Emergency recovery tool for top sealing steel ring of subsea Christmas tree

Abstract

The utility model discloses an emergency recovery tool for a top sealing steel ring of an underwater Christmas tree. The emergency recovery tool comprises a limiting mechanism, a locking assembly and a hoisting assembly. The limiting mechanism is arranged on the periphery of the sealing steel ring in a sleeving mode, and the bottom of the limiting mechanism makes contact with the top of the Christmas tree. The locking assembly comprises a limiting piece fixedly installed on the limiting mechanism, a locking piece capable of doing reciprocating motion in the radial direction of the sealing steel ring, and a guiding locking mechanism arranged between the limiting piece and the locking piece and used for guiding and locking motion of the locking piece. The locking piece has a locking state in which the locking piece is inserted and pressed in the groove of the sealing steel ring in the radial direction and an unlocking state in which the locking piece retreats from the groove. The underwater operation of operators is not needed, the labor intensity is reduced, the completeness of the sealing steel ring can be ensured, the loss of the sealing steel ring is reduced, the service life of the sealing steel ring is prolonged, the recovery cost is saved, the recovery is safer, and the safety is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of metal sealing ring fetching and delivering tools, in particular to an emergency recovery tool for the top sealing steel ring of a subsea Christmas tree. Background Technique

[0002] In the prior art assembly, in the oil production equipment used in oil fields, sealing steel rings are usually used for sealing between the flanges of the Christmas tree.

[0003] When it is necessary to recover the sealing steel ring when it fits too tightly with the top of the Christmas tree, due to the uneven force during the operation process, the sealing steel ring is easily damaged, and the recovery time is long, time-consuming and laborious, and it is not easy to operate. Summary of the Utility Model

[0004] The technical problem to be solved by the utility model is to provide an emergency recovery tool for the top sealing steel ring of a subsea Christmas tree.

[0005] The technical solution adopted by the utility model to solve its technical problem is: to construct an emergency recovery tool for the top sealing steel ring of a subsea Christmas tree, including a limiting mechanism, a locking assembly and a lifting assembly; the limiting mechanism is sleeved outside the sealing steel ring, and the bottom of the limiting mechanism is in contact with the top of the Christmas tree; the locking assembly includes a limiting member fixedly installed on the limiting mechanism, a locking member that can reciprocate in the radial direction of the sealing steel ring, and a guiding and locking mechanism arranged between the limiting member and the locking member to guide and lock the movement of the locking member; the locking member includes a locked state in which it is radially inserted and pressed into the groove of the sealing steel ring, and an unlocked state in which it exits the groove; the lifting assembly is arranged above the limiting mechanism.

[0006] Further, the limiting mechanism includes a first ring, the first ring is sleeved outside the sealing steel ring, and the bottom of the first ring is in contact with the top of the Christmas tree.

[0007] Further, the limiting member is a fixed nut fixedly installed on the limiting mechanism; the locking member is a screw rod meshed with the fixed nut; the guiding and locking mechanism includes a thread pair arranged between the limiting member and the locking member.

[0008] Further, the limiting member is a limiting block fixedly installed on the limiting mechanism; the locking member is an inserting rod sliding in the limiting block; the guiding and locking mechanism includes a pin slidably connected to the limiting member, a locking groove opened on the inserting rod, and a spring arranged between the pin and the limiting member. In the locked state, the pin is inserted into the locking groove under the push of the spring.

[0009] Further, the lifting assembly includes a plurality of ear plates circumferentially installed on the edge of the limiting mechanism, and threading holes are provided on the ear plates.

[0010] Further, the limiting mechanism further includes a second ring installed on the first ring and sleeved on the periphery of the sealing steel ring; the second ring is arranged parallel to the first ring, and a hollow part is provided between the first ring and the second ring.

[0011] Further, a first chamfer is provided at one end of the limiting member facing the sealing steel ring, and a second chamfer is provided at the bottom of the first ring.

[0012] Further, a protective member covering above the sealing steel ring is installed on the upper part of the limiting mechanism.

[0013] Further, the protective member is in the shape of a circular plate or a hemispherical shape.

[0014] Further, a holding member is vertically installed on the limiting member.

