Transverse supporting device with mechanical and hydraulic locking structure and locking and supporting method

Abstract

The invention discloses a transverse supporting device with a mechanical and hydraulic locking structure. The transverse supporting device comprises a locking component mandrel, a friction block, a supporting ring, a supporting frame, a driving component mandrel nut, a hydraulic cylinder, a piston cylinder sleeve, a piston, a piston outer cylinder sleeve, a piston inner cylinder sleeve, a shaft sleeve, a spring fixing cover, a groove belleville spring, an installation positioning component end cover and a load ring. The locking and supporting method comprises the steps that firstly, a plurality of underwater transverse supporting devices are evenly distributed and installed on an integrated hanger, then hydraulic pipelines are connected to locking and unlocking liquid injection openings correspondingly, and finally hydraulic locking supporting or mechanical locking supporting is achieved by introducing hydraulic pressure into the locking hydraulic cavity or controlling an ROV to unscrew a mandrel nut. The locking and supporting device has hydraulic locking and mechanical locking functions, the core shaft piston head has the anti-falling and self-locking functions under the small-angle conical surface design, the continuous supporting effect can be provided, and the stability of the hanging adapter and the rigid vertical pipe in the hanging adapter in the underwater complex environment is effectively guaranteed.

Description

Technical Field

[0001] The present invention belongs to the technical field of offshore oil and gas drilling and production equipment, and relates to a lateral support device with mechanical and hydraulic locking structures. The present invention also relates to a method for locking and supporting a suspension adapter on an integrated hanger using the lateral support device. Background Art

[0002] With the gradual depletion of onshore oil and gas resources and the progressive development of offshore oil and gas, the application of floating platforms such as FPSOs is becoming increasingly widespread. During the oil and gas production process, the floating platform is connected to the subsea oil and gas pipeline through a riser. The riser is usually connected and lowered through corresponding suspension equipment on the floating platform. These production equipment not only need to withstand the action of loads such as wind, waves, and currents during actual use, but also, since the riser is directly connected to the floating platform through the suspension equipment, it also needs to withstand the acting force caused by the movement of the floating platform. The loading conditions are complex. As an essential key component in the offshore oil exploitation system, the structural safety of the riser is particularly important, requiring the riser to maintain stability for a long time and avoid large displacement actions. To further improve the operation efficiency, reduce the operation cost and time, a new type of equipment integrated hanger has been developed. This equipment is applied to the pipe gallery on one side of the FPSO ship's side and can support both rigid and flexible risers at the same time. During actual use, the riser is installed on the suspension adapter inside it, and the suspension adapter seat is installed on the integrated hanger. In order to ensure the stability of the suspension adapter and the riser inside it and avoid its shaking inside the integrated hanger affecting production safety, therefore, a device for supporting and locking the suspension adapter and its riser needs to be developed. Summary of the Invention

[0003] The object of the present invention is to provide a lateral support device with mechanical and hydraulic locking structures, which has the characteristics of being able to mechanically and hydraulically lock the suspension adapter and the rigid riser inside it.

[0004] Another object of the present invention is to provide a method for locking and supporting a suspension adapter on an integrated hanger using the above-mentioned lateral support device.

[0005] The technical solution adopted by the present invention is that the lateral support device with mechanical and hydraulic locking structures includes a mandrel, which consists of a shaft rod and a conical piston head. The shaft rod and the conical piston head are coaxial, and the shaft diameter of the shaft rod is smaller than the shaft diameter of the conical piston head. A mandrel nut and a hydraulic drive mechanism are provided on the shaft rod, and the hydraulic drive mechanism is close to one end of the conical piston head. A support frame is provided on the conical piston head, and an end cover and a support ring are sleeved on the support frame. The end cover is close to one end of the shaft rod, and a load ring is threadedly sleeved on the support ring. The load ring is connected to the end cover by screw c.

