A packoff back-connection release device for emergency remedy of a tail pipe

Abstract

The application provides a packoff type back-connection and releasing device for emergency remedy of a tail pipe, which comprises a packoff type back-connection and releasing device, a packer, and a running device. The packer is sealed and fixed on a casing under the action of drilling tool pressure. The running device is connected with the packoff type back-connection and releasing device at the beginning and is used for running the packoff type back-connection and releasing device into a well. When the running device runs the packoff type back-connection and releasing device into the well and connects with a hanger, the packer is sealed and fixed on the casing by the weight of the drilling tool, the annulus between the hanger and the upper casing is sealed, and the emergency remedy of the tail pipe is realized. Then, the running device is separated from the packoff type back-connection and releasing device.

Description

Technical Field

[0001] This invention relates to a sealing-type reconnection and release device for emergency repair of tailpipes, belonging to the field of solidification tool technology. Background Technology

[0002] Tailtub cementing is a crucial step in oil drilling, involving connecting the tailtub string to a hanger using a drill string, placing the hanger and string to the designed position, and then cementing the well. During tailtub cementing, the small gap between the hanger and the upper casing makes leakage prone to occur, leading to incomplete cement sealing at the overlap and causing annular gas channeling, posing a significant risk to subsequent well construction operations. Resolving annular gas channeling typically requires additional or short-run cementing operations, which are not only complex and risky but also alter the drilling design, reduce subsequent drilling efficiency, and increase well construction costs. Summary of the Invention

[0003] To address the aforementioned technical problems in the existing technology, this invention proposes a packer-type reconnection release device for emergency repair of the tailpipe. This device, along with a dedicated feeding device, is fed into the hanger's reconnection sleeve using a drilling tool. The weight of the drilling tool applies downward pressure to achieve packer expansion and anchoring of the anti-reverse slips, sealing the annulus between the hanger and the upper casing, thus solving the problem of annular air leakage.

[0004] On the other hand, the packer-type reconnection release device for emergency repairs of the present invention releases the feed drill string and feed device directly through a forward-rotating mechanical reversal method, facilitating subsequent operations. This method only requires running the packer-type reconnection release device once, utilizing the seal between the reconnection plug and the reconnection sleeve and the seal between the packer and the annular space to complete the emergency repair measures for the tailpipe, solving the annular air leakage problem. It eliminates the need for reconnection cementing or short reconnection cementing operations, effectively improving drilling efficiency and reducing construction risks and operating costs.

[0005] This invention proposes a sealing-type reconnection and release device for emergency repair of tailpipes, comprising:

[0006] A packer-type reconnection release device includes a packer that expands and seals itself onto the casing under drill string pressure; and...

[0007] The feeding device is initially connected to the isolation type reconnection and release device, and the isolation type reconnection and release device is sent downhole through the feeding drill string;

[0008] When the delivery device sends the packer-type reconnection and release device downhole and connects it to the hanger, the weight of the drill string presses down to expand and seal the packer onto the casing, sealing the annulus between the hanger and the upper casing, thus achieving emergency repair of the tailpipe; afterwards, the delivery device separates from the packer-type reconnection and release device.

[0009] A further improvement of the present invention is that the lower end of the packer is provided with a return connector that mates with the first return sleeve of the hanger.

[0010] A further improvement of the present invention is that a guide head is provided at the lower end of the re-insertion connector.

[0011] A further improvement of the present invention is that a sealing shell is provided at the upper end of the packer.

[0012] A further improvement of the present invention is that the upper end of the sealing shell is provided with a second return tube, which can provide a channel for emergency repair of the secondary tailpipe, or emergency repair measures for reconnection or short reconnection cementing.

[0013] When a secondary tailpipe emergency repair or a reconnection or short reconnection cementing emergency repair measure is required, an additional sealing reconnection release device is added to the second reconnection cylinder at the upper end of the original sealing reconnection release device, and it is sealed and connected to the casing.

[0014] A further improvement of the present invention is that the upper end of the packer is provided with an anti-reverse slip.