[0015] Implementing the present utility model has the following beneficial effects: In this application, the towing rope is installed on the lifting assembly, and then the recovery tool is lowered to the top of the Christmas tree. The underwater robot can transmit the relative position between the underwater recovery tool and the sealing steel ring to the operator's display on the ground in real time. Then, with the assistance of the underwater robot, the relative position between the recovery tool and the sealing steel ring is adjusted so that the limiting mechanism is sleeved on the sealing steel ring. Then, the towing rope is lowered so that the bottom of the limiting mechanism contacts the top of the Christmas tree. After checking that the locking member of the locking assembly is flush with the groove of the sealing steel ring through the underwater robot, the underwater robot activates the locking member, and the locking member moves towards the center along the radial direction of the sealing steel ring. The locking member is inserted and pressed into the groove of the sealing steel ring, and the guiding and locking mechanism will lock the movement of the locking member, so that the locking member and the sealing steel ring remain relatively stationary and reach the locked state. Since the locking assembly is circumferentially arranged on the limiting mechanism, after the locking members around are all inserted and pressed into the grooves of the sealing steel ring, the recovery tool is pulled upward by the towing rope and the lifting assembly, so that the locking member drives the sealing steel ring to separate from the Christmas tree, achieving the recovery effect. When the locking member drives the sealing steel ring to reach the ground, the guiding and locking mechanism loosens the locking member, and the locking member moves towards a position away from the center of the sealing steel ring, and the locking member exits the groove of the sealing steel ring, reaching the unlocked state, thereby separating the sealing steel ring from the recovery tool. The whole process saves the recovery time, the operator does not need to work underwater, reduces the labor intensity, can also ensure the integrity of the sealing steel ring, reduces the loss of the sealing steel ring, extends the service life of the sealing steel ring, saves the recovery cost, is safer during recovery, and improves the safety. Description of the Drawings

[0016] To more clearly illustrate the technical solution of the present utility model, the present utility model will be further described below in conjunction with the accompanying drawings and embodiments. It should be understood that the following drawings only show some embodiments of the present utility model, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings.

[0017] In the accompanying drawings:

[0018] Figure 1 is a schematic structural diagram of an emergency recovery tool for the top sealing steel ring of a subsea production tree provided by an embodiment of the present utility model;

[0019] Figure 2 is a schematic cross-sectional view of a limiting mechanism and a locking assembly provided by an embodiment of the present utility model;

[0020] Figure 3 is a schematic structural diagram of a limiting mechanism and a sealing steel ring provided by an embodiment of the present utility model;

[0021] Figure 4 is a schematic cross-sectional view of a protective member provided by an embodiment of the present utility model;

[0022] Figure 5 is a schematic cross-sectional view of a limiting block and an insertion rod provided by an embodiment of the present utility model.

[0023] Description of the reference signs in the drawings

[0024] Limiting mechanism 1, first ring 11, second ring 12, hollow part 13, locking assembly 2, limiting member 21, fixing nut 211, limiting block 212, locking member 22, screw rod 221, insertion rod 222, guiding and locking mechanism 23, insertion pin 231, locking groove 232, holding member 24, lifting assembly 3, ear plate 31, threading hole 32, sealing steel ring 4, production tree 5, groove 6, protective member 7. Detailed implementation manners

[0025] To have a clearer understanding of the technical features, objectives, and effects of the present utility model, the detailed implementation manners of the present utility model will now be described in detail with reference to the accompanying drawings. In the following description, it should be understood that the orientation or positional relationships indicated by "front", "rear", "upper", "lower", "left", "right", "longitudinal", "transverse", "vertical", "horizontal", "top", "bottom", "inner", "outer", "head", "tail", etc. are based on the orientation or positional relationships shown in the accompanying drawings, with a specific orientation structure and operation, and are only for the convenience of describing the present technical solution, rather than indicating that the indicated device or element must have a specific orientation. Therefore, it should not be construed as a limitation to the present utility model.

[0026] It should also be noted that, unless otherwise clearly specified and defined, terms such as "installation", "connection", "linkage", "fixation", "setting", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components. When a component is referred to as being "on" or "under" another component, the component can be "directly" or "indirectly" located above the other component, or there may also be one or more intermediate components. Terms such as "first", "second", "third", etc. are only for the convenience of describing the present technical solution, and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first", "second", "third", etc. can explicitly or implicitly include one or more of such features. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0027] In the following description, specific details such as specific system structures and technologies are presented for the purpose of illustration rather than limitation, so as to thoroughly understand the embodiments of the present utility model. However, those skilled in the art should clearly understand that the present utility model can also be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to avoid unnecessary details from interfering with the description of the present utility model.

