Auxiliary fixing equipment for marine drilling riser

Abstract

The marine drilling riser fixing auxiliary equipment comprises a lifting assembly, the lifting assembly comprises a lifting base, a first through hole is formed in the lifting base, four steel cables and a riser are arranged in the first through hole in a penetrating mode, and a guide mechanism, a power mechanism and a brake mechanism are arranged on the lifting base; the rotating assembly comprises a rotating base, the rotating base is rotationally connected to the lifting base, a regulation and control mechanism is arranged between the rotating base and the lifting base, and a second through hole is formed in the rotating base; the fixing auxiliary assembly comprises a shell, the shell is fixedly connected to the rotating base, two third through holes are formed in the shell, a first thrust mechanism is arranged in the shell, and an automatic steering mechanism and a second thrust mechanism are arranged outside the shell. According to the device, the marine riser can be pushed, bending of the marine riser is reduced, the position of the marine riser in water can be conveniently adjusted according to the bending portion of the marine riser, meanwhile, the operation direction can be adjusted, and therefore the service life of the marine riser is guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of watertight pipe fixing auxiliary equipment, and in particular to an ocean drilling watertight pipe fixing auxiliary equipment. Background Art

[0002] The marine drilling riser is a core component connecting the offshore drilling platform to the subsea wellhead. It performs crucial functions, including isolating the offshore water, maintaining pressure balance within the well, and guiding the circulation of drill tools and drilling fluid. Its role is particularly critical in deepwater and ultra-deepwater oil and gas development: on the one hand, the riser must withstand complex environmental loads such as seawater pressure and ocean currents; on the other hand, its vertical stability directly impacts the smoothness of the drill string and the lifespan of the wellhead equipment. As offshore oil and gas development extends to deeper waters, the length and weight of the riser have increased significantly, placing higher demands on the reliability of its fixtures.

[0003] Some devices in the existing technology fix the watertight pipe with rings or locking bolts, but lack a real-time correction mechanism, which causes the watertight pipe to gradually bend under the action of continuous external force, aggravating the friction and wear between the drill string and the pipe wall, and even causing structural damage to the pipe body.

[0004] Therefore, an auxiliary device for fixing a marine drilling riser is proposed to solve the above problems. Summary of the Invention

[0005] The purpose of the present invention is to provide an auxiliary device for fixing a marine drilling riser to solve the problems existing in the above-mentioned prior art, reduce the bending of the riser in seawater, and reduce the risk of damage to the drill string.

[0006] To achieve the above-mentioned object, the present invention provides the following solution: The present invention provides an auxiliary device for fixing a marine drilling riser, comprising:

[0007] A lifting assembly, comprising a lifting base, a first through hole being formed on the lifting base, four steel cables and a watertight riser being passed through the first through hole, one end of the steel cable being fixed to the seabed, and the other end of the steel cable being connected to the drilling platform, a guide mechanism, a power mechanism, and a brake mechanism being provided on the lifting base, and the steel cable passing through the brake mechanism;

[0008] A rotating assembly comprising a rotating base, the rotating base being rotatably connected to the lifting base, a regulating mechanism being provided between the rotating base and the lifting base, and a second through hole being provided on the rotating base, the second through hole being of the same size as the first through hole and being concentrically arranged;

[0009] A fixed auxiliary component includes an outer shell, which is fixedly connected to the rotating base. Two third through holes are provided on the outer shell. The third through holes are identical to and concentrically arranged with the second through holes. A first thrust mechanism is provided inside the outer shell, and the first thrust mechanism faces the watertight pipe. An automatic steering mechanism and a second thrust mechanism are provided outside the outer shell.

[0010] Preferably, the automatic steering mechanism includes a front cone block, a rear cone block and a tail fin plate, the front cone block and the rear cone block are both fixedly connected to the outer shell, the front cone block is on the water-facing side, and the rear cone block is on the water-receiving side, an extension rod is fixedly connected to the outer shell, the tail fin plate is fixedly connected to the extension rod, and the extension rod is located below the rear cone block.