[0015] A further improvement of the present invention is that the feeding device is provided with a buckle device, and the sealing type reconnection and release device is provided with an internal thread.

[0016] When the feeding device is connected to the sealing reconnection and release device, the reverse thread is connected to the internal thread; when the feeding device is separated from the sealing reconnection and release device, the reverse thread is separated from the internal thread by reversing the drill bit, thereby releasing the hand.

[0017] A further improvement of the present invention is that the feeding device further includes a central tube, the lower end of which is provided with a double female coupling; and the upper end of which is provided with a sealing core.

[0018] A further improvement of the present invention is that a sand-proof cap is provided on the upper part of the feeding device.

[0019] A further improvement of the present invention is that a lifting sub is provided at the upper end of the feeding device, and the feeding device is connected to the drill bit through the lifting sub.

[0020] Compared with the prior art, the advantages of the present invention are as follows:

[0021] The packer-type reconnection release device for emergency repair of the tailpipe according to the present invention uses a matching packer-type reconnection release device and a dedicated feeding device. The packer-type reconnection release device is fed into the hanger reconnection cylinder by the feeding drill bit. The weight of the drill bit is used to press down to achieve the expansion and sealing of the packer and the anchoring of the anti-reverse slip, sealing the annulus between the hanger and the upper casing and solving the problem of annular air leakage.

[0022] The liner emergency repair sealing reconnection release device of the present invention releases the feed drill string and feed device directly through a forward rotation mechanical reversal method, facilitating subsequent operations. This method requires only one run of the sealing reconnection release device, utilizing the seal between the reconnection plug and the reconnection sleeve, and the seal between the packer and the annular space, to complete the liner emergency repair, resolving the annular air leakage problem. It eliminates the need for reconnection cementing or short reconnection cementing operations, effectively improving drilling efficiency and reducing construction risks and operating costs.

[0023] The sealing-type reconnection and release device for emergency tailpipe repair described in this invention can effectively avoid the construction risks of reconnection cementing or short reconnection cementing operations due to emergency tailpipe repair, and can quickly realize emergency repair of annular air leakage in tailpipe cementing, thereby improving drilling operation efficiency and reducing construction risks and operating costs.

[0024] The packer-type reconnection release device and method for emergency tailpipe repair proposed in this invention are simple and do not require additional reconnection cementing or short reconnection cementing operations for repair. The packer-type reconnection release device is connected to the drill string, delivered, and inserted into the reconnection sleeve of the hanger. The weight of the drill string is used to press down and achieve the expansion and sealing of the packer and anchoring of the anti-reverse slips, sealing the annulus between the hanger and the upper casing and solving the problem of annular air leakage. The release is achieved by rotating the drill string forward and mechanically reversing, allowing the drill string and the delivery device to be retrieved directly, facilitating subsequent operations. Attached Figure Description

[0025] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, in which:

[0026] Figure 1 The diagram shown is a structural schematic of a sealed reconnection and release device according to an embodiment of the present invention.

[0027] Figure 2 The diagram shown is a structural schematic of a feeding device according to an embodiment of the present invention;

[0028] The accompanying drawings are not drawn to scale.

[0029] The meanings of the reference numerals in the attached figures are as follows:

[0030] 10. Enclosed reconnection release device; 11. Reconnection tube; 12. Sealed housing; 13. Anti-reverse slip; 14. Packer; 15. Reconnection plug; 16. Guide head; 20. Feeding device; 21. Lifting short section; 22. Sandproof cap; 23. Inverted device; 24. Sealing core; 25. Center tube; 26. Double female coupling. Detailed Implementation

[0031] To make the technical solutions and advantages of the present invention clearer, exemplary embodiments of the present invention will be described in further detail below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not an exhaustive list of all embodiments. Furthermore, without conflict, the embodiments and features in the embodiments of the present invention can be combined with each other.

