Packing type tie-back releasing device for tail pipe emergency remedy

Abstract

The invention provides a packing type tie-back releasing device for tail pipe emergency remedy, which comprises a packing type tie-back releasing device and a packer, and the packer realizes expansion sealing under the action of drilling tool pressure and is fixed on a casing pipe in a sealing manner; at the beginning, the feeding device is connected with the packing type tie-back releasing device, and the packing type tie-back releasing device is fed into a well through a feeding drilling tool; after the feeding tool feeds the packing type tie-back releasing device into a well and is connected with a hanger, expansion sealing of a packer is achieved through downward pressing of the weight of a drilling tool, the packer is fixed to a casing pipe, an annular space between the hanger and the upper-layer casing pipe is sealed, and tail pipe emergency remedy is achieved. And then the feeding tool is separated from the packing type tie-back releasing device.

Description

Technical Field

[0001] The invention relates to a sealing type tie-back releasing device for emergency remediation of a tail pipe, belonging to the technical field of fixing tools. Background Art

[0002] Liner cementing is a cementing technology that uses a liner hanger to connect the liner string, inserts a drill bit to place the liner hanger and the liner string to the designed position, and then performs cementing. It is an important process in oil drilling engineering. During the liner cementing operation, due to the small gap between the hanger and the upper casing overlap section, well leakage is prone to occur, resulting in poor cement sealing of the hanger and the upper casing overlap section, causing annular air leakage, which brings great risks to the subsequent well construction operations. In order to solve the annular air leakage, it is usually necessary to increase the remedial work of tieback cementing or short tieback cementing. Not only is the process complicated and the operation risk is high, but it also changes the drilling design, reduces the efficiency of the subsequent drilling operation, and increases the cost of well construction. Summary of the invention

[0003] In view of the above-mentioned technical problems existing in the prior art, the present invention proposes a tail pipe emergency rescue isolation type tie-back releasing device, which adopts a matching isolation type tie-back releasing device and cooperates with a special delivery device. The isolation type tie-back releasing device is delivered and inserted into the hanger tie-back tube by sending the drill bit, and the weight of the drill bit is used to press down to realize the expansion of the packer and the anchoring of the anti-retreat slip, so as to seal the annulus between the hanger and the upper casing and solve the problem of air leakage in the annulus.

[0004] On the other hand, the packer-type tie-back release device for emergency remediation of the pipe of the present invention releases the hand by means of a forward mechanical reverse buckle, directly pulling out the delivery drilling tool and the delivery device, facilitating the subsequent operation. This method only requires one trip of the packer-type tie-back release device, and utilizes the seal between the tie-back plug and the tie-back barrel and the seal between the packer and the annular space to complete the tail pipe emergency remediation measures, solve the annular air channeling problem, and does not require tie-back cementing or short tie-back cementing operations, effectively improving the drilling operation efficiency and reducing the construction risk and operation cost.

[0005] The present invention proposes a tail pipe emergency rescue isolation type tie-back release device, comprising: The packer type tie-back device comprises a packer, which is expanded and sealed on the casing under the action of drilling tool pressure; and A delivery device, which is initially connected to the packer tie-back release device and is delivered into the well by a drilling tool; Among them, when the running tool sends the isolation type tie-back release device into the well and connects it with the hanger, the packer is expanded and fixed on the casing by pressing down with the weight of the drilling tool, sealing the annulus between the hanger and the upper casing, and realizing emergency remediation of the tail pipe; then the running tool is separated from the isolation type tie-back release device.

[0006] A further improvement of the present invention is that a back-connection joint matching with the first back-connection barrel of the hanger is provided at the lower end of the packer.

[0007] A further improvement of the present invention is that a guide head is provided at the lower end of the return connector.

[0008] A further improvement of the present invention is that a sealing shell is provided at the upper end of the packer.

[0009] A further improvement of the present invention is that the upper end of the sealing shell is provided with the second tie-back tube, and the second tie-back tube can provide a channel for emergency remediation of the secondary tail pipe, or tie-back, short tie-back cementing emergency remediation measures; Among them, when secondary tail pipe emergency remediation, or tieback, short tieback cementing emergency remedial measures are needed, another level of the packer type tieback release device is added to the second tieback tube at the upper end of the original packer type tieback release device and is sealed and connected to the casing.