[0011] Preferably, the first thrust mechanism includes a plurality of first hydraulic cylinders, the first hydraulic cylinders are fixedly connected in the housing, the output ends of the first hydraulic cylinders are rotatably connected to an arc-shaped top plate, and the plurality of first hydraulic cylinders are arranged in an up-and-down arrangement.

[0012] Preferably, the output end of the first hydraulic cylinder is fixedly connected to a baffle, the baffle is fixedly connected to a first connecting plate, the arc-shaped top plate is fixedly connected to a second connecting plate, the first connecting plate and the second connecting plate are rotatably connected, and a plurality of springs are fixedly connected between the baffle and the arc-shaped top plate, and the springs are located on both sides of the first connecting plate.

[0013] Preferably, the second thrust mechanism includes a propeller 1, a vertical rod is fixedly connected to the extension rod, and the propeller 1 is fixedly connected to the vertical rod.

[0014] Preferably, the power mechanism includes several propeller 2s and several propeller 3s, a first mounting seat is fixedly connected to the lifting base, and the propeller 2 is fixedly connected to the first mounting seat, and several second mounting seats are fixedly connected to the outer shell, and the propeller 3 is fixedly connected to the second mounting seat.

[0015] Preferably, the guide mechanism includes a plurality of guide tubes, a plurality of support rods are fixedly connected to the lifting base, the guide tubes are fixedly connected to the support rods, the steel cables are passed through the guide tubes, and the braking mechanism is arranged on the support rods.

[0016] Preferably, the braking mechanism includes several annular friction plates, the support rod is fixedly connected to a connecting rod, the connecting rod is fixedly connected to a box body, the box body is provided with two fourth through holes, the box body is fixedly connected to several second hydraulic cylinders and several third hydraulic cylinders, the second hydraulic cylinder is fixedly connected to the top wall of the box body, the third hydraulic cylinder is fixedly connected to the bottom wall of the box body, the output end of the second hydraulic cylinder is fixedly connected to the first movable plate, the first movable plate is provided with a fifth through hole, a downward pressure cone ring is fixedly connected in the fifth through hole, the output end of the third hydraulic cylinder is fixedly connected to the second movable plate, the second movable plate is provided with a sixth through hole, the second movable plate is fixedly connected to the annular friction plate, the fourth through hole, the downward pressure cone ring and the annular friction plate are all concentrically arranged, and the steel cable passes through the downward pressure cone ring and the annular friction plate.

[0017] Preferably, the regulating mechanism includes a motor, the output end of the motor is fixedly connected to the first gear, the outer shell is fixedly connected to a protective cover, the protective cover is provided with a through hole, the output shaft of the motor extends out of the through hole, a slide groove is fixedly connected inside the protective cover, the motor is fixedly connected to the slider, the slider is slidably arranged in the slide groove, an electric telescopic rod is fixedly connected inside the protective cover, the electric telescopic rod is fixedly connected to the slider, a gear ring is fixedly connected to the lifting base, and the first gear ring is arranged corresponding to the gear ring.

[0018] Preferably, the lifting base and the rotating base are rotatably connected via bearings, and a plurality of cameras are fixedly connected inside the outer shell, and the cameras are facing the watertight pipe.

[0019] The present invention discloses the following technical effects:

[0020] 1. In this device, the steel cables are arranged around the wellhead. The power mechanism drives the lifting base to rise or fall along the cables. The guide mechanism enables the lifting base to move along the cables. The brake mechanism can keep the lifting base 1 in a fixed position, making it convenient for working on the riser.

[0021] 2. In this device, the rotating base rotates on the lifting base, so that the shell can adjust its direction. The regulating mechanism can regulate the direction. The automatic steering mechanism can make the shell automatically turn with the movement of the ocean current. The automatic steering mechanism and the regulating mechanism should not be used at the same time. The shell can be adjusted in direction by the automatic rotating mechanism first, and then the regulating mechanism can be used for precise adjustment.

