Vertical pipe mounting device of ocean platform

Abstract

The invention relates to a vertical pipe mounting device of an ocean platform. The vertical pipe mounting device comprises a mounting seat body and a plurality of locking devices. The mounting base body is provided with a hollow mounting cavity, and the inner wall of the mounting cavity is used for being in friction fit with the peripheral wall of the vertical pipe. The multiple locking devices are arranged on the mounting base body at intervals in the circumferential direction. The locking device comprises a locking sleeve, a locking part, a transmission control assembly and a mechanical driving assembly. The locking sleeve is fixed to the mounting base body, and the locking part is arranged in the locking sleeve in a telescopic sliding mode and used for being inserted into a locking hole of the vertical pipe to lock the vertical pipe. The transmission control assembly is in driving connection with the locking part and used for driving the locking part to move through an external power source. And the mechanical driving assembly is in driving connection with the locking part and is used for manually driving the locking part to move. According to the vertical pipe mounting device, the situation that the vertical pipe is overturned and even unhooked in the mounting seat when a ship rolls under the extreme working condition of the ocean can be effectively avoided, and the safety and the reliability of a vertical pipe system in the using process under the ocean environment are guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of offshore platforms, and in particular to a riser installation device for an offshore platform. Background Art

[0002] Floating Production Storage and Offloading (FPSO) is a large-scale offshore oil production base that separates oil and gas from the extracted oil, treats oily wastewater, generates power, provides heat, and stores and transports crude oil products, and integrates personnel accommodation and production command systems. Compared with other forms of oil production platforms, FPSO has the advantages of strong wind and wave resistance, wide range of adaptability to water depths, large storage / unloading capacity, and transferability and reusability. It is widely suitable for the development of deep sea, shallow sea areas and marginal oil fields far from the coast, and has become the mainstream production method for offshore oil and gas field development.

[0003] On FPSO, the riser system is an important component for the transportation of water, oil, gas, etc. of FPSO. At present, the riser system of FPSO is usually installed on the mounting seat. The riser system relies on the friction between the cone stress joint of the riser and the contact surface of the mounting seat to prevent the riser from overturning under oil production and extreme environmental conditions to a certain extent, and avoid the riser from rotating and overturning in the mounting seat.

[0004] However, due to its high center of gravity, FPSO may heel or break anchor chains when encountering extreme winds and waves. At this time, the riser system has a very large inclination angle, and it is difficult to ensure the stability of its installation through friction. Summary of the invention

[0005] One purpose of the present invention is to solve the deficiencies in the prior art and provide a riser installation device for an offshore platform. To solve the above technical problems, the present invention adopts the following technical solutions:

[0006] A riser installation device for an offshore platform, comprising:

[0007] A mounting seat body, which is used to be fixed to the offshore platform. The mounting seat body is provided with a hollow mounting cavity, the inner wall of which is used to frictionally cooperate with the outer peripheral wall of the riser, so that the riser is relatively fixedly mounted on the mounting seat body;

[0008] A plurality of locking devices are arranged on the mounting seat body at intervals along the circumference of the riser, the locking devices comprising a locking sleeve, a locking part, a transmission control assembly and a mechanical drive assembly, the locking sleeve is fixed on the mounting seat body, the interior of the locking sleeve is hollow and can communicate with the mounting cavity, the locking part is telescopically and slidably arranged in the locking sleeve, and the locking part is used to be inserted into the locking hole of the riser to lock the riser;

[0009] The transmission control assembly is drivingly connected to the locking portion, and is used to drive the locking portion to move using an external power source, so that the locking portion switches between the position of inserting into or exiting the locking hole;

[0010] The mechanical driving assembly is drivingly connected to the locking part and is used for manually driving the locking part to move so that the locking part switches between the positions of inserting into or withdrawing from the locking hole.

[0011] In one embodiment, the locking portion includes a locking block, a linkage rod, a driving block and a first spring, the locking block is fixedly connected to one end of the linkage rod, the driving block is sleeved on the outer circumference of the linkage rod and can slide relative to the linkage rod, and the first spring is sleeved on the outer circumference of the linkage rod and connected between the locking block and the driving block;

[0012] The transmission control assembly is connected to the linkage rod to drive the linkage rod to slide in the locking sleeve. When the linkage rod moves, the locking block can be driven to move, so that the locking block can be inserted into or withdrawn from the locking hole.

[0013] The mechanical driving assembly is drivingly connected to the driving block to drive the driving block to slide in the locking sleeve. When the driving block moves, the locking block can be driven to move through the first spring, so that the locking block can be inserted into or withdrawn from the locking hole.

[0014] In one embodiment, the transmission control assembly includes a hydraulic cylinder, a piston, a drive rod, and a second spring, the hydraulic cylinder is connected to one end of the locking sleeve, the piston is slidably disposed in the hydraulic cylinder, the drive rod is connected to the piston and can extend out of the hydraulic cylinder to be connected to the linkage rod, and the second spring is disposed inside the hydraulic cylinder and abuts against the piston;

[0015] The piston is used to move in a direction away from the locking sleeve under the action of external hydraulic pressure, and drive the driving rod and the linkage rod to move, so that the locking block withdraws from the locking hole;

[0016] The second spring is used to drive the piston to move toward the locking sleeve when the external hydraulic pressure is withdrawn, so that the driving rod and the linkage rod can be reset and the locking block can be inserted into the locking hole.