[0010] A further improvement of the present invention is that an anti-retraction slip is provided at the upper end of the packer.

[0011] A further improvement of the present invention is that the running tool is provided with an undercut device, and the interior of the packer-type tie-back device is provided with an internal thread; When the running tool is connected to the packer tie-back releasing device, the undercut device is connected to the internal thread; when the running tool is separated from the packer tie-back releasing device, the undercut device is separated from the internal thread by reversing the drilling tool to achieve release.

[0012] A further improvement of the present invention is that the running tool further comprises a central tube, a double female coupling is arranged at the lower end of the central tube, and a sealing core is arranged at the upper end of the central tube.

[0013] A further improvement of the present invention is that a sand-proof cap is provided on the upper portion of the running tool.

[0014] A further improvement of the present invention is that a lifting nipple is provided at the upper end of the running tool, and the running tool is connected to the drilling tool via the lifting nipple.

[0015] Compared with the prior art, the advantages of the present invention are: The packer-type tie-back releasing device for emergency rescue of the tail pipe according to the present invention adopts a matching packer-type tie-back releasing device in cooperation with a special delivery device, and the packer-type tie-back releasing device is delivered and inserted into the interior of the hanger tie-back tube by delivering the drilling tool, and the weight of the drilling tool is used to press down to achieve the expansion and sealing of the packer and the anchoring of the anti-retreat slip, thereby sealing the annulus between the hanger and the upper casing and solving the problem of air leakage in the annulus.

[0016] According to the packer-type tie-back release device for emergency remedy of the tail pipe of the present invention, the packer-type tie-back release device for emergency remedy of the tail pipe releases the hand by means of a forward mechanical reverse buckle, directly pulls out the delivery drilling tool and the delivery device, and facilitates the subsequent operation. This method only requires one trip of the packer-type tie-back release device, and utilizes the seal between the tie-back plug and the tie-back barrel and the seal between the packer and the annular space to complete the emergency remedy measures for the tail pipe, solve the problem of air leakage in the annular space, and does not require tie-back cementing or short tie-back cementing operations, which effectively improves the drilling operation efficiency and reduces the construction risk and operation cost.

[0017] The isolation type tie-back release device for emergency remediation of the tail pipe described in the present invention can effectively avoid the construction risks of tie-back cementing or short tie-back cementing operations due to emergency remediation of the tail pipe, and can quickly realize the emergency remediation of air leakage in the tail pipe cementing ring, thereby improving the drilling operation efficiency and reducing the construction risk and operation cost.

[0018] The packer-type tie-back releasing device and method for emergency remediation of the tail pipe proposed in the present invention are simple, and do not require additional tie-back cementing or short tie-back cementing operations for remediation. The delivery drill bit is connected to the packer-type tie-back releasing device, delivered and inserted into the interior of the hanger tie-back tube, and 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-retreat slip, thereby sealing the annulus between the hanger and the upper casing and solving the problem of air leakage in the annulus. The delivery drill bit and the delivery device are directly pulled out by means of a forward mechanical inverted buckle, thereby facilitating subsequent operations. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, in which: Figure 1 It is a schematic structural diagram of a packer-type tie-back device according to an embodiment of the present invention; Figure 2 Shown is a schematic structural diagram of a delivery device according to an embodiment of the present invention; The drawings are not drawn to scale.

[0020] The meanings of the reference numerals in the accompanying drawings are as follows: 10. Packer-type tie-back release device, 11. Tie-back tube, 12. Sealing shell, 13. Anti-retraction slip, 14. Packer, 15. Tie-back plug, 16. Guide head, 20. Delivery device, 21. Pull-up nipple, 22. Sand control cap, 23. Inverted buckle device, 24. Sealing core, 25. Center pipe, 26. Double female coupling. DETAILED DESCRIPTION

[0021] In order to make the technical solutions and advantages of the present invention more clearly understood, the exemplary embodiments of the present invention are further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than an exhaustive list of all the embodiments. In addition, the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

[0022] Liner cementing is a cementing technology that uses a liner hanger to connect the liner string, inserts a drill bit to place the liner hanger and the liner string to the designed position, and then performs cementing. It is an important process in oil drilling engineering. During the liner cementing operation, due to the small gap between the hanger and the upper casing overlap section, well leakage is prone to occur, resulting in poor cement sealing of the hanger and the upper casing overlap section, causing annular air leakage, which brings great risks to the subsequent well construction operations. In order to solve the annular air leakage, it is usually necessary to increase the remedial work of tieback cementing or short tieback cementing. Not only is the process complicated and the operation risk is high, but it also changes the drilling design, reduces the efficiency of the subsequent drilling operation, and increases the cost of well construction.