[0022] 3. The first thrust mechanism in this device is used to push the riser to reduce the bending of the riser. The second thrust mechanism is used to push this device. The riser will bend with the movement of ocean currents in the ocean. This device can be moved to the bending part of the riser, and the riser can be pushed by the first thrust mechanism. During the pushing process, if the steel cable also bends with the riser, the second thrust mechanism can be started to push this device to reduce the bending of the riser.

[0023] This device can not only push the riser to reduce the bending of the riser, but also facilitate the adjustment of the position in the water according to the bending part of the riser, and can also adjust the operation direction, thereby ensuring the service life of the riser. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0025] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0026] Figure 2 Detailed structural diagram of the present invention;

[0027] Figure 3 This is a schematic structural diagram of the first hydraulic cylinder of the present invention;

[0028] Figure 4 for Figure 2 The enlarged schematic diagram of point a in the middle;

[0029] Figure 5 for Figure 2 The enlarged schematic diagram at point b in the middle;

[0030] Among them, 1. Lifting base; 2. First through hole; 3. Steel cable; 4. Riser; 5. Rotating base; 6. Shell; 7. Third through hole; 8. Front cone; 9. Rear cone; 10. Tail fin; 11. Extension rod; 12. First hydraulic cylinder; 13. Arc top plate; 14. Baffle; 15. First connecting plate; 16. Second connecting plate; 17. Spring; 18. Propeller 1; 19. Vertical rod; 20. Propeller 2; 21. Propeller 3; 22. First installation Seat; 23. Second mounting seat; 24. Support rod; 25. Guide tube; 26. Annular friction plate; 27. Connecting rod; 28. Box body; 29. Fourth through hole; 30. Second hydraulic cylinder; 31. Third hydraulic cylinder; 32. First movable plate; 33. Pressing cone ring; 34. Second movable plate; 35. Motor; 36. First gear; 37. Protective cover; 38. Slide groove; 39. Slider; 40. Electric telescopic rod; 41. Gear ring; 42. Bearing; 43. Camera. DETAILED DESCRIPTION

[0031] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only 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 making creative efforts are within the scope of protection of the present invention.

[0032] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0033] Reference Figure 1-5 The present invention provides an auxiliary device for fixing a marine drilling riser, comprising:

[0034] The lifting assembly includes a lifting base 1, a first through hole 2 is formed on the lifting base 1, four steel cables 3 and a watertight pipe 4 are passed through the first through hole 2, one end of the steel cable 3 is fixed to the seabed, and the other end of the steel cable 3 is connected to the drilling platform. The lifting base 1 is provided with a guide mechanism, a power mechanism and a brake mechanism, and the steel cables 3 pass through the brake mechanism;

[0035] The rotating assembly includes a rotating base 5, which is rotatably connected to the lifting base 1. A regulating mechanism is provided between the rotating base 5 and the lifting base 1. A second through hole is provided on the rotating base 5. The second through hole is the same size as the first through hole 2 and is concentrically arranged.

[0036] The fixed auxiliary component includes an outer shell 6, which is fixedly connected to the rotating base 5. Two third through holes 7 are provided on the outer shell 6. The third through holes 7 are identical to the second through holes and are concentrically arranged. A first thrust mechanism is arranged inside the outer shell 6, and the first thrust mechanism is directed toward the watertight pipe 4. An automatic steering mechanism and a second thrust mechanism are arranged outside the outer shell 6.

[0037] This device needs to be used in conjunction with four steel cables 3. The steel cables 3 are arranged around the wellhead. The power mechanism drives the lifting base 1 to rise or fall along the steel cables 3. The guide mechanism makes the lifting base 1 move along the steel cables 3. The braking mechanism can keep the lifting base 1 in a fixed position. The rotating base 5 rotates on the lifting base 1, so that the outer shell 6 can adjust its direction. The control mechanism can control the direction. The automatic steering mechanism can make the outer shell 6 automatically turn with the movement of the ocean current. The automatic steering mechanism and the control mechanism are not used at the same time. The watertight pipe 4 passes through this device. The first thrust mechanism is used to push the watertight pipe 4, and the second thrust mechanism is used to push this device. The watertight pipe 4 will bend with the movement of the ocean current in the ocean. This device can be moved to the bending point of the watertight pipe 4, and the watertight pipe 4 can be pushed by the first thrust mechanism. During the pushing process, if the steel cable 3 also bends with the watertight pipe 4, the second thrust mechanism can be started to push this device to reduce the bending of the watertight pipe 4.