[0006] The characteristics of the present invention also lie in:

[0007] Lateral support device with mechanical and hydraulic locking structures. The hydraulic drive mechanism includes a piston cylinder sleeve, a piston inner cylinder sleeve, a piston, a piston outer cylinder sleeve, and a liquid cylinder that are sequentially sleeved from the inside out along the mandrel. The liquid cylinder is connected to the piston cylinder sleeve by screw a, the liquid cylinder is connected to the end cover by screw b, the liquid cylinder is connected to the mandrel nut near the shaft rod end, and a liquid injection mechanism is provided on the liquid cylinder; the hydraulic drive mechanism further includes a bushing, the bushing is located between the piston and the support frame, the bushing is threadedly connected to the mandrel, and the grooved disc spring is fixed inside the bushing by threadedly connecting with the spring fixing cover.

[0008] Lateral support device with mechanical and hydraulic locking structures. The liquid injection mechanism includes locking liquid injection ports Ⅰ and unlocking liquid injection ports Ⅰ evenly distributed on both sides of the piston on the liquid cylinder, and locking liquid injection ports Ⅱ and unlocking liquid injection ports Ⅱ; the locking liquid injection ports Ⅰ and Ⅱ are communicated with the locking hydraulic cavity, and the unlocking liquid injection ports Ⅰ and Ⅱ are communicated with the unlocking hydraulic cavity.

[0009] Lateral support device with mechanical and hydraulic locking structures. The piston cylinder sleeve is connected to the mandrel by splines; the bushing is threadedly connected to the mandrel.

[0010] Lateral support device with mechanical and hydraulic locking structures. Sector-shaped limiting shafts are symmetrically provided on the conical piston head of the mandrel; sector-shaped annular grooves are symmetrically provided inside the support frame; the sector-shaped limiting shafts are clamped with the sector-shaped annular grooves.

[0011] Lateral support device with mechanical and hydraulic locking structures. The support frame is in the shape of a closed cylinder at one end, and several friction blocks are evenly distributed circumferentially near the closed end. A mandrel limiting chute is provided on the inner surface of the support frame near the unclosed end.

[0012] Lateral support device with mechanical and hydraulic locking structures. The inner wall surface of the friction block in contact with the mandrel is a convex arc surface; the contact surface between the support ring and the friction block is a wavy surface.

[0013] Another technical solution adopted by the present invention is the method for locking and supporting the suspension adapter on the integrated hanger of the above-mentioned lateral support device, which is carried out according to the following steps:

[0014] Step 1: Install several such underwater lateral support devices evenly on the integrated hanger, then connect the hydraulic pipelines to the locking and unlocking liquid injection ports respectively, and connect the hydraulic pipelines of each locking liquid injection in series to ensure that the pressure in the locking hydraulic cavity of each support device is the same during the liquid injection process.

[0015] Step 2: Hydraulic locking: Inject hydraulic fluid into the locking hydraulic cavity to drive the piston to move. The piston will push the mandrel to move, driving the friction block and the support frame to move in the locking direction. The support frame is pushed out and contacts the suspension adapter, playing a role in supporting and locking. When the required locking pressure is reached, stop injecting fluid and release the pressure in the locking hydraulic cavity. The mandrel achieves self-locking, completing the locking and support of the underwater lateral support device; or: Mechanical locking: Operate the ROV to loosen the mandrel nut counterclockwise with a torque wrench to push the mandrel to move in the locking direction. When the required locking force is reached, tighten the mandrel nut in the reverse direction, and the mandrel achieves self-locking, completing the locking and support of the underwater lateral support device.

[0016] The beneficial effects of the present invention are as follows:

[0017] The underwater lateral support device has a simple structure and complete functions. It has the functions of hydraulically and mechanically locking the suspension adapter and the rigid riser inside it. Under the action of the grooved disc spring, it has an initial pre-tightening ability to prevent accidental movement of the mandrel during the lowering and installation process. After locking, the mandrel can achieve mechanical self-locking, effectively ensuring the position locking of the suspension adapter and the rigid riser inside it, improving its stability, enhancing its service life and production safety. When unlocking is required, simply apply pressure to the unlocking hydraulic cavity or loosen the nut with the ROV robot, and the operation is simple and convenient. Description of the Drawings

[0018] Figure 1 is a schematic structural diagram of the lateral support device of the present invention;

[0019] Figure 2 is a schematic structural diagram of the wavy surface on the inner wall surface of the support ring in the lateral support device of the present invention;

[0020] Figure 3 is a schematic structural diagram of the mandrel in the lateral support device of the present invention;

[0021] Figure 4 is a schematic structural diagram of the support frame in the lateral support device of the present invention.

