A well tubing hanger recovery tool and a well tubing suspension system

Abstract

The present invention belongs to the field of oil production, and specifically relates to an in-well tubing hanger recovery tool and an in-well tubing suspension system, comprising a tool body, a first locking ring sleeved on the tool body, one side of the first locking ring abutting against the tool body, and a first driving member movably provided on the other side, the first driving member having an end close to the first locking ring with a gradually shrinking outer wall profile and / or an end of the first locking ring close to the first driving member with a gradually shrinking inner wall profile, the first driving member can squeeze the inner wall of the first locking ring when moving toward the first locking ring, and stretch the first locking ring to be clamped on the tubing hanger, thereby locking the recovery tool and the tubing hanger; during the locking process, it is only necessary to drive the action of the first driving member, which is simple and easy to control, and during the recovery process, due to the squeezing and support of the inner wall of the first locking ring by the first driving member, the first locking ring can always remain in a stretched state, thereby improving the stability of recovery.

Description

Technical Field

[0001] The invention relates to the field of oil production, in particular to an in-well oil pipe hanger recovery tool and an in-well oil pipe suspension system. Background Art

[0002] The tubing hanger is an important equipment in offshore oil production. It is mainly used to hang and fix the tubing to ensure the stable operation of the tubing in the deep sea. When the tubing hanger in the well is salvaged or recovered, a recovery tool is required.

[0003] The existing recovery tool has a complicated action when locking with the tubing hanger after moving into place, and the locking stability during the recovery process is poor. Summary of the invention

[0004] In order to solve the above technical problems, on the one hand, the present invention provides an in-well tubing hanger recovery tool, including a tool body and a first locking assembly, wherein the first locking assembly includes:

[0005] A first driving member is disposed on the tool body and can reciprocate along a first direction, wherein the first direction is a direction from the wellhead to the inside of the well along the axial direction of the tubing hanger;

[0006] a first locking ring, sleeved on the tool body, wherein the first driving member and the first locking ring are arranged in sequence along the first direction, and an end surface of the first locking ring away from the first driving member abuts against the tool body;

[0007] Wherein, one end of the first driving member close to the first locking ring has an outer wall profile that gradually shrinks along the first direction, and / or one end of the first locking ring close to the first driving member has an inner wall profile that gradually shrinks along the first direction;

[0008] When the first driving member approaches the first locking ring along the first direction, based on the support of the tool body on the first driving member, the outer wall profile of the first driving member presses the inner wall profile of the first locking ring and squeezes into the first locking ring, so that the first locking ring expands and is clamped in the first locking groove of the tubing hanger;

[0009] The first locking ring includes a first portion that can be clamped in the first locking groove and a second portion that can radially abut against the outer side of the groove body of the first locking groove. When the first locking ring is expanded, the second portion abuts against the limiting wall above the first locking groove, the lower end surface of the first portion abuts against the tool body, and the upper end surface of the first portion abuts against the first locking groove.

[0010] Preferably, a first pressure chamber is provided on the tool body, and one end of the first driving member away from the first locking ring is sealed and installed in the first pressure chamber, and the first driving member is driven to move in the first direction based on the increase of pressure in the first pressure chamber.

[0011] Preferably, it further comprises a mandrel fixedly connected to the tool body, and a hydraulic oil circuit leading to the first pressure chamber is provided on the mandrel and the tool body.

[0012] Preferably, the hydraulic oil circuit in the core shaft includes a first branch and a second branch which are interconnected, the first branch is used to increase the pressure in the first pressure chamber, and the second branch is provided with a pressure relief valve, when the liquid pressure in the core shaft exceeds the pressure relief threshold of the pressure relief valve, the liquid pressure in the core shaft is discharged through the second branch.

[0013] On the other hand, the present invention also provides an in-well tubing hanging system, comprising the above-mentioned tubing hanger and an in-well tubing hanger recovery tool,

[0014] The tubing hanger comprises a hanger body, a setting ring and a well locking ring are sequentially sleeved on the outer side of the hanger body along the first direction, an end surface of the well locking ring away from the setting ring abuts against the hanger body, the setting ring can reciprocate on the hanger body along the first direction, and the first locking groove is arranged on the setting ring;

[0015] A first supporting portion and a second supporting portion are sequentially arranged on the hanger body along the first direction, for limiting the distance that the setting ring can reciprocate along the first direction;

[0016] When the setting ring cooperates with the second supporting part, the end of the setting ring facing the first direction is located inside the well locking ring, and the well locking ring is supported by the setting ring and clamped in the well wall groove; when the setting ring cooperates with the first supporting part, the setting ring is separated from the well locking ring, and the well locking ring retracts and separates from the well wall groove.