[0038] A further optimized solution is provided, in which the automatic steering mechanism includes a front cone block 8, a rear cone block 9 and a tail fin plate 10. The front cone block 8 and the rear cone block 9 are both fixedly connected to the outer shell 6, with the front cone block 8 on the water-facing side and the rear cone block 9 on the water-receiving side. An extension rod 11 is fixedly connected to the outer shell 6, and the tail fin plate 10 is fixedly connected to the extension rod 11, which is located below the rear cone block 9.

[0039] The water flow hits the front cone block 8, and the front cone block 8 has a pointed end on the water-facing side, which can separate the water flow. The outer shell 6 is circular, the rear cone block 9 is located on the water-receiving side, and the extension rod 11 is relatively long. The ocean current hits the tail fin plate 10, which can make the device automatically turn, so that the front cone block 8 is always on the water-facing side. When the device automatically turns, the control mechanism does not work.

[0040] According to a further optimized solution, the first thrust mechanism includes a plurality of first hydraulic cylinders 12, which are fixedly connected in the housing 6, and the output end of the first hydraulic cylinder 12 is rotatably connected to the arc-shaped top plate 13, and the plurality of first hydraulic cylinders 12 are arranged in an upper and lower arrangement.

[0041] When the device moves to a suitable height, the first hydraulic cylinder 12 extends, and the annular top plate 13 comes into contact with the watertight pipe 4. As the first hydraulic cylinder 12 continues to extend, the curvature of the watertight pipe 4 gradually decreases.

[0042] To further optimize the solution, the output end of the first hydraulic cylinder 12 is fixedly connected to a baffle 14, a first connecting plate 15 is fixedly connected to the baffle 14, a second connecting plate 16 is fixedly connected to the arc-shaped top plate 13, the first connecting plate 15 and the second connecting plate 16 are rotatably connected, and a number of springs 17 are fixedly connected between the baffle 14 and the arc-shaped top plate 13, and the springs 17 are located on both sides of the first connecting plate 15.

[0043] The arc-shaped top plate 13 is rotatably connected to the baffle 14 through the rotational connection of the first connecting plate 15 and the second connecting plate 16. Two springs 17 are provided, one on the upper and one on the lower sides, so that the arc-shaped top plate 13 can maintain a vertical state. When the surface of the watertight pipe 4 is uneven, the arc-shaped top plate 13 can change its angle to prevent damage during the pushing process.

[0044] According to a further optimized solution, the second thrust mechanism includes a propeller 18 , a vertical rod 19 is fixedly connected to the extension rod 11 , and the propeller 18 is fixedly connected to the vertical rod 19 .

[0045] The thruster 18 is used to push this device. When the first hydraulic cylinder 12 pushes the watertight pipe 4, it encounters greater resistance and the steel cable 3 will also bend to a certain extent. At this time, the thruster 18 can be started. The thruster 18 pushes this device to move, so that the watertight pipe 4 reduces bending.

[0046] A further optimized solution is that the power mechanism includes several thruster twos 20 and several thruster threes 21. A first mounting seat 22 is fixedly connected to the lifting base 1, and thruster two 20 is fixedly connected to the first mounting seat 22. Several second mounting seats 23 are fixedly connected to the outer shell 6, and thruster three 21 is fixedly connected to the second mounting seat 23.

[0047] The first mounting seat 22 is used to mount the second propeller 20, and the second mounting seat 23 is used to mount the third propeller 21. The second propeller 20 can make the device rise, and the third propeller 21 can make the device fall.

[0048] A further optimized solution is that the guide mechanism includes a plurality of guide tubes 25, a plurality of support rods 24 are fixedly connected to the lifting base 1, the support rods 24 are fixedly connected to the guide tubes 25, the steel cables 3 are passed through the guide tubes 25, and the braking mechanism is arranged on the support rods 24.