[0023] In order to solve the above problems, the present invention proposes a tail pipe emergency rescue isolation type tie-back releasing device, which adopts a matching isolation type tie-back releasing device and cooperates with a special delivery device. The isolation type tie-back releasing device is delivered and inserted into the hanger tie-back tube by sending the drill bit, and the weight of the drill bit is used to press down to realize the expansion of the packer and the anchoring of the anti-retreat slip, so as to seal the annulus between the hanger and the upper casing and solve the problem of air leakage in the annulus.

[0024] In such Figure 1 In the embodiment shown, a tail pipe emergency rescue isolation type tie-back release device includes: The packer type tie-back device 10 comprises a packer 14, wherein the packer 14 is expanded and sealed to the casing under the action of the drilling tool pressure; A delivery device 20, which is initially connected to the packer tie-back release device 10, and delivers the packer tie-back release device 10 into the well by delivering a drilling tool; Among them, when the running tool sends the isolation type tie-back release device 10 into the well and connects it with the hanger, the packer 14 is expanded and fixed on the casing by pressing down with the weight of the drilling tool, sealing the annulus between the hanger and the upper casing, and the tail pipe is urgently remedied; then the running tool is separated from the isolation type tie-back release device 10.

[0025] When using the packer tie-back release device for emergency rescue of the tail pipe according to the present embodiment, the running tool is connected to the lower end of the running drill bit, and the running device 20 is connected to the packer tie-back release device 10. Then, the packer tie-back release device 10 is sent into the well through the drilling bit and the running tool, and the packer tie-back release device 10 is connected to the hanger.

[0026] Afterwards, the gravity of the drilling tool presses down, thereby applying pressure to the packer tie-back release device 10, driving the packer 14 to expand and anchor on the casing, so that a seal is formed between the packer 14 and the casing above the hanger, thereby achieving emergency remediation.

[0027] After the emergency remedy is completed, the drill bit and the delivery device 20 are directly removed by releasing the hand through the forward mechanical reverse buckle mode, so as to facilitate the subsequent operation.

[0028] In one embodiment, a back-connection joint 15 is provided at the lower end of the packer 14. The back-connection joint 15 can be plugged into the hanger. A first back-connection tube 11 is provided at the upper end of the hanger. When the packer back-connection device 10 is lowered into the well, the back-connection joint can be plugged into the first back-connection tube, and a sealed connection is formed between the packer 14 and the hanger.

[0029] Preferably, a guide head 16 is provided at the lower end of the return connector 15 .

[0030] The guide head 16 plays a guiding role, ensuring that the packer tie-back release device 10 can smoothly enter the tie-back tube 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 a chamfered surface, ensuring that it can be smoothly connected to the tie-back tube 11.

[0031] In the packer tie-back and release device for emergency rescue of the tail pipe according to the present embodiment, a plug-back joint 15 and a guide head 16 are provided at the lower part of the packer tie-back and release device 10, which are arranged below the packer 14. The plug-back joint 15 and the guide head 16 can ensure that the packer tie-back and release device 10 is smoothly connected to the hanger.

[0032] According to the tail pipe emergency rescue isolation type tie-back releasing device described in the embodiment, a matching isolation type tie-back releasing device 10 is adopted, and a special delivery device 20 is cooperated. The isolation type tie-back releasing device 10 is delivered and inserted into the hanger tie-back tube 11 by delivering the drilling tool, and the weight of the drilling tool is used to press down to achieve the expansion and sealing of the packer 14 and the anchoring of the anti-retreat slip 13, so as to seal the annulus between the hanger and the upper casing and solve the problem of air leakage in the annulus.