[0028] Please refer to Figures 1 to 4 , in the underwater christmas tree top seal steel ring emergency recovery tool of the plug-in part in the first embodiment of the present utility model, it includes a limiting mechanism 1, a locking assembly 2, and a lifting assembly 3. The limiting mechanism 1 is sleeved around the outer periphery of the seal steel ring 4, and the bottom of the limiting mechanism 1 is in contact with the top of the christmas tree 5. The locking assembly 2 includes a limiting member 21 fixedly installed on the limiting mechanism 1, a locking member 22 that can reciprocate in the radial direction of the seal steel ring 4, and a guiding and locking mechanism 23 provided between the limiting member 21 and the locking member 22 to guide and lock the movement of the locking member 22. The locking member 22 includes a locked state in which it is radially inserted and pressed into the groove 6 of the seal steel ring 4, and an unlocked state in which it withdraws from the groove 6. The lifting assembly 3 is arranged above the limiting mechanism 1.

[0029] Among them, after the limiting mechanism 1 is sleeved around the outer periphery of the sealing steel ring 4 and the bottom of the limiting mechanism 1 contacts the top of the Christmas tree 5, the locking assembly 2 installed on the limiting mechanism 1 is flush with the groove 6 of the sealing steel ring 4. Then, the underwater robot is used to activate the locking assembly 2, so that the locking piece 22 of the locking assembly 2 is inserted and pressed tightly into the groove 6 of the sealing steel ring 4 to reach the locked state. During this process, the underwater robot conducts tracking and positioning throughout the process, and the relative position between the recovery tool and the sealing steel ring 4 is transmitted to the ground in real time through the camera on the underwater robot, thereby improving the positioning accuracy, reducing the labor intensity of the operator, and being able to complete the mutual locking between the recovery tool and the sealing steel ring 4 more quickly.

[0030] Among them, the mutual cooperation of a motor, a rack and a gear set can be adopted to drive the locking piece 22 to reciprocate in the radial direction of the sealing steel ring 4. When it is desired that the locking piece 22 is flush with the groove 6 of the sealing steel ring 4, the motor can be started, and the mutual cooperation of the gear and the rack drives the locking piece 22 to move along the radial direction of the sealing steel ring 4 towards the center of the sealing steel ring 4, so that the locking piece 22 is inserted and pressed tightly into the groove 6 of the sealing steel ring 4. Furthermore, the forward or reverse movement of the motor can be remotely started, thereby reducing the labor intensity. During the recovery process, since the force is evenly distributed around, it is not easy to damage the sealing steel ring 4, saving the recovery time and improving the recovery efficiency.

[0031] In this application, an underwater robot-assisted limiting mechanism 1 is sleeved around the periphery of the sealing steel ring 4, and the bottom of the limiting mechanism 1 is in contact with the top of the Christmas tree 5. The locking assembly 2 includes a limiting member 21 fixedly installed on the limiting mechanism 1, a locking member 22 that can reciprocate in the radial direction of the sealing steel ring 4, and a guiding and locking mechanism 23 arranged between the limiting member 21 and the locking member 22 to guide and lock the movement of the locking member 22. The locking member 22 includes a locked state where it is radially inserted and pressed into the groove 6 of the sealing steel ring 4, and an unlocked state where it exits the groove 6. The lifting assembly 3 is arranged above the limiting mechanism 1. Install the towing rope on the lifting assembly 3, and then lower the recovery tool to the top of the Christmas tree. Through the underwater robot, the relative position between the underwater recovery tool and the sealing steel ring 4 can be transmitted to the operator's display on the ground in real time. Then, through the assistance of the underwater robot, the relative position between the recovery tool and the sealing steel ring 4 is adjusted so that the limiting mechanism 1 is sleeved on the sealing steel ring 4. Then, lower the towing rope so that the bottom of the limiting mechanism 1 is in contact with the top of the Christmas tree 5. After checking through the underwater robot that the locking member 22 of the locking assembly 2 is flush with the groove 6 of the sealing steel ring 4, the underwater robot activates the locking member 22, causing the locking member 22 to move towards the center along the radial direction of the sealing steel ring 4. The locking member 22 is inserted and pressed into the groove 6 of the sealing steel ring 4, and the guiding and locking mechanism 23 will lock the movement of the locking member 22, keeping the relative static state between the locking member 22 and the sealing steel ring 4 to reach the locked state. Since the locking assembly 2 is arranged circumferentially on the limiting mechanism 1, after all the surrounding locking members 22 are inserted and pressed into the groove 6 of the sealing steel ring 4, pull the recovery tool upward through the towing rope and the lifting assembly 3, causing the locking member 22 to drive the sealing steel ring 4 to separate from the Christmas tree 5, achieving the recovery effect. When the locking member 22 drives the sealing steel ring 4 to the ground, the guiding and locking mechanism 23 is loosened to release the locking member 22, and the locking member 22 moves towards a position away from the center of the sealing steel ring 4, and the locking member 22 exits the groove 6 of the sealing steel ring 4, reaching the unlocked state, thereby separating the sealing steel ring 4 from the recovery tool. The whole process saves the recovery time, the operator does not need to work underwater, reducing the labor intensity, and can also ensure the integrity of the sealing steel ring 4, reduce the loss of the sealing steel ring 4, extend the service life of the sealing steel ring 4, save the recovery cost, and is safer during recovery, improving the safety performance.