[0049] The guide tube 25 enables the device to rise or fall along the wire rope 3 .

[0050] A further optimized solution is that the braking mechanism includes several annular friction plates 26, a connecting rod 27 is fixedly connected to the support rod 24, and a box body 28 is fixedly connected to the connecting rod 27. Two fourth through holes 29 are provided on the box body 28, and several second hydraulic cylinders 30 and several third hydraulic cylinders 31 are fixedly connected to the box body 28. The second hydraulic cylinder 30 is fixedly connected to the top wall of the box body 28, and the third hydraulic cylinder 31 is fixedly connected to the bottom wall of the box body 28. The output end of the second hydraulic cylinder 30 is fixedly connected to the first movable plate 32, and a fifth through hole is provided on the first movable plate 32. A downward pressure cone ring 33 is fixedly connected in the fifth through hole. The output end of the third hydraulic cylinder 31 is fixedly connected to the second movable plate 34, and a sixth through hole is provided on the second movable plate 34. The annular friction plate 26 is fixedly connected to the second movable plate 34. The fourth through hole 29, the downward pressure cone ring 33 and the annular friction plate 26 are all concentrically arranged, and the steel cable 3 passes through the downward pressure cone ring 33 and the annular friction plate 26.

[0051] The annular friction plate 26 is made of flexible and wear-resistant material. The second hydraulic cylinder 30 is used to push the first movable plate 32. Several second hydraulic cylinders 30 move simultaneously. The third hydraulic cylinder 31 is used to push the second movable plate 34. Several third hydraulic cylinders 31 move simultaneously. When it is necessary to make the device stay at a certain position, start the second hydraulic cylinder 30 and the third hydraulic cylinder 31, the first movable plate 32 pushes the downward pressing cone ring 33 downward, and the second movable plate 34 pushes the annular friction plate 26 upward. The downward pressing cone ring 33 will press on the annular friction plate 26, so that the annular friction plate 26 contacts the steel cable 3. As the downward pressing cone ring 33 is continuously squeezed, the annular friction plate 26 is tightly fitted with the steel cable 3 and friction is generated, so that the device stays at a predetermined position. The annular friction plate 26 and the downward pressing cone ring 33 are both trumpet-shaped.

[0052] To further optimize the solution, the control mechanism includes a motor 35, the output end of the motor 35 is fixedly connected to the first gear 36, the outer shell 6 is fixedly connected to a protective cover 37, the protective cover 37 is provided with a through hole, the output shaft of the motor 35 extends out of the through hole, the protective cover 37 is fixedly connected to a slide 38, the motor 35 is fixedly connected to the slider 39, the slider 39 is slidably set in the slide 38, the protective cover 37 is fixedly connected to the electric telescopic rod 40, the electric telescopic rod 40 is fixedly connected to the slider 39, the lifting base 1 is fixedly connected to a gear ring 41, and the first gear 36 and the gear ring 41 are correspondingly arranged.

[0053] The slider 39 can slide in the slide groove 38. The slider 39 can be moved by the electric telescopic rod 40, thereby moving the motor 35. The movement of the motor 35 can move the first gear 36, thereby engaging or separating the first gear 36 with the gear ring 41.

[0054] When the regulating mechanism needs to work, the electric telescopic rod 40 is extended, and the electric telescopic rod 40 drives the slider 39 to move, and the slider 39 drives the first gear 36 to move and engage with the gear ring 41. When the regulating mechanism does not need to work, the first gear 36 and the gear ring 41 can be separated.

[0055] To further optimize the solution, the lifting base 1 and the rotating base 5 are rotatably connected via a bearing 42 , and a plurality of cameras 43 are fixedly connected inside the outer shell 6 , with the cameras 43 facing the watertight pipe 4 .

[0056] The camera 43 facilitates observation of the working process.