[0033] According to the packer-type tie-back release device for emergency remediation of the tail pipe described in the embodiment, the packer-type tie-back release device 10 for emergency remediation of the pipe is released by a forward mechanical reverse buckle method, and the delivery drilling tool and the delivery device 20 are directly pulled out, which is convenient for subsequent operations. This method only requires one trip of the packer-type tie-back release device 10, and utilizes the seal between the tie-back plug and the tie-back tube 11 and the seal between the packer 14 and the annular space to complete the tail pipe emergency remediation measures, solve the annular air channeling problem, and do not need to use tie-back cementing or short tie-back cementing operations, which effectively improves the drilling operation efficiency and reduces the construction risk and operation cost.

[0034] In one embodiment, a sealing shell 12 is provided at the upper end of the packer 14. The sealing shell 12 is a cylindrical structure. A second tie-back tube 11 is provided at the upper end of the sealing shell 12. The structure of the second tie-back tube 11 is the same or similar to the first tie-back tube 11 at the upper end of the hanger.

[0035] In the packer type tie-back release device for emergency remedy of the liner according to this embodiment, the upper part of the packer 14 is provided with a sealing shell 12 and a second tie-back tube 11, which can protect the internal release mechanism. At the same time, the second tie-back tube 11 can provide a channel for emergency tie-back remediation of the secondary liner, or tie-back, short tie-back cementing emergency remediation measures.

[0036] When tieback remediation, or tieback or short tieback cementing emergency remediation is needed, another packer tieback release device 10 can be lowered into the well again by running the tool and the drilling tool, and an upper-level packer tieback release device 10 is formed at the upper end of the original packer tieback release device 10. The plug-in connector 15 and the guide head 16 of the upper-level packer tieback release device 10 are connected to the tieback tube 11 of the original packer tieback release device 10, and pressure is applied through the drilling tool again to expand and seal the packer 14 of the packer tieback release device 10, and add a layer of sealing between the packer and the casing, thereby realizing secondary tieback remediation.

[0037] In the present invention, due to the provision of the second tie-back tube 11, unlimited levels of emergency tie-back remediation can be achieved in theory. Usually, when a first-level sealing tie-back release device for tail pipe emergency remediation of this embodiment is used, most emergency remediation can be achieved.

[0038] In one embodiment, an anti-retreat slip valve 13 is provided at the upper end of the packer 14. When the packer 14 expands and seals under the action of pressure, the anti-retreat slip valve 13 can be stuck on the casing. The anti-retreat slip valve 13 also moves axially to a certain extent during the expansion of the packer 14, thereby jamming the packer 14 and preventing the packer 14 from retreating to its original state, so that it maintains the expanded and sealed state.

[0039] According to the device described in this embodiment, the weight of the drill bit is pressed down to achieve the expansion and sealing of the packer 14 and the anchoring of the anti-retreat slip 13, so that the annulus between the hanger and the upper casing can be sealed, thereby completing the tail pipe emergency remedial measures and solving the annular air leakage problem.

[0040] In one embodiment, the running tool is provided with an undercut device 23, and the undercut device 23 is arranged in the middle of the running tool; the interior of the packer tie-back device 10 is provided with an internal thread, and the internal thread can be connected with the thread of the undercut device 23; When the running tool is connected to the packer tie-back releasing device 10, the undercut device 23 is connected to the internal thread; when the running tool is separated from the packer tie-back releasing device 10, the undercut device 23 is separated from the thread by reversing the drilling tool to achieve release.

[0041] When using the packer tie-back release device for emergency rescue of the liner according to this embodiment, the running tool and the packer tie-back release device 10 are first connected to each other through the undercut device 23 and the internal thread. In the process of being lowered into the well by the drilling tool, the forward rotation will not separate the running tool from the packer tie-back release device 10. After the packer 14 is set, the internal thread and the undercut device 23 can be disengaged by rotating the drill bit forward, thereby completing the release.

[0042] In one embodiment, the running tool further comprises a central tube 25 , a double female coupling 26 is disposed at the lower end of the central tube 25 ; and a sealing core 24 is disposed at the upper end of the central tube 25 .

[0043] The sealing core 24 can form a seal with the interior of the pack-off tie-back device 10, and can achieve circulation during the lowering and trial insertion process.