[0022] In the figure, 1. Mandrel, 2. Mandrel nut, 3. Hydraulic cylinder, 4. Piston cylinder sleeve, 5. Piston, 6. Piston outer cylinder sleeve, 7. End cover, 8. Piston inner cylinder sleeve, 9. Bush, 10. Grooved disc spring, 11. Load ring, 12. Support ring, 13. Friction block, 14. Support frame, 15. Locking injection port I, 16. Unlocking injection port I, 17. Locking injection port II, 18. Unlocking injection port II, 19. Screw a, 20. Screw b, 21. Screw c, 22. Mandrel limit chute, 23. Integrated hanger, 24. Spring fixing cover, 25. Locking hydraulic cavity, 26. Unlocking hydraulic cavity, 27. Sector limit shaft, 28. Sector ring groove. Detailed Embodiments

[0023] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0024] The present invention provides a lateral support device with a mechanical and hydraulic locking structure, as Figure 1 shown, which includes a mandrel 1. The mandrel 1 is composed of a shaft rod and a conical piston head. The shaft rod and the conical piston head are coaxial, and the shaft diameter of the shaft rod is smaller than the shaft diameter of the conical piston head. The conical piston head of the mandrel 1 has a small-angle conical surface. The function of using the conical piston head for the mandrel 1 is that after locking, a mechanical self-locking can be formed between the conical surface of the mandrel 1 and the friction block 13 to prevent the support ring 14 from retracting. A mandrel nut 2 and a hydraulic driving mechanism are provided on the shaft rod, and the hydraulic driving mechanism is close to one end of the conical piston head. A support frame 14 is provided on the conical piston head, and an end cover 7 and a support ring 12 are sleeved on the support frame 14. The end cover 7 is close to one end of the shaft rod. The contact surface between the support ring 12 and the friction block 13 is a wavy surface, as Figure 2 shown, which can improve the friction coefficient of the surface and increase the friction capacity; the outer wall surface of the support ring 12 is installed on the load ring 11 through a threaded connection, and the load ring 11 and the end cover 7 are connected by a screw c21 to fix the entire lateral support device on the integrated hanger.

[0025] The above-mentioned hydraulic driving mechanism includes a piston cylinder sleeve 4, a piston inner cylinder sleeve 8, a piston 5, a piston outer cylinder sleeve 6 and a liquid cylinder 3 that are sequentially sleeved on the mandrel 1 from the inside to the outside. The liquid cylinder 3 is connected to the piston cylinder sleeve 4 by a screw a19. The piston cylinder sleeve 4 is connected to the mandrel 1 through a spline connection. The liquid cylinder 3 is connected to the end cover 7 by a screw b20. The liquid cylinder 3 is connected to the mandrel nut 2 at the end close to the shaft rod. A liquid injection mechanism is provided on the liquid cylinder 3; the hydraulic driving mechanism further includes a shaft sleeve 9. The shaft sleeve 9 is located between the piston 5 and the support frame 14. The shaft sleeve 9 is fixedly connected to the piston 5 through a threaded connection. The shaft sleeve 9 is connected to the mandrel 1 through a threaded connection. The grooved disc spring 10 is fixed inside the shaft sleeve 9 by a threaded connection with a spring fixing cover 24. The grooved disc spring 10 is in a compressed state in the initial stage and plays a pre-tightening role in the movement of the piston 5 and the mandrel 1.