[0032] Tailtub cementing is a crucial step in oil drilling, involving connecting the tailtub string to a hanger using a drill string, placing the hanger and string to the designed position, and then cementing the well. During tailtub cementing, the small gap between the hanger and the upper casing makes leakage prone to occur, leading to incomplete cement sealing at the overlap and causing annular gas channeling, posing a significant risk to subsequent well construction operations. Resolving annular gas channeling typically requires additional or short-run cementing operations, which are not only complex and risky but also alter the drilling design, reduce subsequent drilling efficiency, and increase well construction costs.

[0033] To address the aforementioned problems, this invention proposes a packer-type reconnection release device for emergency repair of the tailpipe. This device, along with a dedicated feeding device, is fed into the hanger's reconnection sleeve using a drilling tool. The weight of the drilling tool applies downward pressure to achieve packer expansion and anchoring of the anti-reverse slips, sealing the annulus between the hanger and the upper casing, thus resolving the annular air leakage problem.

[0034] In such Figure 1 In the illustrated embodiment, a sealing-type reconnection and release device for emergency tailpipe repair includes:

[0035] The packer-type reconnection and release device 10 includes a packer 14, which expands and seals the casing under the pressure of the drill string.

[0036] The feeding device 20 is initially connected to the isolation type reconnection and release device 10, and the isolation type reconnection and release device 10 is sent downhole through the feeding drill string;

[0037] When the feeding device sends the packer-type reconnection and release device 10 downhole and connects it to the hanger, the weight of the drill string presses down to expand and seal the packer 14 onto the casing, sealing the annulus between the hanger and the upper casing, and providing emergency relief for the tailpipe; then the feeding device separates from the packer-type reconnection and release device 10.

[0038] When using the liner emergency repair sealing reconnection release device according to this embodiment, the feeding device is connected to the lower end of the feeding drill string, and the feeding device 20 is connected to the sealing reconnection release device 10. Then, the sealing reconnection release device 10 is sent downhole through the drill string and the feeding device, and the sealing reconnection release device 10 is connected to the hanger.

[0039] Subsequently, the pressure is applied to the packer-type reconnection and release device 10 by the downward pressure of the drill string, which drives the packer 14 to expand and anchor on the casing. In this way, a seal is formed between the packer 14 and the casing above the hanger, thereby achieving emergency repair.

[0040] After completing the emergency repair, the drill string and feed device 20 are released by rotating the mechanically inverted mechanism to facilitate subsequent operations.

[0041] In one embodiment, the lower end of the packer 14 is provided with a back-connection connector 15, which can be inserted into the hanger. The upper end of the hanger is provided with a first back-connection tube. When the packer-type back-connection release device 10 is lowered into the well, the back-connection connector can be inserted into the first back-connection tube, and a sealed connection is formed between the packer 14 and the hanger.

[0042] Preferably, the lower end of the re-insertion connector 15 is provided with a guide head 16.

[0043] The guide head 16 serves as a guide, ensuring that the sealed reconnection release device 10 can smoothly enter the reconnection sleeve 11 of the hanger after being lowered into the well. In this embodiment, the end of the guide head 16 is an arc surface or is chamfered to ensure that it can smoothly connect with the reconnection sleeve 11.

[0044] In the emergency repair device for tailpipe according to this embodiment, the lower part of the sealing reconnection and release device 10 is provided with a reconnection connector 15 and a guide head 16, which are located below the packer 14. The reconnection connector 15 and the guide head 16 can ensure that the sealing reconnection and release device 10 can be smoothly connected to the hanger.

[0045] According to the embodiment, the emergency repair sealing reconnection device for the tailpipe uses a matching sealing reconnection device 10, which is used in conjunction with a dedicated feeding device 20. The sealing reconnection device 10 is fed into the hanger reconnection sleeve 11 by the feeding drill bit. The weight of the drill bit is used to press down to achieve the expansion and sealing of the packer 14 and the anchoring of the anti-reverse slip 13, sealing the annulus between the hanger and the upper casing and solving the problem of annular air leakage.