[0057] The working principle of this device is that when it is necessary to move this device in seawater, start thruster 20 or thruster 3 21, thruster 2 20 can make this device rise, and thruster 3 21 can make this device fall; when this device needs to stay at a predetermined position, start the second hydraulic cylinder 30 and the third hydraulic cylinder 31, the second hydraulic cylinder 30 pushes the first movable plate 32, and the third hydraulic cylinder 31 pushes the second movable plate 34, the first movable plate 32 pushes the downward pressing cone ring 33 downward, and the second movable plate 34 pushes the annular friction plate 26 upward, and the downward pressing cone ring 33 will press on the annular friction plate 26, so that the annular friction plate 26 contacts the steel cable 3, and as the downward pressing cone ring 33 is continuously squeezed, the annular friction plate 26 is tightly fitted with the steel cable 3 and generates friction, so that this device stays at the predetermined position.

[0058] First, the direction is adjusted by the automatic rotation mechanism. At this time, the first gear 36 and the gear ring 41 remain separated, and the ocean current impacts the tail fin 10. At the same time, under the action of the front cone block 8 and the rear cone block 9, the shell 6 automatically rotates. When the direction is stable, the electric telescopic rod 40 is started. The electric telescopic rod 40 moves the slider 39, thereby moving the motor 35. The movement of the motor 35 moves the first gear 36, so that the first gear 36 engages with the gear ring 41. At this time, the direction of the shell 6 can be adjusted again by the motor 35. Before starting to push the watertight pipe 4, the direction is adjusted to the optimal position, and the first hydraulic cylinder 12 is started. The first hydraulic cylinder 12 extends, and the annular top plate 13 will contact the watertight pipe 4. As the first hydraulic cylinder 12 continues to extend, the curvature of the watertight pipe 4 gradually decreases. When the first hydraulic cylinder 12 pushes the watertight pipe 4, it encounters a large resistance, and the steel cable 3 will also bend to a certain extent. At this time, the thruster 18 can be started, and the thruster 18 pushes the device to move, so that the curvature of the watertight pipe 4 is reduced.

[0059] In the description of the present invention, it should be understood that the terms "longitudinal", "transverse", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0060] The embodiments described above are merely descriptions of preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Without departing from the spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by persons skilled in the art should fall within the scope of protection defined by the claims of the present invention.

Claims

1. An auxiliary device for fixing a marine drilling riser, characterized in that: include: A lifting assembly, comprising a lifting base (1), a first through hole (2) being provided on the lifting base (1), four steel cables (3) and a watertight pipe (4) being passed through the first through hole (2), one end of the steel cable (3) being fixed to the seabed, and the other end of the steel cable (3) being connected to the drilling platform, a guide mechanism, a power mechanism and a brake mechanism being provided on the lifting base (1), and the steel cable (3) passing through the brake mechanism; A rotating assembly, comprising a rotating base (5), the rotating base (5) being rotatably connected to the lifting base (1), a regulating mechanism being provided between the rotating base (5) and the lifting base (1), a second through hole being provided on the rotating base (5), the second through hole being of the same size as the first through hole (2) and being concentrically arranged; A fixed auxiliary component, the fixed auxiliary component includes a shell (6), the shell (6) is fixedly connected to the rotating base (5), two third through holes (7) are provided on the shell (6), the third through holes (7) are identical to the second through holes and are concentrically arranged, a first thrust mechanism is arranged inside the shell (6), the first thrust mechanism is directed toward the watertight pipe (4), and an automatic steering mechanism and a second thrust mechanism are arranged outside the shell (6).

2. The marine drilling riser fixing auxiliary device according to claim 1, characterized in that: The automatic steering mechanism comprises a front cone block (8), a rear cone block (9) and a tail fin plate (10); the front cone block (8) and the rear cone block (9) are both fixedly connected to the housing (6); the front cone block (8) is located on the waterfront side, and the rear cone block (9) is located on the waterback side; an extension rod (11) is fixedly connected to the housing (6); the tail fin plate (10) is fixedly connected to the extension rod (11); and the extension rod (11) is located below the rear cone block (9).

3. The marine drilling riser fixing auxiliary device according to claim 1, characterized in that: The first thrust mechanism comprises a plurality of first hydraulic cylinders (12), wherein the first hydraulic cylinders (12) are fixedly connected in the housing (6), and an output end of the first hydraulic cylinder (12) is rotatably connected to an arc-shaped top plate (13), and the plurality of first hydraulic cylinders (12) are arranged in an upper and lower arrangement.