[0026] The above-mentioned liquid injection mechanism includes a locking liquid injection port I 15 and an unlocking liquid injection port I 16 provided on the liquid cylinder 3 on one side of the piston 5, and a locking liquid injection port II 17 and an unlocking liquid injection port II 18 provided on the liquid cylinder 3 on the other side of the piston 5, which are used to inject hydraulic pressure into the locking hydraulic cavity 25 and the unlocking hydraulic cavity 26 to drive the piston 5 to move. The locking liquid injection port I 15 and the locking liquid injection port II 17 are communicated with the locking hydraulic cavity 25, and the unlocking liquid injection port I 16 and the unlocking liquid injection port II 18 are communicated with the unlocking hydraulic cavity 26.

[0027] As Figure 3 shown, two 90° sector-shaped limiting shafts 27 are symmetrically provided on the conical piston head of the mandrel 1; as Figure 4As shown in the figure, two corresponding 90° sector ring grooves 28 are provided inside the support frame 14. The mandrel piston head enters the inside of the support frame 14 through the sector ring groove 28 and then rotates 90° to complete the connection between the mandrel 1 and the support frame 14.

[0028] As Figure 4 shown, the support frame 14 is in the shape of a closed cylinder at one end. A number of friction blocks 13 are circumferentially distributed near the closed end. The inner wall surface of the friction block 13 in contact with the mandrel 1 is a convex arc surface, which can increase the contact pressure and friction force. The inner surface of the support frame 14 near the unclosed end is provided with a mandrel limit chute 22, and the mandrel limit chute 22 limits the mandrel 1.

[0029] The working principle of the present invention is as follows: When locking is required, the hydraulic locking chambers of the device are connected in series to ensure that the locking hydraulic pressures applied in each hydraulic cylinder are the same. Hydraulic pressure is injected into the locking hydraulic chamber 25 through the locking liquid injection port I 15 and the locking liquid injection port II 17 on the hydraulic cylinder 3. When the liquid pressure exceeds the friction pre-tightening force of the groove butterfly spring 10, the mandrel 1 starts to move horizontally. The mandrel 1 is threadedly connected to the bushing 9. Therefore, the mandrel 1 will drive the bushing 9, the spring fixed cover 24 and the groove butterfly spring 10 to move to the right as a whole. When the mandrel 1 comes into contact with the friction block 13, the small-angle conical surface of the mandrel 1 will push the friction block 13 to drive the support frame 14 to move to the right as a whole until the support frame 14 contacts the suspension adapter. Then, according to the set locking requirements, continue to pressurize to push the mandrel 1 to continue to move to the right in the locking direction, and at the same time push the friction block 13 to move outward, thereby squeezing the load ring 12. The pressure between the friction block 13 and the load ring 12 gradually increases, and the friction force also continuously increases until the locking hydraulic chamber 25 reaches the required locking pressure. Then, the locking hydraulic chamber 25 is depressurized, and after depressurization, the mandrel 1 and the friction block 13 form a self-locking state.

[0030] When the hydraulic locking fails, mechanical locking can be used. The ROV is used to control the torque wrench to rotate the mandrel nut 2. The mandrel nut 2 pushes the mandrel 1 to move to the right in the locking direction. After reaching the required locking requirements, rotate the mandrel nut 2 in the reverse direction to release the locking fixation of the mandrel 1. At this time, the mandrel 1 and the friction block 13 have formed a self-locking state.

[0031] When unlocking is required, only need to inject hydraulic pressure into the unlocking hydraulic chamber 26 through the unlocking liquid injection port I 16 and the unlocking liquid injection port II 18 or use the ROV to operate the torque wrench to loosen the mandrel nut 2, so that the mandrel 1 moves to the left in the unlocking direction to release the extrusion effect on the friction block 13. When the sector limit shaft 27 on the piston head of the mandrel 1 moves and contacts the leftmost end of the mandrel limit chute 22, the mandrel 1 will drive the support frame 14 to move and retract to the left in the unlocking direction. After reaching the specified position, the unlocking is completed.

[0032] The present invention provides a method for locking and supporting a suspension adapter on the above-mentioned lateral support device, which is carried out according to the following steps:

[0033] Step 1: Arrange and install several such underwater lateral support devices evenly on the integrated suspension device, then connect the hydraulic pipelines to the locking and unlocking liquid injection ports respectively, and make the hydraulic pipelines of each locking liquid injection in series to ensure that the pressure in the locking hydraulic chamber 25 of each support device is the same during the liquid injection process.