[0017] Preferably, a movable seat is provided on the tool body, and the movable seat can reciprocate along the first direction on the tool body, and a second locking assembly is provided on the movable seat, and the second locking assembly includes a second driving member and a second locking ring, the second driving member is reciprocatingly provided on the movable seat along the first direction, and the second locking ring is sleeved on the movable seat, the second driving member and the second locking ring are arranged in sequence along the first direction, and the end surface of the second locking ring away from the second driving member abuts against the movable seat;

[0018] Wherein, one end of the second driving member close to the second locking ring has an outer wall profile that gradually contracts along the first direction, and / or one end of the second locking ring close to the second driving member has an inner wall profile that gradually contracts along the first direction, when the second driving member approaches the second locking ring along the first direction, based on the support of the second locking ring by the movable seat, the outer wall profile of the second driving member squeezes the inner wall profile of the second locking ring to expand the second locking ring;

[0019] The hanger body is provided with a second locking groove, and the second locking ring is engaged in the second locking groove when the second locking ring is expanded.

[0020] Preferably, a first limiting portion and a second limiting portion are sequentially provided on the tool body along the first direction, for limiting the distance that the movable seat can reciprocate on the tool body along the first direction;

[0021] Among them, when the sealing ring cooperates with the second supporting part, and the first locking assembly and the second locking assembly are respectively locked in the first locking groove and the second locking groove, the movable distance of the movable seat relative to the tool body is the same as the movable distance of the sealing ring relative to the hanger body, so that when the sealing ring cooperates with the first supporting part, the movable seat cooperates with the second limiting part.

[0022] Preferably, the first driving member and the second driving member are both hydraulically driven, and a pressure pipeline for driving the first driving member is connected to a pressure pipeline for driving the second driving member.

[0023] Preferably, a first pre-tightening pin is provided between the first driving member and the tool body for locking the first driving member and the tool body along the first direction; a second pre-tightening pin is provided between the second driving member and the movable seat for locking the second driving member and the movable seat along the first direction.

[0024] Preferably, the shear resistance of the first preload pin is better than the shear resistance of the second preload pin.

[0025] By applying the technical solution provided by the present invention, a first locking ring is sleeved on the tool body, one side of the first locking ring is abutted against the tool body, and a first driving member is movably provided on the other side, and the end of the first driving member close to the first locking ring has a gradually shrinking outer wall contour and / or the end of the first locking ring close to the first driving member has a gradually shrinking inner wall contour. When the first driving member moves toward the first locking ring, the outer wall of the first driving member contacts the inner wall of one side of the first locking ring, and at the same time, the tool body supports the end face of the other side of the first locking ring, so that the first driving member stretches the first locking ring, and then the first locking ring is clamped on the corresponding part of the tubing hanger, so as to realize the locking of the recovery tool and the tubing hanger. During the locking process, it is only necessary to drive the action of the first driving member, which is simple and easy to control. In the recovery process after the locking is completed, due to the squeezing and support of the inner wall of the first locking ring by the first driving member, the first locking ring can always maintain the stretched state, that is, maintain the matching state with the tubing hanger, thereby improving the stability of the recovery. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a structural schematic diagram of an in-well tubing hanger recovery tool provided by an embodiment of the present invention;

[0027] Figure 2 It is a structural schematic diagram of the cooperation between an in-well tubing hanger recovery tool and an in-well tubing hanger in an in-well tubing hanging system provided by one embodiment of the present invention;

[0028] Figure 3a It is a structural schematic diagram of a tubing hanger and a well wall in a locked state in a well tubing hanging system provided by an embodiment of the present invention;

[0029] Figure 3b It is a schematic structural diagram of an oil pipe hanger and a well wall in an unlocked state in an in-well oil pipe hanging system provided by an embodiment of the present invention;

[0030] Figure 4 It is a structural schematic diagram of a second locking assembly in a well oil pipe suspension system provided by an embodiment of the present invention;

[0031] Among them, 1. recovery tool; 11. tool body; 111. first support part; 112. first pressure chamber; 113. second pressure chamber; 114. first limit part; 115. second limit part; 12. first locking assembly; 121. first driving member; 122. first locking ring; 1221. first part; 1222. second part; 13. mandrel; 131. first pressure bearing member; 132. second pressure bearing member; 133. pressure bearing pin; 14. movable seat; 141. second Supporting part; 142, first sliding part; 143, locking pliers; 15, second locking assembly; 151, second driving member; 1511, locking boss; 152, second locking ring; 2, tubing hanger; 21, hanger body; 211, second locking groove; 212, first supporting part; 213, second supporting part; 22, sealing ring; 221, first locking groove; 2211, limiting wall; 222, second sliding part; 23, well locking ring; 3, well wall; 31, well wall groove. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] Figure 1 It is a structural schematic diagram of an in-well tubing hanger recovery tool provided by one embodiment of the present invention.