[0044] In one embodiment, a sand-proof cap 22 is provided on the upper portion of the running tool to prevent foreign matter such as sand from entering the inner portion of the tie-back tube 11 .

[0045] In a preferred embodiment, a lifting subsection 21 is provided at the upper end of the running tool, and the running tool is connected to the drilling tool via the lifting subsection 21 .

[0046] The isolation type tie-back release device for emergency remediation of the tail pipe according to the embodiment can effectively avoid the construction risk of tie-back cementing or short tie-back cementing operation due to emergency remediation of the tail pipe, and can quickly realize the emergency remediation of air leakage in the tail pipe cementing ring, thereby improving the drilling operation efficiency and reducing the construction risk and operation cost.

[0047] According to the embodiment, the isolation type tie-back releasing device and method for emergency remediation of the tail pipe are simple, and there is no need to add tie-back cementing or short tie-back cementing operations for remediation. The delivery drill bit is connected to the isolation type tie-back releasing device 10, delivered and inserted into the hanger tie-back tube 11, and the weight of the drill bit is pressed down by the delivery drill bit to achieve the expansion and sealing of the packer 14 and the anchoring of the anti-retreat slip 13, thereby sealing the annulus between the hanger and the upper casing and solving the problem of air leakage in the annulus. The delivery drill bit and the delivery device 20 are directly pulled out by the forward mechanical inverted buckle method, which is convenient for subsequent operations.

[0048] Example 1 A tail pipe emergency rescue isolation type tie-back release device, comprising: The packer type tie-back device 10 comprises a packer 14, wherein the packer 14 is expanded and sealed to the casing under the action of the drilling tool pressure; A delivery device 20, which is initially connected to the packer tie-back release device 10, and delivers the packer tie-back release device 10 into the well by delivering a drilling tool; Among them, when the running tool sends the isolation type tie-back release device 10 into the well and connects it with the hanger, the packer 14 is expanded and fixed on the casing by pressing down with the weight of the drilling tool, sealing the annulus between the hanger and the upper casing, and the tail pipe is urgently remedied; then the running tool is separated from the isolation type tie-back release device 10.

[0049] The running tool is connected to the lower end of the running drill bit, and the running device 20 is connected to the packer tie-back release device 10, and then the packer tie-back release device 10 is sent into the well through the drilling bit and the running tool, and the packer tie-back release device 10 is connected to the hanger.

[0050] Afterwards, the gravity of the drilling tool presses down, thereby applying pressure to the packer tie-back release device 10, driving the packer 14 to expand and anchor on the casing, so that a seal is formed between the packer 14 and the casing above the hanger, thereby achieving emergency remediation.

[0051] After the emergency remedy is completed, the drill bit and the delivery device 20 are directly removed by releasing the hand through the forward mechanical reverse buckle mode, so as to facilitate the subsequent operation.

[0052] The lower end of the packer 14 is provided with a back-in joint 15, and the back-in joint 15 can be plugged into the hanger. The upper end of the hanger is provided with a first back-in joint 11. When the packer back-in joint device 10 is lowered into the well, the back-in joint can be plugged into the first back-in joint, and a sealed connection is formed between the packer 14 and the hanger.

[0053] A guide head 16 is provided at the lower end of the back-insertion connector 15 .

[0054] The guide head 16 plays a guiding role, ensuring that the packer tie-back release device 10 can smoothly enter the tie-back tube 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 a chamfered surface, ensuring that it can be smoothly connected to the tie-back tube 11.

[0055] A plug-in connector 15 and a guide head 16 are provided at the lower part of the packer type tie-back release device 10, which are arranged below the packer 14. The plug-in connector 15 and the guide head 16 can ensure that the packer type tie-back release device 10 is smoothly connected to the hanger.

[0056] The packer-type tie-back release device 10 for emergency remediation of the pipe releases the hand by means of forward mechanical reverse buckling, directly pulling out the delivery drilling tool and the delivery device 20, facilitating the subsequent operation. The method only requires one trip of the packer-type tie-back release device 10, and utilizes the seal between the tie-back plug and the tie-back tube 11 and the seal between the packer 14 and the annular space to complete the tail pipe emergency remediation measures, solve the annular air channeling problem, and do not need to use tie-back cementing or short tie-back cementing operations, effectively improving the drilling operation efficiency and reducing the construction risk and operation cost.