[0032] Please refer to Figures 1 to 3 , in some embodiments, the limiting mechanism 1 includes a first ring 11, the first ring 11 is sleeved around the periphery of the sealing steel ring 4, and the bottom of the first ring 11 is in contact with the top of the Christmas tree 5.

[0033] In this application, the limiting mechanism 1 includes a first ring 11. The first ring 11 is sleeved around the periphery of the sealing steel ring 4, and the bottom of the first ring 11 is in contact with the top of the Christmas tree 5. The first ring 11 has the same shape as the sealing steel ring 4, which is convenient for saving the occupied space underwater and improving the operability of the recovery tool. The inner diameter of the first ring 11 is larger than the outer diameter of the sealing steel ring 4, which is convenient for the operator to sleeve the first ring 11 around the periphery of the sealing steel ring 4, and thus the operation is more rapid. After the bottom of the first ring 11 is in contact with the top of the Christmas tree 5, by setting the thicknesses of the first ring 11 and the limiting member 21, the symmetry axis of the locking member 22 can be made to coincide with the symmetry axis of the groove 6 of the sealing steel ring 4, which is convenient for the locking member 22 to be inserted and pressed tightly in the groove 6, thereby improving the positioning accuracy. The first ring 11 sleeved around the periphery of the sealing steel ring 4 can maintain the relative position between the recovery tool and the sealing steel ring 4 during the locking process, prevent the recovery tool from moving, and thus improve the recovery efficiency, making it more labor-saving and convenient.

[0034] Please refer to Figures 1 to 4 , in some embodiments, the limiting member 21 is a fixing nut 211 fixedly installed on the limiting mechanism 1, the locking member 22 is a screw 221 meshing with the fixing nut 211, and the guiding and locking mechanism 23 includes a thread pair arranged between the limiting member 21 and the locking member 22.

[0035] Among them, the guiding and locking mechanism 23 includes a thread pair arranged between the limiting member 21 and the locking member 22. The thread pair can lock the limiting member 21 and the locking member 22 in real time. Only by rotating the locking member 22 can the locking member 22 be moved, and thus the moving distance of the locking member 22 at different positions of the sealing steel ring 4 can be adjusted, so that the locking members 22 around are evenly inserted and pressed tightly in the groove 6 of the sealing steel ring 4. Therefore, during the recovery process, the forces on the four sides of the sealing steel ring 4 are more uniform, reducing the loss of the sealing steel ring 4, maintaining the integrity of the sealing steel ring 4, and extending the service life of the sealing steel ring 4.

[0036] In this application, the limiting member 21 is a fixing nut 211 fixedly installed on the limiting mechanism 1, the locking member 22 is a screw rod 221 meshing with the fixing nut 211, and the guiding and locking mechanism 23 includes a thread pair arranged between the limiting member 21 and the locking member 22. After the symmetry axis of the locking member 22 coincides with the symmetry axis of the groove 6, the underwater robot is used to rotate the screw rod 221, so that the screw rod 221 rotates on the fixing nut 211, and the screw rod 221 moves towards the center along the radial direction of the sealing steel ring 4, so that the screw rod 221 is inserted into the groove 6. After all the surrounding screw rods 221 are inserted into the groove 6, the underwater robot is used to gradually tighten the surrounding screw rods 221 relatively, so that the surrounding screw rods 221 are inserted and pressed tightly in the groove 6. Since the screw rods 221 are tightened relatively, the pressure of the screw rods 221 on the sealing steel ring 4 is relatively uniform, thereby reducing the wear of the sealing steel ring 4, improving the integrity of the sealing steel ring 4, and prolonging the service life of the sealing steel ring 4.