[0034] like Figure 1 As shown, the present invention provides an in-well tubing hanger recovery tool, the recovery tool 1 comprises a tool body 11 and a first locking assembly 12, the first locking assembly 12 comprises a first driving member 121 and a first locking ring 122, the first driving member 121 is arranged on the tool body 11 so as to be reciprocating along a first direction, the first direction is a direction from the wellhead to the well along the axial direction of the tubing hanger, Figure 1 In the figure, the first direction is the downward direction, the first locking ring 122 is sleeved on the tool body 11, and the end surface of the first locking ring 122 away from the first driving member 121 abuts against the first supporting portion 111 of the tool body 11;

[0035] Among them, one end of the first driving member 121 close to the first locking ring 122 has an outer wall profile that gradually shrinks along the first direction, and one end of the first locking ring 122 close to the first driving member 121 has an inner wall profile that gradually shrinks along the first direction. When the first driving member 121 is close to the first locking ring 122, one end surface of the first locking ring 122 abuts against the first supporting portion 111, so that the first driving member 121 and the first supporting portion 111 squeeze the first locking ring 122, and the end of the first driving member 121 squeezes into the inner side of the first locking ring 122 and stretches the first locking ring 122, so that the first locking ring 122 is clamped in the first locking groove 221 on the tubing hanger 2;

[0036] During the process of locking the first locking assembly 12 with the first locking groove 221, it is only necessary to drive the movement of the first driving member 121 to realize the expansion of the first locking ring 122 and the locking with the first locking groove 221, which is simple and easy to control. After the first locking ring 122 is locked with the first locking groove 221, during the process of pulling the recovery tool 1 to recover the oil pipe hanger 2, due to the squeezing and support of the inner wall of the first locking ring 122 by the first driving member 121, the first locking ring 122 can always maintain the expanded state, that is, it can ensure that during the recovery process, the first locking ring 122 is always locked in the first locking groove 221, thereby improving the stability and safety of the recovery.

[0037] Further, such as Figure 1 As shown in the figure, the lower end of the first driving member 121 and the upper inner wall of the first locking ring 122 are gradually contracted along the first direction, and the contraction surface is a uniform inclined surface, so that the lower end of the first driving member 121 contacts the inclined surface of the upper inner wall of the first locking ring 122. When the first driving member 121 moves along the first direction, a greater component force perpendicular to the first direction is applied to the inner wall of the first locking ring 122, thereby being more conducive to opening the first locking ring 122; and the first locking ring 122 has a certain axial length, so that After the end of the first driving member 121 enters the first locking ring 122, the supporting portion above the contraction section of the end of the first driving member 121 contacts the inner cylindrical surface of the first locking ring 122, so that when the first driving member 121 moves along the first direction until it contacts the first supporting portion 111, there is only an interaction force between the first driving member 121 and the first locking ring 122 along the radial direction of the first locking ring 122, and there is no component force along the first direction (axial direction), so that in the locked state, the expanded state of the first locking ring 122 is more stable.

[0038] It should be noted that in Figure 1In the illustrated embodiment, the lower end of the first driving member 121 and the upper inner wall of the first locking ring 122 both gradually shrink along the first direction, and the shrinking surface is a uniform inclined surface. In some other embodiments, only the end of the first driving member 121 can be gradually shrunk, or only the inner wall of the first locking ring 122 can be gradually shrunk, or the gradually shrinking wall surface can be a curved surface, etc., as long as the first driving member 121 can expand the first locking ring 122 when it moves toward the first locking ring 122.

[0039] In addition, the first driving member 121 can adopt a sleeve-shaped structure, so that when it squeezes the inner wall of the first locking ring 122, it can evenly squeeze various parts of the inner wall of the first locking ring 122, thereby ensuring that the first locking ring 122 can be smoothly opened. The first driving member 121 can also adopt other types of structures, which are not specifically limited here. The first locking ring 122 can adopt a C-shaped clamp ring, a clamp and other structures, which have a certain elasticity and can naturally open when subjected to radial outward force. When the external force is removed, it can also shrink and recover under the action of elasticity.