[0057] A sealing shell 12 is provided at the upper end of the packer 14. The sealing shell 12 is a cylindrical structure. A second tie-back tube 11 is provided at the upper end of the sealing shell 12. The structure of the second tie-back tube 11 is the same or similar to the first tie-back tube 11 at the upper end of the hanger.

[0058] The upper part of the packer 14 is provided with a sealing shell 12 and a second tie-back tube 11 to protect the internal release mechanism. At the same time, the second tie-back tube 11 can provide a channel for emergency tie-back remediation of the secondary tail pipe, or tie-back, short tie-back cementing emergency remediation measures.

[0059] When tieback remediation, or tieback or short tieback cementing emergency remediation is needed, another packer tieback release device 10 can be lowered into the well again by running the tool and the drilling tool, and an upper-level packer tieback release device 10 is formed at the upper end of the original packer tieback release device 10. The plug-in connector 15 and the guide head 16 of the upper-level packer tieback release device 10 are connected to the tieback tube 11 of the original packer tieback release device 10, and pressure is applied through the drilling tool again to expand and seal the packer 14 of the packer tieback release device 10, and add a layer of sealing between the packer and the casing, thereby realizing secondary tieback remediation.

[0060] In the present invention, due to the provision of the second tie-back tube 11, unlimited levels of emergency tie-back remediation can be achieved in theory. Usually, when a first-level sealing tie-back release device for tail pipe emergency remediation of this embodiment is used, most emergency remediation can be achieved.

[0061] An anti-retreat slip 13 is provided at the upper end of the packer 14. When the packer 14 expands and seals under the action of pressure, the anti-retreat slip 13 can be stuck on the casing. The anti-retreat slip 13 also moves axially to a certain extent during the expansion of the packer 14, thereby blocking the packer 14 and preventing the packer 14 from retreating to its original state, so that it remains in the expanded and sealed state.

[0062] The weight of the drill bit is pressed down to realize the expansion and sealing of the packer 14 and the anchoring of the anti-retraction slip 13, so that the annulus between the hanger and the upper casing can be sealed, thereby completing the tail pipe emergency remedial measures and solving the annular air leakage problem.

[0063] The running tool is provided with an undercut device 23, and the undercut device 23 is arranged in the middle of the running tool; the interior of the packer tie-back device 10 is provided with an internal thread, and the internal thread can be connected with the thread of the undercut device 23; When the running tool is connected to the packer tie-back releasing device 10, the undercut device 23 is connected to the internal thread; when the running tool is separated from the packer tie-back releasing device 10, the undercut device 23 is separated from the thread by reversing the drilling tool to achieve release.

[0064] First, the running tool and the packer type tie-back release device 10 are connected to each other through the undercut device 23 and the internal thread. When the drilling tool is lowered into the well, the forward rotation will not separate the running tool from the packer type tie-back release device 10. After the packer 14 is set, the internal thread and the undercut device 23 can be disengaged by rotating the drill bit forward, thereby completing the release.

[0065] The running tool further comprises a central tube 25 , a double female coupling 26 is disposed at the lower end of the central tube 25 ; a sealing core 24 is disposed at the upper end of the central tube 25 .

[0066] The sealing core 24 can form a seal with the interior of the pack-off tie-back device 10, and can achieve circulation during the lowering and trial insertion process.

[0067] A sand-proof cap 22 is provided on the upper portion of the running tool to prevent foreign matter such as sand from entering the interior of the return tube 11 .

[0068] A lifting nipple is provided at the upper end of the running tool, and the running tool is connected to the drilling tool via the lifting nipple.

[0069] It should be understood that the embodiments disclosed in the present invention are not limited to the specific structures, processing steps or materials disclosed herein, but should be extended to equivalent substitutions of these features understood by ordinary technicians in the relevant field. It should also be understood that the terms used herein are only used for the purpose of describing specific embodiments and are not meant to be limiting.