[0046] According to the embodiment, the packer-type reconnection release device 10 for emergency tailpipe repair involves releasing the device via a forward-rotating mechanical reversal, directly retrieving the feed drill string and feed device 20, facilitating subsequent operations. This method requires only one run of the packer-type reconnection release device 10, utilizing the seal between the reconnection plug and the reconnection sleeve 11, and the seal between the packer 14 and the annular space, to complete the tailpipe emergency repair measures, resolving the annular air leakage problem. It eliminates the need for reconnection cementing or short reconnection cementing operations, effectively improving drilling efficiency and reducing construction risks and operating costs.

[0047] In one embodiment, the upper end of the packer 14 is provided with a sealing shell 12, the sealing shell 12 has a cylindrical structure, and the upper end of the sealing shell 12 is provided with a second return tube 11, the second return tube 11 having the same or similar structure as the first return tube at the upper end of the hanger.

[0048] In the packer-type reconnection and release device for emergency tailpipe repair according to this embodiment, the packer 14 is equipped with a sealing shell 12 and a second reconnection cylinder 11 on its upper part, which can protect the internal release mechanism. At the same time, the second reconnection cylinder 11 can provide a channel for secondary tailpipe emergency reconnection repair, or reconnection and short reconnection cementing emergency repair measures.

[0049] When reconnection is needed for repair, or for emergency repair of reconnection or short reconnection cementing, another packer-type reconnection release device 10 can be lowered into the well through the delivery device and the delivery drill string. This forms a higher-level packer-type reconnection release device 10 above the original packer-type reconnection release device 10. The reconnection connector 15 and guide head 16 of the higher-level packer-type reconnection release device 10 are connected to the reconnection sleeve 11 of the original packer-type reconnection release device 10. Pressure is applied again through the drill string to cause the packer 14 of the packer-type reconnection release device 10 to expand and seal, adding a layer of seal between it and the casing, thereby achieving secondary reconnection repair.

[0050] In this invention, due to the provision of the second reconnection tube 11, it is theoretically possible to achieve an unlimited number of emergency reconnection repairs. Typically, when using the first-level tailpipe emergency repair sealing reconnection release device of this embodiment, most emergency repairs can be achieved.

[0051] In one embodiment, the upper end of the packer 14 is provided with an anti-reverse slip 13. When the packer 14 expands under pressure, the anti-reverse slip 13 can be locked onto the sleeve. The anti-reverse slip 13 also moves axially to a certain extent during the expansion of the packer 14, thereby locking the packer 14 and preventing the packer 14 from returning to its original state, thus keeping it in the expanded state.

[0052] According to the device described in this embodiment, the packer 14 expands and seals and the anti-reverse slip 13 is anchored under the weight of the drill string. This seals the annulus between the hanger and the upper casing, thereby completing the emergency rescue measures for the tailpipe and solving the problem of annular air leakage.

[0053] In one embodiment, the feeding device is provided with a buckle device 23, which is located in the middle of the feeding device; the sealing type reconnection and release device 10 is provided with an internal thread, which can be connected with the thread of the buckle device 23.

[0054] When the feeding device is connected to the sealing reconnection and release device 10, the reverse buckling device 23 is connected to the internal thread; when the feeding device is separated from the sealing reconnection and release device 10, the reverse buckling device 23 is separated from the thread by reversing the drill bit, thereby releasing the hand.

[0055] When using the sealing type reconnection and release device for emergency tailpipe repair according to this embodiment, the feeding device and the sealing type reconnection and release device 10 are first connected by the reverse buckle device 23 to the internal thread. During the process of lowering the drill string into the well, the forward rotation will not cause the feeding device to separate from the sealing type reconnection and release device 10.

[0056] After the packer 14 is set, the internal thread can be disengaged from the reverse thread device 23 by rotating the drill bit forward, thus completing the release.

[0057] In one embodiment, the feeding device further includes a central tube 25, the lower end of which is provided with a double female coupling 26; and the upper end of which is provided with a sealing core 24.