[0037] Please refer to Figure 2 and Figure 4 , in some embodiments, the limiting member 21 is a limiting block 212 fixedly installed on the limiting mechanism 1, the locking member 22 is a plug rod 222 sliding in the limiting block 212, and the guiding and locking mechanism 23 includes a plug pin 231 slidably connected to the limiting member 21, a locking groove 232 opened on the plug rod 222, and a spring arranged between the plug pin 231 and the limiting member 21. In the locked state, the plug pin 231 is inserted into the locking groove 232 under the push of the spring.

[0038] Among them, a certain damping fit is adopted between the limiting block 212 and the plug rod 222. A layer of glue or rubber pad can be applied between the limiting block 212 and the plug rod 222 to prevent the separation between the plug rod 222 and the limiting block 212 underwater. Similarly, a limiting ring can be arranged on the plug rod 222 to prevent the plug rod 222 from sliding out of the limiting block 212. Similarly, the spring arranged between the plug pin 231 and the limiting member 21 will push the plug pin 231 into contact with the plug rod 222, increasing the friction force with the plug rod 222 and preventing the plug rod 222 from separating from the limiting block 212, thereby improving the recovery efficiency and facilitating the operation.

[0039] In this application, the limiting member 21 is a limiting block 212 fixedly installed on the limiting mechanism 1, the locking member 22 is a plug rod 222 slidably disposed within the limiting block 212, and the guiding and locking mechanism 23 includes a plug pin 231 slidably connected to the limiting member 21, a locking groove 232 formed on the plug rod 222, and a spring disposed between the plug pin 231 and the limiting member 21. In the locked state, the plug pin 231 is inserted into the locking groove 232 under the push of the spring. After the symmetry axis of the locking member 22 coincides with the symmetry axis of the groove 6, the underwater robot is operated to push the plug rod 222 towards the center of the sealing steel ring 4, causing the plug rod 222 to slide within the limiting block 212. When the plug rod 222 comes into contact with the groove 6, the locking groove 232 on the plug rod 222 will move to the lower end of the plug pin 231, and then the plug pin 231 will enter the locking groove 232 under the action of the spring. Through the mutual cooperation between the locking groove 232 and the plug pin 231, the relative static state is maintained between the plug rod 222 and the limiting block 212, thus completing the locking state. Similarly, the underwater robot sequentially pushes the relatively opposite plug rods 222 around towards the center of the sealing steel ring 4, causing the plug rods 222 around to be inserted and pressed tightly within the groove 6, making the pressure of the plug rods 222 on the sealing steel ring 4 relatively uniform, thereby reducing the wear on the sealing steel ring 4, improving the integrity of the sealing steel ring 4, and extending the service life of the sealing steel ring 4.

[0040] Among them, when it is desired to remove the sealing steel ring 4 from the recovery tool, since both sides of the locking groove 232 are circular arcs, the operator can conveniently move the plug rod 222, causing the plug rod 222 to drive the plug pin 231 to retract into the limiting block 212 against the elastic force of the spring, enabling the plug rods 222 around to withdraw from the groove 6, thereby achieving the unlocked state. The operation is more labor-saving and convenient, reducing the labor intensity and improving the recovery efficiency.

[0041] Please refer to Figure 2 and Figure 3 In some embodiments, the lifting assembly 3 includes a plurality of ear plates 31 circumferentially installed on the edge of the limiting mechanism 1, and threading holes 32 are provided on the ear plates 31.