[0040] like Figure 1 As shown, in one specific embodiment, the first locking groove 221 has a hook-shaped structure extending radially inward, and the first locking ring 122 has a first portion that can be snapped into the hook-shaped structure and a second portion that can abut against the outer surface of the groove body of the first locking groove 221, so that when the first locking ring 122 is stretched, the first portion 1221 is located inside the first locking groove 221, and the second portion 1222 abuts against the limiting wall 2211 outside the first locking groove 221, and the limiting wall 2211 is used to prevent the first locking ring 122 from being locked. The cooperation between 11 and the second part 1222 can limit the radial expansion range of the first locking ring 122, so that the lower end face of the first part 1221 of the first locking ring 122 abuts against the first support part 111, and the upper end face abuts against the first locking groove 221. When the tool body 11 is pulled, the first support part 111 drives the first locking ring 122 to move, so that the first locking ring 122 applies an upward force to the tubing hanger 2 through the first locking groove 221, thereby realizing the lifting and recovery of the tubing hanger 2.

[0041] like Figure 1 As shown, in one of the preferred embodiments, a first pressure chamber 112 is provided on the tool body 11, and one end of the first driving member 121 away from the first locking ring 122 is sealed and installed inside the first pressure chamber 112. Based on the increase in the internal pressure of the first pressure chamber 112, the first driving member 121 can be driven to move along the first direction.

[0042] Further, such as Figure 1As shown, the first pressure chamber 112 can be a sealing groove body extending along the first direction, which is composed of a tool body 11 and a piston ring mounted on the outside of the tool body 11, so that the tool body 11 and the piston ring form an annular space, and the first driving member 121 can be configured as a sleeve shape that cooperates with the annular space, so that the annular space forms both a pressure chamber for applying pressure to drive the first driving member 121 and a limiting groove for guiding and limiting the movement of the first driving member 121.

[0043] Among them, high-pressure oil can be used as the pressure medium in the first pressure chamber 112, and the pressure in the first pressure chamber 112 can always be maintained during the recovery process after the locking is completed, thereby ensuring the position state of the first driving member 121 and the first locking ring 122, and improving the locking stability of the first locking ring 122 and the first locking groove 221 during the recovery process.

[0044] like Figure 1 As shown, in one of the preferred embodiments, the recovery tool 1 also includes a core shaft 13 fixedly connected to the tool body 11, and a hydraulic oil circuit connected to the first pressure chamber 112 is opened on the core shaft 13 and the tool body 11. The tool body 11 located in the well is remotely pressurized through the core shaft 13, which facilitates the control of the pressure in the first pressure chamber 112.

[0045] In one of the preferred embodiments, the hydraulic oil circuit in the core shaft 13 includes a first branch and a second branch that are interconnected. The first branch is used to increase the pressure in the first pressure chamber 112. The second branch is provided with a pressure relief valve. When the hydraulic pressure in the core shaft 13 exceeds the pressure relief threshold of the pressure relief valve, the hydraulic pressure in the core shaft 13 is discharged from the second branch.

[0046] like Figure 1 As shown, the core shaft 13 is configured as a hollow structure, and a first branch leading to the first pressure chamber 112 is opened on the side wall of the core shaft 13, and a first pressure-bearing member 131 and a second pressure-bearing member 132 are arranged at the end of the core shaft located in the well. The first pressure-bearing member 131 and the second pressure-bearing member 132 can close the end of the inner through hole of the core shaft 13, and a pressure-bearing pin 133 is arranged between the second pressure-bearing member 132 and the inner wall of the core shaft 13. When the liquid pressure in the core shaft 13 exceeds the strength of the pressure-bearing pin 133, the pressure-bearing pin 133 is sheared off, so that the first pressure-bearing member 131 and the second pressure-bearing member 132 are disengaged from the core shaft 13, so that the liquid pressure in the core shaft 13 can be discharged from the through hole at the bottom.

[0047] In addition, the pressure relief valve can also be set in the hydraulic oil circuit of the tool body 11. Setting the pressure relief valve in the core shaft 13 is only a preferred embodiment for facilitating the oil circuit layout and processing, and should not be regarded as a limitation on the protection scope. The pressure relief valve can be a high-pressure overflow valve, a pressure relief valve, etc.

[0048] Figure 2 It is a structural schematic diagram of the cooperation between an in-well tubing hanger recovery tool and an in-well tubing hanger in an in-well tubing hanging system provided by one embodiment of the present invention; Figure 3a It is a structural schematic diagram of a tubing hanger and a well wall in a locked state in a well tubing hanging system provided by an embodiment of the present invention; Figure 3b It is a structural schematic diagram of an oil pipe hanger and a well wall in an unlocked state in an in-well oil pipe suspension system provided by an embodiment of the present invention.