[0017] In one embodiment, the hydraulic cylinder body includes a cylinder barrel, a first end cover and a second end cover, wherein the first end cover and the second end cover are respectively arranged at two ends of the cylinder barrel and are respectively sealed and connected to the cylinder barrel;

[0018] The first end cover is provided with a first through hole, and the second end cover is provided with a second through hole;

[0019] The piston includes a plug body and a cylinder body. The plug body is fixedly connected to the outer peripheral side wall of the cylinder body. The plug body is in sealing contact with the inner cavity wall of the cylinder. The two ends of the cylinder body are in sealing contact with the inner wall of the first through hole and the inner wall of the second through hole respectively. The drive rod is penetrated into the cylinder body and is detachably connected to the cylinder body.

[0020] In one embodiment, the transmission control assembly includes a first sealing ring, a second sealing ring, a third sealing ring, a fourth sealing ring and a fifth sealing ring;

[0021] The first sealing ring is arranged between the inner cavity wall of the cylinder and the first end cover, the second sealing ring is arranged between the inner cavity wall of the cylinder and the second end cover, the third sealing ring is arranged between the outer peripheral side wall of the plug body and the inner cavity wall of the cylinder, the fourth sealing ring is arranged between the outer peripheral side wall of the barrel and the inner wall of the first through hole, and the fifth sealing ring is arranged between the outer peripheral side wall of the barrel and the inner wall of the second through hole.

[0022] In one embodiment, the mechanical drive assembly includes a handle and a connecting shaft, one end of the connecting shaft is connected to the handle, and the other end is passed through the locking sleeve and connected to the driving block;

[0023] The handle is arranged on the side wall of the locking sleeve and can move relative to the locking sleeve under the action of external force, so as to drive the driving block to slide in the locking sleeve through the connecting shaft.

[0024] In one embodiment, the handle can be rotated eccentrically under the action of an external force to drive the drive block to slide back and forth in the locking sleeve through the connecting shaft.

[0025] In one embodiment, the handle includes a handle portion and an ear seat, the handle portion is fixedly connected to the ear seat, the ear seat is provided with a rotating hole, the rotating hole is eccentrically arranged on the ear seat, and the connecting shaft is rotatably arranged in the rotating hole;

[0026] A slide groove extending along the axial direction of the locking sleeve is provided on the side wall of the locking sleeve, and the connecting shaft is passed through the slide groove and connected to the driving block;

[0027] The handle portion can drive the ear seat to rotate eccentrically, and the eccentric rotation of the ear seat can drive the connecting shaft to slide in the slide groove, so that the driving block slides in the locking sleeve.

[0028] In one embodiment, the mounting seat body includes a mounting portion and a receiving portion connected vertically up and down, and both the mounting portion and the receiving portion are hollow structures and the insides of the two are connected;

[0029] The mounting cavity is formed inside the mounting portion, and a plurality of locking devices are arranged on the side wall of the mounting portion;

[0030] An accommodating cavity is formed inside the accommodating portion, the radial dimension of the lower end of the installation cavity is greater than the radial dimension of the upper end of the accommodating cavity, and an annular step surface can be formed between the installation cavity and the accommodating cavity, and the annular step surface is used to support the riser.

[0031] In one of the embodiments, the radial dimension of the installation cavity gradually decreases vertically from top to bottom.

[0032] In one embodiment, the radial dimension of the receiving cavity gradually increases vertically from top to bottom.

[0033] In one of the embodiments, a notch is provided on the side wall of the mounting seat body, the notch is communicated with the mounting cavity, and the notch is used for allowing the riser to enter the mounting cavity.

[0034] It can be seen from the above technical solution that the present invention has at least the following advantages and positive effects:

[0035] In the present invention, the riser installation device of the offshore platform includes a mounting seat body and a plurality of locking devices. The mounting seat body is used for initially limiting and fixing the riser, and the plurality of locking devices are used for locking and fixing the stress joint of the riser from multiple radial directions. Thus, the riser installation device can effectively prevent the riser from flipping or even unhooking in the mounting seat when the ship rolls under extreme marine conditions, thereby facilitating the safety and reliability of the riser system during use in a marine environment.

[0036] Moreover, the locking function of each locking device on the riser can be achieved not only through the transmission control component, but also through the mechanical drive component. Therefore, under different working conditions, the operator can choose different ways to lock or unlock the riser with the locking device, and when one of the locking methods fails, the locking can be achieved through another locking method. Therefore, the riser installation device has higher flexibility in use and higher reliability in use. Regardless of whether any locking method fails during FPSO production, the existence of another locking method enables the subsea riser production system to still produce oil, which is conducive to significantly increasing production and improving economic efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 It is a schematic diagram of the connection structure between the riser installation device of the offshore platform and the offshore platform according to the embodiment.

