to prevent impurities from adhering to the surface and adversely affecting the subsequent sealing effect.

[0075] When the wellbore repair device 100 is inserted into the well, the first inner casing 2 and the second inner casing 3 are first screwed onto the outer casing 1 through threads, and then the outer casing 1 is sleeved on the outside of the casing turntable 42, so that the casing pin 43 of the casing turntable 42 is connected and fixed with the first pin hole 13 of the outer casing 1, and the sleeve rod pin 46 of the sleeve rod turntable 45 is extended and connected and fixed with the third pin hole 32 of the second inner casing 3. Then the outer casing 1 is lowered to the leakage position of the hydrogen storage well, the installation casing 41 is kept stationary, and the installation sleeve rod 44 is rotated to drive the sleeve rod turntable 45 to rotate, so that the second inner casing 3 is moved upward relative to the outer casing 1 through the threads. The second inner casing 3 generates a radial extrusion force on the outer casing 1, causing the outer casing 1 to expand and contact and press against the inner wall of the wellbore casing 6, generating sealing pressure, and finally the second inner casing 3 is buckled to the appropriate torque to form a hydrogen seal.

[0076] Then, the casing pin 43 and the sleeve rod pin 46 are retracted and disconnected from the outer sleeve 1 and the second inner sleeve 3. The casing turntable 42 and the sleeve rod turntable 45 are lifted to correspond to the first inner sleeve 2 and the outer sleeve 1 respectively. The first inner sleeve 2 is placed on the outside of the casing turntable 42, so that the casing pin 43 of the casing turntable 42 is connected and fixed with the second pin hole 22 of the first inner sleeve 2, and the sleeve rod pin 46 of the sleeve rod turntable 45 is extended and connected and fixed with the first pin hole 13 of the outer sleeve 1. The installation sleeve rod 44 is kept stationary, and the installation sleeve 41 is rotated, driving the casing turntable 42 to rotate, so that the first inner sleeve 2 moves downward relative to the outer sleeve 1 through the thread. The first inner sleeve 2 generates a radial extrusion force on the outer sleeve 1, causing the outer sleeve 1 to expand and contact and press against the inner wall of the wellbore casing 6, generating sealing pressure. Finally, the first inner sleeve 2 is buckled to the appropriate torque to form a hydrogen seal. Subsequently, the casing pin 43 and the casing rod pin 46 are retracted, and the installation tool 4 is lifted out to complete the repair of the hydrogen storage well leakage.

[0077] In the description of the present invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "plurality" means two or more, unless otherwise specifically defined.

[0078] In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connect," "fixed," etc. should be understood broadly. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary; or internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0079] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "examples," "specific examples," or "some examples" means that a specific feature, structure, material, or characteristic described in conjunction with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0080] Finally, it should be noted that the above description is merely a preferred embodiment of the present invention and does not constitute any limitation to the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to replace some of the technical features therein with equivalents. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the scope of protection of the present invention.

Claims

1. A wellbore repair device, characterized in that: include: An outer sleeve (1), wherein a first conical surface (11) is provided on the inner wall of the outer sleeve (1), and a thread is provided on the first conical surface (11); A first inner sleeve (2), wherein a third conical surface (21) adapted to the first conical surface (11) is provided on the outer wall of the first inner sleeve (2), and a thread is provided on the third conical surface (21); The first inner sleeve (2) is coaxially arranged in the outer sleeve (1), and the third conical surface (21) is connected to the first conical surface (11) via a thread; The outer casing is located at the leakage point of the wellbore that needs to be repaired. After the first inner casing rotates relative to the outer casing, the first inner casing can radially squeeze the outer casing outward, so that the outer casing radially expands to seal and abut against the inner wall of the wellbore, completing the repair of the leakage point.

2. The wellbore repair device according to claim 1, characterized in that: The wellbore repair device also includes a second inner casing (3), a fourth conical surface (31) is provided on the outer wall of the second inner casing (3), and a thread is provided on the fourth conical surface (31), the first conical surface (11) is provided on the upper part of the inner wall of the outer casing (1), and a second conical surface (12) adapted to the fourth conical surface (31) is provided on the lower part of the inner wall of the outer casing (1), and a thread is provided on the second conical surface (12), and the fourth conical surface (31) is connected to the second conical surface (12) through the thread.

3. The wellbore repair device according to claim 2, characterized in that: The first conical surface (11) and the second conical surface (12) have opposite inclination directions.

4. The wellbore repair device according to claim 3, characterized in that: The first tapered surface (11) and the second tapered surface (12) are both configured to gradually reduce the inner diameter from the end to the middle of the outer sleeve (1).

5. The wellbore repair device according to any one of claims 1 to 4, characterized in that: The wellbore repair device further comprises an installation tool (4), and the installation tool (4) is configured to drive the outer casing (1) and the first inner casing (2) to rotate relative to each other.

6. The wellbore repair device according to claim 5, characterized in that: The installation tool (4) comprises: A mounting sleeve (41), wherein a sleeve turntable (42) is coaxially arranged at the lower end of the mounting sleeve (41); A mounting sleeve rod (44) is coaxially arranged in the mounting sleeve (41), the lower end of the mounting sleeve rod (44) extends out of the mounting sleeve (41), and a sleeve rod rotating disk (45) is provided at the lower end of the mounting sleeve rod (44); The sleeve turntable (42) and the sleeve rod turntable (45) are configured to be fixed to the outer sleeve (1) and the first inner sleeve (2) respectively, thereby driving the outer sleeve (1) and the first inner sleeve (2) to rotate relative to each other.

7. The wellbore repair device according to claim 6, characterized in that: At least one radially retractable sleeve pin (43) is provided on the side of the sleeve turntable (42), at least one radially retractable sleeve rod pin (46) is provided on the side of the sleeve rod turntable (45), and pin holes adapted to the sleeve pin (43) and the sleeve rod pin (46) are provided on the inner walls of the outer sleeve (1) and the first inner sleeve (2).

8. The wellbore repair device according to claim 6, characterized in that: The mounting sleeve rod (44) is arranged in the mounting sleeve (41) in a threaded connection manner, and the thread pitch on the mounting sleeve rod (44) is equal to the thread pitch of the outer sleeve (1).

9. The wellbore repair device according to any one of claims 1 to 4, characterized in that: The outer sleeve (1) is made of metal material.

10. A wellbore repair method, characterized in that: The leaking point of the wellbore is repaired using the wellbore repair device according to any one of claims 1 to 9.

Images