[0049] like Figure 2 , Figure 3a as well as Figure 3b As shown, the present invention also provides an in-well tubing hanging system, comprising the above-mentioned tubing hanger 2 and the recovery tool 1, the tubing hanger 2 comprising a hanger body 21 and a setting ring 22 and a well locking ring 23 sequentially sleeved on the hanger body 21 along a first direction, the setting ring 22 is reciprocatingly movable along the first direction on the hanger body 21, similar to the principle of the first locking assembly 12, through the movement and extrusion of the setting ring 22, the well locking ring 23 can be opened and clamped in the well wall groove 31, so as to realize the locking of the tubing hanger and the well wall 3;

[0050] Furthermore, a first supporting portion 212 and a second supporting portion 213 are sequentially arranged on the hanger body 21 along the first direction, and a second sliding portion 222 is arranged on the setting ring 22. The second sliding portion 222 can slide between the first supporting portion 212 and the second supporting portion 213, and can limit the distance of the reciprocating motion of the setting ring 22 along the first direction.

[0051] like Figure 3a and Figure 3b As shown, when the second sliding portion 222 cooperates with the second supporting portion 213, the end of the setting ring 22 facing the first direction is located inside the well locking ring 23, and at this time, the well locking ring 23 is opened by the setting ring 22 and clamped in the well wall groove 31. When the setting ring 22 cooperates with the first supporting portion 212, the setting ring 22 is separated from the well locking ring 23, and the well locking ring 23 is retracted and separated from the well wall groove 31.

[0052] When the first locking ring 122 of the recovery tool 1 is locked with the first locking groove 221 of the sealing ring 22, the recovery tool 1 is pulled up, so that the sealing ring 22 is lifted upward and disengaged from the second supporting portion 213 and the well locking ring 23, thereby releasing the locking state of the tubing hanger 2 and the well wall 3, and the recovery tool 1 is continuously pulled up until the sealing ring 22 is engaged with the first supporting portion 212. Based on the cooperation between the sealing ring 22 and the first supporting portion 212, the pulling force of the recovery tool 1 is applied to the hanger body 21. At this time, the locking state of the tubing hanger 2 and the well wall 3 has been released, and the recovery tool 1 is further pulled up until the recovery of the tubing hanger 2 is completed.

[0053] By setting the first supporting part 212 and the second supporting part 213 to limit the setting ring 22, during the use of the hanger, the setting ring 22 and the well locking ring 23 can lock the tubing hanger 2 and the well wall 3, thereby improving the stability during use. When the tubing hanger 2 needs to be recovered, the first locking ring 122 of the recovery tool 1 can be locked to the setting ring 22, and the setting ring 22 can be lifted first to separate it from the well locking ring 23, thereby releasing the lock between the tubing hanger 2 and the well wall 3. When the setting ring 22 cooperates with the first supporting part, the setting ring 22 is further lifted, that is, it is lifted and recovered together with the hanger body 21. The whole action process is simple and clear, which is more convenient for the use and recovery of the tubing hanger.

[0054] The well locking ring 23 may adopt a structure similar to the retaining spring of the first locking ring 122 . When the setting ring 22 is pulled out of the well locking ring 23 , the well locking ring 23 can shrink naturally to release the lock with the well wall groove 31 .

[0055] like Figure 2 As shown, in one preferred embodiment, a movable seat 14 is provided on the tool body 11, and the movable seat 14 can reciprocate along the first direction on the tool body 11. A second locking assembly 15 is provided on the movable seat 14, and the second locking assembly 15 includes a second driving member 151 and a second locking ring 152. The second driving member 151 is reciprocatably provided on the movable seat 14 along the first direction, and the second locking ring 152 is sleeved on the movable seat 14. The second driving member 151 and the second locking ring 152 are arranged in sequence along the first direction, and the end surface of the second locking ring 152 away from the second driving member 151 abuts against the movable seat 14;

[0056] Similar to the first locking assembly, one end of the second driving member 151 close to the second locking ring 152 has an outer wall profile that gradually contracts along the first direction, and / or one end of the second locking ring 152 close to the second driving member 151 has an inner wall profile that gradually contracts along the first direction. When the second driving member 151 approaches the second locking ring 152 along the first direction, based on the support of the second supporting portion 141 on the movable seat 14 to the second locking ring 152, the outer wall profile of the second driving member 151 squeezes the inner wall profile of the second locking ring 152, so that the second locking ring 152 expands and is locked in the second locking groove 211 provided on the hanger body 21.