[0034] Step 2: Hydraulic locking: Inject hydraulic pressure into the locking hydraulic chamber 25 to drive the piston 5 to move. The piston 5 will push the mandrel 1 to move, driving the friction block 13 and the support frame 14 to move in the locking direction. The support frame 14 is pushed out and contacts the suspension adapter, playing a role in supporting and locking. When the required locking pressure is reached, stop injecting liquid, release the pressure in the locking hydraulic chamber 25, and the mandrel 1 realizes self-locking, completing the locking and support of the underwater lateral support device; or: Mechanical locking: Control the ROV to loosen the mandrel nut 2 counterclockwise with a torque wrench to push the mandrel 1 to move in the locking direction. When the required locking force is reached, tighten the mandrel nut 2 in the reverse direction, and the mandrel 1 realizes self-locking, completing the locking and support of the underwater lateral support device.

[0035] The present invention provides a lateral support device with mechanical and hydraulic locking structures, which solves the problem of underwater locking of the suspension adapter and the rigid riser inside it. The device has two locking methods, hydraulic locking and mechanical locking, which can fully realize on-water operation, with simple and convenient operation, avoiding underwater operations, reducing operation costs and operation time, and is provided with a pre-tightening and mechanical self-locking structure, which can meet complex underwater operation conditions, achieve continuous support and locking effects, and effectively ensure the stability and safety of the suspension adapter. When unlocking is required, only need to apply pressure to the unlocking hydraulic chamber 26 or loosen the nut through the ROV robot, and the operation is simple and convenient.

[0036] Embodiment 1

[0037] The present invention provides a lateral support device with mechanical and hydraulic locking structures, as Figure 1 shown, including a mandrel 1, which is composed of a shaft rod and a conical piston head. The shaft rod and the conical piston head are coaxial, and the shaft diameter of the shaft rod is smaller than the shaft diameter of the conical piston head; a mandrel nut 2 and a hydraulic driving mechanism are provided on the shaft rod, and the hydraulic driving mechanism is close to one end of the conical piston head; a support frame 14 is provided on the conical piston head, an end cover 7 and a support ring 12 are sleeved on the support frame 14, the end cover 7 is close to one end of the shaft rod, a load ring 11 is threadedly sleeved on the support ring 12, and the load ring 11 is connected to the end cover 7 by a screw c21.

[0038] The upper hydraulic drive mechanism includes a piston cylinder sleeve 4, a piston inner cylinder sleeve 8, a piston 5, a piston outer cylinder sleeve 6, and a liquid cylinder 3 that are sequentially sleeved on the mandrel 1 from the inside out. The liquid cylinder 3 is connected to the piston cylinder sleeve 4 by a screw a19, the liquid cylinder 3 is connected to the end cover 7 by a screw b20, the liquid cylinder 3 is connected to the mandrel nut 2 near the shaft rod end, and a liquid injection mechanism is provided on the liquid cylinder 3; the hydraulic drive mechanism further includes a bushing 9, the bushing 9 is located between the piston 5 and the support frame 14, the bushing 9 is threadedly connected to the mandrel 1, and the grooved disc spring 10 is fixed inside the bushing 9 by threadedly connecting with the spring fixing cover 24.

[0039] The above liquid injection mechanism includes a locking liquid injection port I 15 and an unlocking liquid injection port I 16 provided on the liquid cylinder 3 on one side of the piston 5, and a locking liquid injection port II 17 and an unlocking liquid injection port II 18 provided on the liquid cylinder 3 on the other side of the piston 5. The locking liquid injection port I 15 and the locking liquid injection port II 17 communicate with the locking hydraulic cavity 25, and the unlocking liquid injection port I 16 and the unlocking liquid injection port II 18 communicate with the unlocking hydraulic cavity 26.