[0058] The sealing core 24 can form a seal with the interior of the enclosed reconnection and release device 10, enabling circulation during insertion and trial insertion.

[0059] In one embodiment, the upper part of the feeding device is provided with a sandproof cap 22, which can prevent sand and other foreign objects from entering the inside of the return cylinder 11.

[0060] In a preferred embodiment, the upper end of the feeding device is provided with a lifting sub 21, and the feeding device is connected to the drill bit through the lifting sub 21.

[0061] The sealing-type reconnection and release device for emergency tailpipe repair according to the embodiment can effectively avoid the construction risks of reconnection cementing or short reconnection cementing operations due to emergency tailpipe repair, and can quickly realize emergency repair of annular air leakage in tailpipe cementing, thereby improving drilling operation efficiency and reducing construction risks and operating costs.

[0062] According to the embodiment, the packer-type reconnection release device and method for emergency repair of the tailpipe are simple and do not require additional reconnection cementing or short reconnection cementing operations for repair. The packer-type reconnection release device 10 is connected to the drill string and inserted into the reconnection sleeve 11 of the hanger. The weight of the drill string is used to press down to achieve the expansion and sealing of the packer 14 and the anchoring of the anti-reverse slip 13, sealing the annulus between the hanger and the upper casing and solving the problem of annular air leakage. The release is achieved by rotating the drill string in a forward and reversing manner, and the drill string and the feed device 20 are directly retrieved, which facilitates subsequent operations.

[0063] Example 1

[0064] A sealing-type reconnection and release device for emergency tailpipe repair includes:

[0065] The packer-type reconnection and release device 10 includes a packer 14, which expands and seals the casing under the pressure of the drill string.

[0066] The feeding device 20 is initially connected to the isolation type reconnection and release device 10, and the isolation type reconnection and release device 10 is sent downhole through the feeding drill string;

[0067] When the feeding device sends the packer-type reconnection and release device 10 downhole and connects it to the hanger, the weight of the drill string presses down to expand and seal the packer 14 onto the casing, sealing the annulus between the hanger and the upper casing, and providing emergency relief for the tailpipe; then the feeding device separates from the packer-type reconnection and release device 10.

[0068] The feeding device is connected to the lower end of the feeding drill string, and the feeding device 20 is connected to the isolation type return release device 10. Then, the isolation type return release device 10 is sent downhole through the drill string and the feeding device, and the isolation type return release device 10 is connected to the hanger.

[0069] Subsequently, the pressure is applied to the packer-type reconnection and release device 10 by the downward pressure of the drill string, which drives the packer 14 to expand and anchor on the casing. In this way, a seal is formed between the packer 14 and the casing above the hanger, thereby achieving emergency repair.

[0070] After completing the emergency repair, the drill string and feed device 20 are released by rotating the mechanically inverted mechanism to facilitate subsequent operations.

[0071] The packer 14 is provided with a back-connector 15 at its lower end. The back-connector 15 can be inserted into the hanger. The hanger is provided with a first back-connection tube 11 at its upper end. When the packer-type back-connection release device 10 is lowered into the well, the back-connector can be inserted into the first back-connection tube, and a sealed connection is formed between the packer 14 and the hanger.

[0072] The lower end of the re-insertion connector 15 is provided with a guide head 16.

[0073] The guide head 16 serves as a guide, ensuring that the sealed reconnection release device 10 can smoothly enter the reconnection sleeve 11 of the hanger after being lowered into the well. In this embodiment, the end of the guide head 16 is an arc surface or is chamfered to ensure that it can smoothly connect with the reconnection sleeve 11.

[0074] The lower part of the packer-type reconnection and release device 10 is provided with a reconnection connector 15 and a guide head 16, which are located below the packer 14. The reconnection connector 15 and the guide head 16 can ensure that the packer-type reconnection and release device 10 can be smoothly connected to the hanger.