[0057] By providing the movable seat 14 and the second locking assembly 15, the recovery tool 1 is locked to the sealing ring by the first locking assembly 12 and to the hanger body 21 by the second locking assembly 15 at the same time, and the movable seat 14 is movably arranged on the tool body 11 along the first direction, that is, the second locking assembly 15 is movable along the first direction relative to the first locking assembly 12, so that after the second locking assembly 15 is locked to the hanger body 21, the first locking assembly 12 can still be used to lift the sealing ring 22 by pulling the tool body 11, so that the sealing ring 22 moves relative to the hanger body 21, thereby realizing the unlocking of the well locking ring 23 and the well wall groove 31, and then the tool body 11 is pulled again, and the weight of the tubing hanger 2 is jointly borne by the first locking assembly 12 and the second locking assembly 15, which can improve the safety and stability of the recovery process.

[0058] Further, such as Figure 2 As shown in one preferred embodiment, a first limiting portion 114 and a second limiting portion 115 are sequentially arranged on the tool body 11 along the first direction, and a first sliding portion 142 is arranged on the movable seat 14. The first sliding portion 142 can reciprocate along the first direction between the first limiting portion 114 and the second limiting portion 115, thereby limiting the distance of the reciprocating movement of the movable seat 14 relative to the tool body 11 along the first direction, and as shown in FIG. Figure 3a and Figure 3b As shown, when the sealing ring 22 cooperates with the second supporting portion and the first locking assembly 12 and the second locking assembly 15 are respectively locked in the first locking groove 221 and the second locking groove 211, the movable distance of the movable seat 14 relative to the tool body 11 is the same as the movable distance of the sealing ring 22 relative to the hanger body 21, so that when the sealing ring 22 cooperates with the first supporting portion 212, the movable seat 14 just cooperates with the second limiting portion 115.

[0059] Based on the above arrangement, after the first locking assembly 12 is locked in the first locking groove 221 and the second locking assembly 15 is locked in the second locking groove 211, the tool body 11 is pulled up, and the first locking assembly 12 pulls up the setting ring 22, so that the setting ring 22 moves relative to the hanger body 21, thereby unlocking the well locking ring 23 and the well wall groove 31, and then the tool body 11 is pulled up again. In this process, the movable seat 14 moves relative to the tool body 11 and the setting ring 22 moves relative to the hanger body 21. Until the sealing ring 22 cooperates with the first supporting portion 212, the hanger body 21 and the sealing ring 22 are lifted up by the tool body 11 together, and at the same time, the movable seat 14 just cooperates with the second limiting portion 115, that is, the hanger body 21 can be lifted up by the first locking assembly 12 and the sealing ring 22, and the hanger body 21 can also be lifted up by the second locking assembly 15. The weight of the tubing hanger 2 is jointly borne by the first locking assembly 12 and the second locking assembly 15, which can improve the safety and stability of the recovery process.

[0060] In addition, the relative movement between the movable seat 14 and the tool body 11 can also be limited by other means, so that the movable seat 14 and the second locking assembly 15 do not affect the unlocking of the setting ring 22 and the well locking ring 23, and can provide a pulling force on the hanger body 21 after the setting ring 22 cooperates with the first supporting portion 212;

[0061] Alternatively, the movable seat 14 can also be fixedly connected to the tool body 11. When locking, the first locking assembly 12 and the sealing ring 22 are first locked and the sealing ring 22 is lifted. During this process, the movable seat 14 moves synchronously with the tool body 11. When the sealing ring 22 cooperates with the first supporting portion 212, the second locking ring 152 on the movable seat 14 is just aligned with the second locking groove 211 of the hanger body 21. At this time, the second locking ring 152 is stretched open to lock the second locking assembly 15 with the second locking groove 211, that is, the movable seat 14, the tool body 11 and the hanger body 21 are locked, which can also achieve the unlocking of the sealing ring 22 and the joint bearing of the weight of the tubing hanger 2 by the first locking assembly 12 and the second locking assembly 15.

[0062] like Figure 2 As shown, in one preferred embodiment, the first driving member 121 and the second driving member 151 are both hydraulically driven, and the pressure pipeline for driving the first driving member 121 is interconnected with the pressure pipeline of the second driving member 151, forming a first pressure chamber 112 and a second pressure chamber 113 that are interconnected on the tool body 11. The structure of the second pressure chamber 113 can be similar to the structure of the first pressure chamber 112 in the previous text, and will not be repeated here. Through the above settings, when the pressure pipeline in the tool body 11 is pressurized, the locking of the first locking assembly 12 and the first locking groove 221 and the locking of the second locking assembly 15 and the second locking groove 211 can be completed, which improves the convenience of control.

[0063] Furthermore, in one preferred embodiment, a first pre-tightening pin is provided between the first driving member 121 and the tool body 11 for locking the first driving member 121 and the tool body 11 along the first direction, and a second pre-tightening pin is provided between the second driving member 151 and the movable seat 14 for locking the second driving member 151 and the movable seat 14 along the first direction.