[0040] Embodiment 2

[0041] The present invention provides a lateral support device with mechanical and hydraulic locking structures, as Figure 1 shown, including a mandrel 1, the mandrel 1 is composed of a shaft rod and a conical piston head, the shaft rod and the conical piston head are coaxial, and the shaft diameter of the shaft rod is smaller than the shaft diameter of the conical piston head; a mandrel nut 2 and a hydraulic drive mechanism are provided on the shaft rod, and the hydraulic drive mechanism is close to one end of the conical piston head; a support frame 14 is provided on the conical piston head, an end cover 7 and a support ring 12 are sleeved on the support frame 14, the end cover 7 is close to one end of the shaft rod, a load ring 11 is threadedly sleeved on the support ring 12, and the load ring 11 is connected to the end cover 7 by a screw c21.

[0042] The upper hydraulic drive mechanism includes a piston cylinder sleeve 4, a piston inner cylinder sleeve 8, a piston 5, a piston outer cylinder sleeve 6, and a liquid cylinder 3 that are sequentially sleeved on the mandrel 1 from the inside out. The liquid cylinder 3 is connected to the piston cylinder sleeve 4 by a screw a19, the liquid cylinder 3 is connected to the end cover 7 by a screw b20, the liquid cylinder 3 is connected to the mandrel nut 2 near the shaft rod end, and a liquid injection mechanism is provided on the liquid cylinder 3; the hydraulic drive mechanism further includes a bushing 9, the bushing 9 is located between the piston 5 and the support frame 14, the bushing 9 is threadedly connected to the mandrel 1, and the grooved disc spring 10 is fixed inside the bushing 9 by threadedly connecting with the spring fixing cover 24.

[0043] The piston cylinder sleeve 4 is connected to the mandrel 1 by a spline; the bushing 9 is threadedly connected to the mandrel 1.

[0044] Embodiment 3

[0045] The present invention provides a lateral support device with mechanical and hydraulic locking structures, as Figure 1As shown in the figure, it includes a mandrel 1, which is composed of a shaft rod and a conical piston head. The shaft rod and the conical piston head are coaxial, and the shaft diameter of the shaft rod is smaller than that of the conical piston head. A mandrel nut 2 and a hydraulic driving mechanism are provided on the shaft rod, and the hydraulic driving mechanism is close to one end of the conical piston head. A support frame 14 is provided on the conical piston head, and an end cover 7 and a support ring 12 are sleeved on the support frame 14. The end cover 7 is close to one end of the shaft rod, and a load ring 11 is threadedly sleeved on the support ring 12. The load ring 11 is connected to the end cover 7 by a screw c21.

[0046] Two 90° sector limiting shafts 27 are symmetrically provided on the conical piston head of the mandrel 1; two corresponding 90° sector ring grooves 28 are provided in the support frame 14, and the sector limiting shafts 27 are clamped with the sector ring grooves 28.

[0047] The support frame 14 is in the shape of a closed cylinder at one end, and 4 friction blocks 13 are circumferentially distributed evenly near the closed end. A mandrel limiting chute 22 is provided on the inner surface of the support frame 14 near the unclosed end. The inner wall surface of the friction block 13 in contact with the mandrel 1 is an outwardly convex arc surface; the contact surface between the support ring 12 and the friction block 13 is a wavy surface.

Claims

1. Lateral support device with mechanical and hydraulic locking structures, Characterized in that, it includes a mandrel (1), the mandrel (1) is composed of a shaft rod and a conical piston head, the shaft rod and the conical piston head are coaxial, and the shaft diameter of the shaft rod is smaller than the shaft diameter of the conical piston head; a mandrel nut (2) and a hydraulic driving mechanism are arranged on the shaft rod, and the hydraulic driving mechanism is close to one end of the conical piston head; a support frame (14) is arranged on the conical piston head, an end cover (7) and a support ring (12) are sleeved on the support frame (14), the end cover (7) is close to one end of the shaft rod, a load ring (11) is threadedly sleeved on the support ring (12), and the load ring (11) is connected to the end cover (7) by a screw c (21).