[0070] In the description of the present invention, unless otherwise specified, "plurality" means two or more than two; the orientations or positional relationships indicated by the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0071] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0072] Certain terms are used throughout this specification to refer to specific system components. As will be appreciated by those skilled in the art, different names may be used to refer to the same component, and thus this specification is not intended to distinguish between components that differ only in name and not in function. References to "one embodiment" or "an embodiment" in the specification mean that a particular feature, structure, or characteristic described in conjunction with the embodiment is included in at least one embodiment of the invention. Therefore, the phrases "one embodiment" or "an embodiment" appearing in various places throughout the specification do not necessarily all refer to the same embodiment.

[0073] The embodiments of the present invention are given for the purpose of illustration and description, and are not intended to be exhaustive or to limit the invention to the disclosed forms. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiments are selected and described in order to better illustrate the principles and practical applications of the present invention and to enable those of ordinary skill in the art to understand the present invention and thereby design various embodiments with various modifications suitable for specific uses.

[0074] Although the preferred embodiments of the present invention have been described, those skilled in the art may make additional changes and modifications to these embodiments once they are aware of the basic creative concepts. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and / or modifications that fall within the scope of the present invention, and changes and / or modifications made according to the embodiments of the present invention should be included within the scope of protection of the present invention.

Claims

1. A tail pipe emergency rescue isolation type tie-back device, characterized in that: include: A packer-type tie-back release device (10) comprises a packer (14), wherein the packer (14) is expanded and sealed and fixed on the casing under the action of drilling tool pressure; and A delivery device (20), wherein the delivery device (20) is initially connected to the packer type tie-back release device (10), and the packer type tie-back release device (10) is delivered into the well by delivering a drilling tool; When the running tool runs the packer-type tie-back release device (10) downhole and connects it to the hanger, the packer (14) is expanded and sealed by the weight of the drilling tool and fixed on the casing, thereby sealing the annulus between the hanger and the upper casing and realizing emergency repair of the tail pipe; thereafter, the running tool is separated from the packer-type tie-back release device (10).

2. The tail pipe emergency rescue isolation type tie-back release device according to claim 1, characterized in that: The lower end of the packer (14) is provided with a plug-back joint (15) that matches the first plug-back tube (11) of the hanger.

3. The tail pipe emergency rescue isolation type tie-back release device according to claim 2, characterized in that: A guide head (16) is provided at the lower end of the re-insertion connector (15).

4. The tail pipe emergency rescue isolation type tie-back release device according to claim 3, characterized in that: A sealing shell (12) is provided at the upper end of the packer (14).

5. The tail pipe emergency rescue isolation type tie-back release device according to claim 4, characterized in that: The upper end of the sealing shell (12) is provided with the second tie-back tube (11), and the second tie-back tube (11) can provide a channel for emergency remediation of the secondary tail pipe, or tie-back or short tie-back cementing emergency remediation measures; When a secondary tail pipe emergency remediation, or a tieback or short tieback cementing emergency remediation measure is required, an additional level of the packer type tieback release device (10) is added to the second tieback tube (11) at the upper end of the original packer type tieback release device (10) and is sealed and connected to the casing.

6. The tail pipe emergency rescue isolation type tie-back release device according to any one of claims 1 to 5, characterized in that: An anti-retraction slip (13) is provided at the upper end of the packer (14).

7. The tail pipe emergency rescue isolation type tie-back release device according to any one of claims 1 to 6, characterized in that: The running tool is provided with an undercut device (23), and the interior of the packer-type tie-back device (10) is provided with an internal thread; When the running tool is connected to the packer type tie-back releasing device (10), the undercut device (23) is connected to the internal thread; when the running tool is separated from the packer type tie-back releasing device (10), the undercut device (23) is separated from the internal thread by inverting the drilling tool, thereby achieving release.

8. The tail pipe emergency rescue isolation type tie-back device according to claim 7, characterized in that: The running tool further comprises a central tube (25), the lower end of which is provided with a double female coupling (26); and the upper end of the central tube (25) is provided with a sealing core (24).

9. The tail pipe emergency rescue isolation type tie-back release device according to claim 8, characterized in that: A sand prevention cap (22) is provided on the upper part of the running tool.

10. The tail pipe emergency rescue isolation type tie-back release device according to claim 9, characterized in that: A lifting nipple (21) is provided at the upper end of the running tool, and the running tool is connected to the drilling tool via the lifting nipple (21).

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