[0064] By setting the pre-tightening pin, when the hydraulic pipeline in the tool body 11 is not pressurized, the first driving member 121 and the tool body 11, as well as the second driving member 151 and the movable seat 14 are in a relatively fixed state. When the recovery tool 1 moves into position relative to the tubing hanger 2, it is pressurized again, and the pressing pressure is higher than the strength of the first pre-tightening pin and the second pre-tightening pin, so that the first pre-tightening pin and the second pre-tightening pin are sheared under the action of pressure, thereby enabling the first driving member 121 and the tool body 11, as well as the second driving member 151 and the movable seat 14 to move relative to each other, and then the first driving member 121 and the second driving member 151 are driven to move accordingly, thereby completing the locking of the recovery tool 1 and the tubing hanger 2.

[0065] In one of the preferred embodiments, the shear resistance of the first pre-tightening pin can be set to be better than the shear resistance of the second pre-tightening pin, that is, when the hydraulic pipeline in the tool body 11 is pressurized, the second pre-tightening pin breaks before the first pre-tightening pin, so that the locking actions of the second locking assembly 15 and the first locking assembly 12 are in sequence, and the first pressure is applied first to make the second driving member 151 shear off the second pre-tightening pin. After the second driving member 151 is in place, the second pressure is applied again to make the first driving member 121 shear off the first pre-tightening pin, so that the actions of the first locking assembly 12 and the second locking assembly 15 under the action of hydraulic pressure are more stable and easy to control.

[0066] Figure 4 It is a structural schematic diagram of a second locking assembly in a well tubing suspension system provided by an embodiment of the present invention.

[0067] like Figure 4 As shown, in one preferred embodiment, a locking clamp 143 is provided on the movable seat 14, a first end of the locking clamp 143 is fixedly connected to the movable seat 14, a second end of the locking clamp 143 extends in the opposite direction of the first direction, and a radially extending boss is provided at the end of the second end to form a hook-shaped structure, and a locking boss 1511 is provided on the second driving member 151. When the second driving member 151 is close to the second locking ring 152 along the first direction, the locking boss 1511 squeezes the second end of the locking clamp 143. When the second driving member 151 opens the second locking ring 152 and moves into position relative to the second locking ring 152, the locking boss 1511 just passes over the boss at the second end of the locking pliers 143, and the locking boss 1511 is located inside the hook-shaped structure of the locking pliers 143, so that the hook-shaped structure can limit the movement of the locking boss 1511 in the opposite direction to the first direction, thereby ensuring the stability of the cooperation between the second driving member 151 and the second locking ring 152, thereby improving the stability of the locking of the recovery tool 1 and the tubing hanger 2.

[0068] In addition, a barb structure similar to the locking pliers 143 can also be set between the first locking assembly 12 and the tool body 11, so that after the first drive member 121 and the first locking ring 122 move relative to each other in place, the barb structure can limit the movement of the first drive member 121 in the opposite direction of the first direction, so as to further improve the stability of the locking of the recovery tool 1 and the oil pipe hanger 2.

[0069] In one of the preferred embodiments, the end surface edges of the tool body 11 and the movable seat 14 that are close to the tubing hanger 2 are both provided with chamfers or rounded corners. When the tool body 11 and the movable seat 14 move toward the tubing hanger 2, these chamfers and rounded corners can play a role in limiting and guiding, making it easier to lower the recovery tool 1 to the specified position of the tubing hanger 2.

[0070] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention is described in detail with reference to the embodiments, it should be understood by those skilled in the art that any modification or equivalent replacement of the technical solutions of the present invention does not depart from the spirit and scope of the technical solutions of the present invention and should be included in the scope of the claims of the present invention.