2. The lateral support device with mechanical and hydraulic locking structures according to claim 1, Characterized in that, the hydraulic driving mechanism includes a piston cylinder sleeve (4), a piston inner cylinder sleeve (8), a piston (5), a piston outer cylinder sleeve (6) and a liquid cylinder (3) which are sequentially sleeved on the mandrel (1) from inside to outside. The liquid cylinder (3) is connected to the piston cylinder sleeve (4) by a screw a (19), the liquid cylinder (3) is connected to the end cover (7) by a screw b (20), the liquid cylinder (3) is connected to the mandrel nut (2) at the end close to the shaft rod, and a liquid injection mechanism is arranged on the liquid cylinder (3); the hydraulic driving mechanism further includes a shaft sleeve (9), the shaft sleeve (9) is located between the piston (5) and the support frame (14), the shaft sleeve (9) is threadedly connected to the mandrel (1), and the grooved disc spring (10) is fixed inside the shaft sleeve (9) by threadedly connecting with a spring fixing cover (24).

3. The lateral support device with mechanical and hydraulic locking structures according to claim 2, Characterized in that, the liquid injection mechanism includes locking liquid injection ports I (15), unlocking liquid injection ports I (16), locking liquid injection ports II (17) and unlocking liquid injection ports II (18) which are evenly distributed on the liquid cylinder (3) on both sides of the piston (5); the locking liquid injection ports I (15) and the locking liquid injection ports II (17) are communicated with a locking hydraulic cavity (25), and the unlocking liquid injection ports I (16) and the unlocking liquid injection ports II (18) are communicated with an unlocking hydraulic cavity (26).

4. The lateral support device with mechanical and hydraulic locking structures according to claim 2, Characterized in that, the piston cylinder sleeve (4) is connected to the mandrel (1) by a spline; the shaft sleeve (9) is threadedly connected to the mandrel (1).

5. The lateral support device with mechanical and hydraulic locking structures according to claim 1, Characterized in that, symmetrical sector-shaped limiting shafts (27) are arranged on the conical piston head of the mandrel (1); symmetrical sector-shaped annular grooves (28) are arranged inside the support frame (14); the sector-shaped limiting shafts (27) are clamped with the sector-shaped annular grooves (28).

6. The lateral support device with mechanical and hydraulic locking structures according to claim 1, Characterized in that, the support frame (14) is in the shape of a closed cylindrical shape at one end, and a plurality of friction blocks (13) are evenly distributed circumferentially near the closed end, and a mandrel limiting chute (22) is arranged on the inner surface of the support frame (14) near the unclosed end.

7. The lateral support device with mechanical and hydraulic locking structures according to claim 6, Characterized in that, The inner wall surface of the friction block (13) in contact with the mandrel (1) is a convex arc surface; the contact surface between the support ring (12) and the friction block (13) is a wavy surface.

8. A locking and supporting method for a lateral support device with a mechanical and hydraulic locking structure, using the lateral support device with a mechanical and hydraulic locking structure according to any one of claims 1-7, characterized in that it specifically includes the following steps: Step 1: Uniformly arrange and install several such underwater lateral support devices on the integrated hanger, then connect the hydraulic pipelines to the locking and unlocking liquid injection ports respectively, and make the hydraulic pipelines for each locking liquid injection in series to ensure that the pressure in the locking hydraulic cavity (25) of each support device is the same during the liquid injection process. Step 2: Hydraulic locking: Inject hydraulic pressure into the locking hydraulic cavity (25) to drive the piston (5) to move. The piston (5) will push the mandrel (1) to move, driving the friction block (13) and the support frame (14) to move in the locking direction. The support frame (14) is pushed out and contacts the suspension adapter, playing a role in supporting and locking. When the required locking pressure is reached, stop the liquid injection and release the pressure in the locking hydraulic cavity (25). The mandrel (1) realizes self-locking, and the locking and supporting of the underwater lateral support device is completed; Or: Mechanical locking: Control the ROV to loosen the mandrel nut (2) counterclockwise with a torque wrench to push the mandrel (1) to move in the locking direction. When the required locking force is reached, tighten the mandrel nut (2) in the reverse direction, and the mandrel (1) realizes self-locking, and the locking and supporting of the underwater lateral support device is completed.

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