[0075] The packer-type reconnection release device 10 for emergency repairs releases the feed drill string and feed device 20 directly through a forward-rotation mechanical reversal method, facilitating subsequent operations. This method requires only one run of the packer-type reconnection release device 10, utilizing the seal between the reconnection plug and the reconnection sleeve 11 and the seal between the packer 14 and the annular space to complete the emergency repair measures for the tailpipe, solving the annular air leakage problem. It eliminates the need for reconnection cementing or short reconnection cementing operations, effectively improving drilling efficiency and reducing construction risks and operating costs.

[0076] The upper end of the packer 14 is provided with a sealing shell 12, which is a cylindrical structure. The upper end of the sealing shell 12 is provided with a second return tube 11, which has the same or similar structure as the first return tube 11 at the upper end of the hanger.

[0077] The packer 14 is equipped with a sealing shell 12 and a second return sleeve 11 on its upper part to protect the internal release mechanism. At the same time, the second return sleeve 11 can provide a channel for emergency return and repair of the secondary tailpipe, or for emergency repair measures such as return or short return cementing.

[0078] When reconnection is needed for repair, or for emergency repair of reconnection or short reconnection cementing, another packer-type reconnection release device 10 can be lowered into the well through the delivery device and the delivery drill string. This forms a higher-level packer-type reconnection release device 10 above the original packer-type reconnection release device 10. The reconnection connector 15 and guide head 16 of the higher-level packer-type reconnection release device 10 are connected to the reconnection sleeve 11 of the original packer-type reconnection release device 10. Pressure is applied again through the drill string to cause the packer 14 of the packer-type reconnection release device 10 to expand and seal, adding a layer of seal between it and the casing, thereby achieving secondary reconnection repair.

[0079] In this invention, due to the provision of the second reconnection tube 11, it is theoretically possible to achieve an unlimited number of emergency reconnection repairs. Typically, when using the first-level tailpipe emergency repair sealing reconnection release device of this embodiment, most emergency repairs can be achieved.

[0080] The upper end of the packer 14 is provided with an anti-reverse slip 13. When the packer 14 expands under pressure, the anti-reverse slip 13 can be locked onto the sleeve. The anti-reverse slip 13 also moves axially to a certain extent during the expansion of the packer 14, thereby locking the packer 14 and preventing the packer 14 from returning to its original state, thus keeping it in the expanded state.

[0081] The weight of the drill string presses down to expand and seal the packer 14 and anchor the anti-reverse slip 13, thus sealing the annulus between the hanger and the upper casing, thereby completing the emergency rescue measures for the tailpipe and solving the problem of annular air leakage.

[0082] The feeding device is provided with a buckling device 23, which is located in the middle of the feeding device; the sealing type reconnection and release device 10 is provided with an internal thread, which can be connected with the thread of the buckling device 23.

[0083] When the feeding device is connected to the sealing reconnection and release device 10, the reverse buckling device 23 is connected to the internal thread; when the feeding device is separated from the sealing reconnection and release device 10, the reverse buckling device 23 is separated from the thread by reversing the drill bit, thereby releasing the hand.

[0084] First, the feeding device and the sealing type return and release device 10 are connected by the reverse buckling device 23 to the internal thread. During the process of the drill string being lowered into the well, the forward rotation will not cause the feeding device to separate from the sealing type return and release device 10.

[0085] After the packer 14 is set, the internal thread can be disengaged from the reverse thread device 23 by rotating the drill bit forward, thus completing the release.

[0086] The feeding device also includes a central tube 25, the lower end of which is provided with a double female coupling 26; the upper end of the central tube 25 is provided with a sealing core 24.

[0087] The sealing core 24 can form a seal with the interior of the enclosed reconnection and release device 10, enabling circulation during insertion and trial insertion.

[0088] The upper part of the feeding device is provided with a sandproof cap 22, which can prevent sand and other foreign objects from entering the inside of the return cylinder 11.

[0089] The upper end of the feeding device is provided with a lifting sub, and the feeding device is connected to the drill bit through the lifting sub.