4. The marine drilling riser fixing auxiliary device according to claim 3, characterized in that: The output end of the first hydraulic cylinder (12) is fixedly connected to a baffle (14), a first connecting plate (15) is fixedly connected to the baffle (14), a second connecting plate (16) is fixedly connected to the arc-shaped top plate (13), the first connecting plate (15) and the second connecting plate (16) are rotatably connected, and a plurality of springs (17) are fixedly connected between the baffle (14) and the arc-shaped top plate (13), and the springs (17) are located on both sides of the first connecting plate (15).

5. The marine drilling riser fixing auxiliary device according to claim 2, characterized in that: The second thrust mechanism includes a propeller 1 (18), a vertical rod (19) is fixedly connected to the extension rod (11), and the propeller 1 (18) is fixedly connected to the vertical rod (19).

6. The marine drilling riser fixing auxiliary device according to claim 1, characterized in that: The power mechanism includes a plurality of propellers 2 (20) and a plurality of propellers 3 (21); a first mounting seat (22) is fixedly connected to the lifting base (1); the propellers 2 (20) are fixedly connected to the first mounting seat (22); a plurality of second mounting seats (23) are fixedly connected to the housing (6); the propellers 3 (21) are fixedly connected to the second mounting seats (23).

7. The marine drilling riser fixing auxiliary device according to claim 1, characterized in that: The guide mechanism comprises a plurality of guide tubes (25), a plurality of support rods (24) are fixedly connected to the lifting base (1), the guide tubes (25) are fixedly connected to the support rods (24), the steel cables (3) are passed through the guide tubes (25), and the braking mechanism is arranged on the support rods (24).

8. The marine drilling riser fixing auxiliary device according to claim 7, characterized in that: The braking mechanism comprises a plurality of annular friction plates (26), a connecting rod (27) is fixedly connected to the support rod (24), a box body (28) is fixedly connected to the connecting rod (27), two fourth through holes (29) are provided on the box body (28), a plurality of second hydraulic cylinders (30) and a plurality of third hydraulic cylinders (31) are fixedly connected to the box body (28), the second hydraulic cylinders (30) are fixedly connected to the top wall of the box body (28), the third hydraulic cylinders (31) are fixedly connected to the bottom wall of the box body (28), and the output end of the second hydraulic cylinder (30) is fixedly connected to the third hydraulic cylinder (31). A movable plate (32), wherein a fifth through hole is provided on the first movable plate (32), a downward pressing cone ring (33) is fixedly connected in the fifth through hole, a second movable plate (34) is fixedly connected to the output end of the third hydraulic cylinder (31), a sixth through hole is provided on the second movable plate (34), the annular friction plate (26) is fixedly connected to the second movable plate (34), the fourth through hole (29), the downward pressing cone ring (33) and the annular friction plate (26) are all concentrically arranged, and the steel cable (3) passes through the downward pressing cone ring (33) and the annular friction plate (26).

9. The marine drilling riser fixing auxiliary device according to claim 1, characterized in that: The regulating mechanism comprises a motor (35), an output end of the motor (35) is fixedly connected to a first gear (36), a protective cover (37) is fixedly connected to the housing (6), a through hole is provided on the protective cover (37), an output shaft of the motor (35) extends out of the through hole, a slide groove (38) is fixedly connected inside the protective cover (37), the motor (35) is fixedly connected to a slider (39), the slider (39) is slidably arranged in the slide groove (38), an electric telescopic rod (40) is fixedly connected inside the protective cover (37), the electric telescopic rod (40) is fixedly connected to the slider (39), a gear ring (41) is fixedly connected to the lifting base (1), and the first gear ring (41) is arranged corresponding to the gear ring (41).

10. The marine drilling riser fixing auxiliary device according to claim 1, characterized in that: The lifting base (1) and the rotating base (5) are rotatably connected via a bearing (42); a plurality of cameras (43) are fixedly connected inside the housing (6); and the cameras (43) face the watertight pipe (4).

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