Claims

1. A wellbore tubing hanger recovery tool, characterized in that: The invention comprises a tool body and a first locking assembly, wherein the first locking assembly comprises: A first driving member is disposed on the tool body and can reciprocate along a first direction, wherein the first direction is a direction from the wellhead to the inside of the well along the axial direction of the tubing hanger; a first locking ring, sleeved on the tool body, wherein the first driving member and the first locking ring are arranged in sequence along the first direction, and an end surface of the first locking ring away from the first driving member abuts against the tool body; Wherein, one end of the first driving member close to the first locking ring has an outer wall profile that gradually shrinks along the first direction, and / or one end of the first locking ring close to the first driving member has an inner wall profile that gradually shrinks along the first direction; When the first driving member approaches the first locking ring along the first direction, based on the support of the tool body on the first driving member, the outer wall profile of the first driving member presses the inner wall profile of the first locking ring and squeezes into the first locking ring, so that the first locking ring expands and is clamped in the first locking groove of the tubing hanger; The first locking ring includes a first portion capable of being clamped in the first locking groove and a second portion capable of being radially abutted against the outer side of the groove body of the first locking groove. When the first locking ring is expanded, the second portion abuts against the limiting wall above the first locking groove, the lower end surface of the first portion abuts against the tool body, and the upper end surface of the first portion abuts against the first locking groove. The tubing hanger comprises a hanger body, a setting ring and a well locking ring are sequentially sleeved on the outer side of the hanger body along the first direction, and the first locking groove is arranged on the setting ring; The tool body is provided with a movable seat, the movable seat can reciprocate along the first direction on the tool body, and the movable seat is provided with a second locking assembly, the second locking assembly includes a second driving member and a second locking ring; The hanger body is provided with a second locking groove, and the second locking ring is engaged in the second locking groove when the second locking ring is expanded.

2. The in-well tubing hanger recovery tool according to claim 1, characterized in that: A first pressure chamber is provided on the tool body, and one end of the first driving member away from the first locking ring is sealed and installed in the first pressure chamber. Based on the increase of pressure in the first pressure chamber, the first driving member is driven to move along the first direction.

3. The in-well tubing hanger recovery tool according to claim 2, characterized in that: It also includes a core shaft fixedly connected to the tool body, and a hydraulic oil circuit leading to the first pressure chamber is opened on the core shaft and the tool body.

4. The in-well tubing hanger recovery tool according to claim 3, characterized in that: The hydraulic oil circuit in the core shaft includes a first branch and a second branch which are interconnected. The first branch is used to increase the pressure in the first pressure chamber. The second branch is provided with a pressure relief valve. When the hydraulic pressure in the core shaft exceeds the pressure relief threshold of the pressure relief valve, the hydraulic pressure in the core shaft is discharged through the second branch.

5. An in-well tubing hanging system, comprising the tubing hanger according to any one of claims 1 to 4 and the in-well tubing hanger recovery tool, characterized in that: The end surface of the well locking ring away from the setting ring abuts against the hanger body, and the setting ring can reciprocate along the first direction on the hanger body; A first supporting portion and a second supporting portion are sequentially arranged on the hanger body along the first direction, for limiting the distance that the setting ring can reciprocate along the first direction; When the setting ring cooperates with the second supporting part, the end of the setting ring facing the first direction is located inside the well locking ring, and the well locking ring is supported by the setting ring and clamped in the well wall groove; when the setting ring cooperates with the first supporting part, the setting ring is separated from the well locking ring, and the well locking ring retracts and separates from the well wall groove.

6. The in-well oil pipe suspension system according to claim 5, characterized in that: The second driving member is disposed on the movable seat so as to be reciprocatable along the first direction, the second locking ring is sleeved on the movable seat, the second driving member and the second locking ring are sequentially arranged along the first direction, and the end surface of the second locking ring away from the second driving member abuts against the movable seat; Among them, one end of the second driving member close to the second locking ring has an outer wall profile that gradually shrinks along the first direction, and / or one end of the second locking ring close to the second driving member has an inner wall profile that gradually shrinks along the first direction. When the second driving member approaches the second locking ring along the first direction, based on the support of the second locking ring by the movable seat, the outer wall profile of the second driving member squeezes the inner wall profile of the second locking ring to expand the second locking ring.

7. The in-well oil pipe suspension system according to claim 6, characterized in that: A first limiting portion and a second limiting portion are sequentially arranged on the tool body along the first direction, for limiting the distance that the movable seat can reciprocate on the tool body along the first direction; Among them, when the sealing ring cooperates with the second supporting part, and the first locking assembly and the second locking assembly are respectively locked in the first locking groove and the second locking groove, the movable distance of the movable seat relative to the tool body is the same as the movable distance of the sealing ring relative to the hanger body, so that when the sealing ring cooperates with the first supporting part, the movable seat cooperates with the second limiting part.

8. The in-well oil pipe suspension system according to claim 7, characterized in that: The first driving member and the second driving member are both hydraulically driven, and a pressure pipeline for driving the first driving member is communicated with a pressure pipeline for driving the second driving member.

9. The in-well oil pipe suspension system according to claim 8, characterized in that: A first pre-tightening pin is provided between the first driving member and the tool body for locking the first driving member and the tool body along the first direction; a second pre-tightening pin is provided between the second driving member and the movable seat for locking the second driving member and the movable seat along the first direction.

10. The in-well oil pipe suspension system according to claim 9, characterized in that: The shear resistance of the first preload pin is better than the shear resistance of the second preload pin.

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