[0090] It should be understood that the embodiments disclosed herein are not limited to the specific structures, processing steps, or materials disclosed herein, but should be extended to equivalent substitutions of these features as understood by those skilled in the art. It should also be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting.

[0091] In the description of this invention, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," "tail," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0092] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0093] Certain terms are used throughout this application to refer to specific system components. As those skilled in the art will recognize, the same components may often be referred to by different names, and therefore this application is not intended to distinguish components that differ only in name and not in function. The terms "an embodiment" or "embodiment" used in the specification mean that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the invention. Therefore, the phrase "an embodiment" or "embodiment" appearing throughout the specification does not necessarily refer to the same embodiment.

[0094] The embodiments of the present invention are given for illustrative and descriptive purposes only, and are not intended to be exhaustive or to limit the invention to the forms disclosed. Many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described in order to better illustrate the principles and practical application of the invention, and to enable those skilled in the art to understand the invention and to design various embodiments with various modifications suitable for a particular purpose.

[0095] Although preferred embodiments of the invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and / or modifications falling within the scope of the invention, and all changes and / or modifications made according to embodiments of the invention should be covered within the protection scope of the invention.

Claims

1. A sealing-type reconnection and release device for emergency repair of tailpipes, characterized in that, include: A packer-type reconnection release device (10) includes a packer (14), which expands and seals itself onto the casing under drill string pressure; and The feeding device (20) is initially connected to the isolation type reconnection and release device (10) and the isolation type reconnection and release device (10) is sent downhole through the feeding drill string; When the feeding device sends the packer-type reconnection and release device (10) downhole and connects it to the hanger, the packer (14) is expanded and fixed on the casing by the weight of the drill string, sealing the annulus between the hanger and the upper casing, and realizing emergency repair of the tailpipe; then the feeding device separates from the packer-type reconnection and release device (10). The packer (14) is provided with a sealing shell (12) at its upper end. The upper end of the sealed outer shell (12) is provided with a second return tube (11), which can provide a channel for emergency repair of the secondary tailpipe, or emergency repair measures for reconnection or short reconnection cementing. When a secondary tailpipe emergency repair or a short-circuit cementing emergency repair measure is required, an additional sealing-type reconnection release device (10) is added to the second reconnection cylinder (11) at the upper end of the original sealing-type reconnection release device (10), and it is sealed and connected to the casing.

2. The sealing-type reconnection and release device for emergency repair of tailpipes according to claim 1, characterized in that, The lower end of the packer (14) is provided with a re-insertion connector (15) that mates with the first re-insertion tube of the hanger.

3. The sealing-type reconnection and release device for emergency repair of tailpipes according to claim 2, characterized in that, The lower end of the re-insertion connector (15) is provided with a guide head (16).

4. The sealing-type reconnection and release device for emergency repair of tailpipes according to claim 3, characterized in that, The upper end of the packer (14) is provided with an anti-reverse slip (13).

5. The sealing-type reconnection and release device for emergency repair of tailpipes according to claim 4, characterized in that, The feeding device is provided with a buckle device (23), and the sealing type reconnection and release device (10) is provided with an internal thread; When the feeding device is connected to the sealing type reconnection and release device (10), the reverse buckling device (23) is connected to the internal thread; when the feeding device is separated from the sealing type reconnection and release device (10), the reverse buckling device (23) is separated from the internal thread by reversing the drill bit, thereby realizing the release.

6. The sealing-type reconnection and release device for emergency repair of tailpipes according to claim 5, characterized in that, The feeding device also includes a central tube (25), the lower end of which is provided with a double female coupling (26); the upper end of the central tube (25) is provided with a sealing core (24).

7. The sealing-type reconnection and release device for emergency repair of tailpipes according to claim 6, characterized in that, The upper part of the feeding device is provided with a sandproof cap (22).

8. The sealing-type reconnection and release device for emergency repair of tailpipes according to claim 7, characterized in that, The upper end of the feeding device is provided with a lifting sub (21), and the feeding device is connected to the drill bit through the lifting sub (21).

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