[0042] In this application, the lifting assembly 3 includes a plurality of ear plates 31 circumferentially installed on the edge of the limiting mechanism 1, and threading holes 32 are provided on the ear plates 31. The plurality of ear plates 31 are evenly installed on the edge of the limiting mechanism 1, and the towing rope passes through the threading holes 32 and is tied to the ear plates 31. When the recovery tool drives the sealing steel ring 4 to be lifted, since the plurality of ear plates 31 are evenly installed on the edge of the limiting mechanism 1, the upward lifting force received by the recovery tool around can be made more uniform, preventing the recovery tool from deflecting and causing damage to the sealing steel ring 4, thereby maintaining the integrity of the sealing steel ring 4, extending the service life of the sealing steel ring 4, and also facilitating the separation of the sealing steel ring 4 from the top of the Christmas tree 5, improving the recovery efficiency.

[0043] Please refer toFigure 2 and Figure 3 In some embodiments, the limiting mechanism 1 further includes a second ring 12 mounted on the first ring 11 and sleeved around the outer periphery of the sealing steel ring 4. The second ring 12 is arranged parallel to the first ring 11, and a hollow portion 13 is provided between the first ring 11 and the second ring 12.

[0044] In this application, the limiting mechanism 1 further includes a second ring 12 mounted on the first ring 11 and sleeved around the outer periphery of the sealing steel ring 4. The second ring 12 is arranged parallel to the first ring 11. The second ring 12 can increase the overall connection strength of the limiting mechanism 1 and extend the service life. The second ring 12 can also make the first ring 11 more stably sleeved on the sealing steel ring 4, increase the positioning accuracy, prevent the first ring 11 from deforming after multiple uses, and thus extend the service life and improve the stability.

[0045] In this application, a hollow portion 13 is provided between the first ring 11 and the second ring 12. The hollow portion 13 can facilitate the operator to observe the relative position between the locking assembly 2 and the groove 6 of the sealing steel ring 4 through the underwater robot, and thus can be adjusted in time, improve the positioning efficiency, and make the recovery process more convenient and labor-saving, and improve the recovery efficiency.

[0046] Please refer to Figure 5 , in some embodiments, a first chamfer is provided at one end of the limiting member 21 facing the sealing steel ring 4, and a second chamfer is provided at the bottom of the first ring 11.

[0047] In this application, a first chamfer is provided at one end of the limiting member 21 facing the sealing steel ring 4. The limiting member 21 with the first chamfer is convenient to be inserted into the groove 6, reduces the operation difficulty of the underwater robot, and improves the recovery efficiency.

[0048] In this application, a second chamfer is provided at the bottom of the first ring 11. The first ring 11 with the second chamfer can facilitate the first ring 11 to be sleeved around the outer periphery of the sealing steel ring 4. The second chamfer plays a guiding role for the first ring 11, thereby reducing the operation difficulty, reducing the labor intensity, and improving the recovery efficiency.

[0049] Please refer to Figure 3 and Figure 4 , in some embodiments, a protective member 7 covering above the sealing steel ring 4 is installed on the upper part of the limiting mechanism 1.

[0050] In this application, a protective member 7 is installed above the upper part of the limiting mechanism 1 and covers the sealing steel ring 4. During the process of recovering the sealing steel ring 4, the protective member 7 can prevent impurities from falling into the well, damaging the sealing steel ring 4 or polluting the downhole liquid. Similarly, it can also protect the Christmas tree 5, thereby improving safety, preventing damage to the sealing steel ring 4, and extending the service life of the sealing steel ring 4.

[0051] Please refer to Figures 3 to 4 , in some embodiments, the protective member 7 is in the shape of a circular plate or a hemisphere.

[0052] In this application, since the protective member 7 is in the shape of a circular plate, the circular plate-shaped protective member 7 is more convenient to manufacture, reduces the cost of manufacturing the recovery tool, is also convenient for installation, improves the assembly efficiency, can also reduce the weight of the recovery tool, is convenient for operation, and improves the recovery efficiency.

[0053] In this application, since the protective member 7 is in the shape of a hemisphere, the hemispherical protective member 7 bends downward, and thus the hemispherical protective member 7 can play a certain guiding role when the first ring 11 is sleeved on the sealing steel ring 4, thereby facilitating the operation of the operator and improving the positioning efficiency. Since the hemispherical protective member 7 bends downward, a concave arc appears on the upper part of the protective member 7. When impurities fall, they will enter the concave arc, and the concave arc can prevent the impurities from falling out during the lifting process, further improving safety and reducing the pollution of the liquid.

[0054] Please refer to Figure 3 and Figure 4 , in some embodiments, a holding member 24 is vertically installed on the limiting member 21.

[0055] In this application, since a holding member 24 is vertically installed on the limiting member 21, the holding member 24 can facilitate the underwater robot to clamp, and the underwater robot or the operator can control the limiting member 21 through the holding member 24, enabling the limiting member 21 to rotate or slide more labor-savingly, thereby facilitating the operation and improving the recovery efficiency.

[0056] It can be understood that the above embodiments only represent the preferred embodiments of the present utility model, and the description is relatively specific and detailed, but it should not be construed as a limitation to the scope of the patent of the present utility model. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present utility model, the above technical features can be freely combined, and several deformations and improvements can also be made, which all belong to the protection scope of the present utility model. Therefore, all equivalent transformations and modifications made to the scope of the claims of the present utility model shall fall within the scope covered by the claims of the present utility model.

Claims

1. An emergency recovery tool for the top sealing steel ring of a subsea Christmas tree, characterized in that, It includes a limit mechanism (1), a locking assembly (2), and a lifting assembly (3); The limit mechanism (1) is sleeved around the outer periphery of the sealing steel ring (4), and the bottom of the limit mechanism (1) is in contact with the top of the Christmas tree (5); The locking assembly (2) includes a limiting member (21) fixedly installed on the limit mechanism (1), a locking member (22) that can reciprocate in the radial direction of the sealing steel ring (4), and a guiding and locking mechanism (23) provided between the limiting member (21) and the locking member (22) to guide and lock the movement of the locking member (22); The locking member (22) includes a locked state in which it is radially inserted and pressed into the groove (6) of the sealing steel ring (4), and an unlocked state in which it exits the groove (6); The lifting assembly (3) is arranged above the limit mechanism (1).

2. The emergency recovery tool for the top seal steel ring of the subsea production tree according to claim 1, wherein The limit mechanism (1) includes a first ring (11), the first ring (11) is sleeved around the outer periphery of the sealing steel ring (4), and the bottom of the first ring (11) is in contact with the top of the Christmas tree (5).

3. The emergency recovery tool for the top seal steel ring of the subsea Christmas tree according to claim 1, characterized in that, The limiting member (21) is a fixing nut (211) fixedly installed on the limit mechanism (1); The locking member (22) is a screw rod (221) meshed with the fixing nut (211); The guiding and locking mechanism (23) includes a thread pair provided between the limiting member (21) and the locking member (22).

4. The emergency recovery tool for the top seal steel ring of the subsea christmas tree according to claim 1, characterized in that The limiting member (21) is a limiting block (212) fixedly installed on the limit mechanism (1); The locking member (22) is a plug rod (222) sliding in the limiting block (212); The guiding and locking mechanism (23) includes a pin (231) slidably connected to the limiting member (21), a locking groove (232) formed on the plug rod (222), and a spring provided between the pin (231) and the limiting member (21). In the locked state, the pin (231) is inserted into the locking groove (232) under the push of the spring.

5. The emergency recovery tool for the top seal steel ring of the subsea christmas tree according to claim 1, characterized in that, The lifting assembly (3) includes a plurality of ear plates (31) circumferentially installed on the edge of the limit mechanism (1), and threading holes (32) are provided on the ear plates (31).

6. The emergency recovery tool for the top sealing steel ring of the subsea production tree according to claim 2, characterized in that The limit mechanism (1) further includes a second ring (12) installed on the first ring (11) and sleeved around the outer periphery of the sealing steel ring (4); the second ring (12) is arranged parallel to the first ring (11), and a hollow part (13) is provided between the first ring (11) and the second ring (12).

7. The emergency recovery tool for the top seal steel ring of the subsea Christmas tree according to claim 6, characterized in that, One end of the limiting member (21) facing the sealing steel ring (4) is provided with a first chamfer, and the bottom of the first ring (11) is provided with a second chamfer.

8. The emergency recovery tool for the top seal steel ring of the subsea Christmas tree according to claim 1, characterized in that A protective member (7) covering above the sealing steel ring (4) is installed on the upper part of the limit mechanism (1).

9. The emergency recovery tool for the top seal steel ring of the subsea Christmas tree according to claim 8, characterized in that, The protective member (7) is in the shape of a circular plate or a hemisphere.

10. The emergency recovery tool for the top seal steel ring of the subsea production tree according to claim 1, characterized in that, A holding member (24) is vertically installed on the limiting member (21).

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