[0038] Figure 2 yes Figure 1 Schematic cross-section of AA in the structure shown.

[0039] Figure 3 yes Figure 2 The structure shown is a schematic diagram of the usage status with a riser installed.

[0040] Figure 4 is a cross-sectional schematic diagram of the locking device in a locked state according to the embodiment.

[0041] Figure 5 2 is a schematic cross-sectional view of the locking device according to the embodiment in a hydraulically unlocked state.

[0042] Figure 6 is a cross-sectional schematic diagram of the locking device according to the embodiment in a manually unlocked state.

[0043] Figure 7 2 is a schematic diagram of the overall structure of the locking device according to the embodiment.

[0044] Figure 8 yes Figure 7 The structure shown is a partial cross-sectional schematic diagram at the handle.

[0045] Fig. 9 yes Figure 7 Schematic diagram of the overall structure of the handle of the structure shown.

[0046] Fig.10 yes Fig. 9 Schematic diagram of the structure shown along direction B

[0047] The following are the descriptions of the reference numerals:

[0048] 10-offshore platform; 20-riser; 201-locking hole; 202-stress joint;

[0049] 100-mounting seat body;

[0050] 110 - installation cavity; 120 - installation portion; 130 - receiving portion; 131 - receiving cavity; 140 - annular step surface; 150 - notch;

[0051] 200-locking device;

[0052] 210-locking sleeve; 211-sliding groove;

[0053] 220-locking part; 221-locking block; 222-linking rod; 223-driving block; 224-first spring; 225-righting block;

[0054] 230-transmission control assembly; 231-hydraulic cylinder body; 232-cylinder barrel; 233-first end cover; 234-second end cover; 235-piston; 236-plug body; 237-cylinder body; 238-driving rod; 239-second spring;

[0055] 2311-first sealing ring; 2312-second sealing ring; 2313-third sealing ring; 2314-fourth sealing ring; 2315-fifth sealing ring;

[0056] 240-mechanical drive assembly; 241-handle; 242-handle portion; 243-ear seat; 244-rotating hole; 245-connecting shaft;

[0057] 250 - Mounting plate. DETAILED DESCRIPTION

[0058] Typical embodiments that embody the features and advantages of the present invention will be described in detail in the following description. It should be understood that the present invention can have various changes in different embodiments without departing from the scope of the present invention, and the descriptions and illustrations therein are essentially used for illustration purposes rather than for limiting the present invention.

[0059] In the description of the present application, it should be understood that in the embodiments shown in the drawings, the indications of directions or positional relationships (such as up, down, left, right, front and back, etc.) are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the devices or elements referred to must have a specific orientation, be constructed and operate in a specific orientation. These descriptions are appropriate when these elements are in the positions shown in the drawings. If the descriptions of the positions of these elements change, the indications of these directions also change accordingly.

[0060] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0061] The application provides a riser installation device for an offshore platform, wherein the offshore platform may be an offshore floating production storage and offloading platform FPSO (Floating Production Storage and Offloading). The riser installation device is mainly used to install and fix the riser system of the offshore platform. The riser system generally includes a riser body and a stress joint 202, and the stress joint 202 is fixedly connected to the riser body. The riser body is used to realize the transportation of fluids such as oil and gas, and the stress joint 202 is used to cooperate with an external mounting structure to realize the overall installation and fixation of the riser system.

[0062] Based on this, the riser 20 mentioned in the following embodiments of the present application should be understood as a riser system. The installation device mainly cooperates with the stress joint 202 of the riser 20 to achieve the installation and locking of the entire riser system.

[0063] The specific embodiment of the riser installation device of the offshore platform 10 of the present application will be described in detail below with reference to the accompanying drawings.

[0064] See also Figure 1As shown, the riser installation device of the offshore platform 10 according to an embodiment of the present invention comprises a mounting seat body 100 and a plurality of locking devices 200. The mounting seat body 100 is used to be fixed to the offshore platform 10. For example, the mounting seat body 100 can be fixedly installed in the support area of ​​the riser 20 on the ship side of the offshore platform 10. The mounting seat body 100 can be made of cast steel material as a whole. The mounting seat body 100 can be welded and fixed to the hull.

[0065] like Figure 1 and Figure 2 As shown, a hollow installation cavity 110 is provided in the mounting seat body 100. The inner wall of the installation cavity 110 is used for frictional cooperation with the outer peripheral wall of the riser 20, so that the riser 20 is relatively fixedly installed on the mounting seat body 100. For example, the shape and size of the installation cavity 110 can be adapted to the outer size of the stress joint 202 of the riser system, so that the stress joint 202 can be tightly plugged into the installation cavity 110 of the mounting seat body 100.

[0066] See also Figure 2 In one embodiment, the mounting seat body 100 includes a mounting portion 120 and a receiving portion 130 connected vertically up and down, and the mounting portion 120 and the receiving portion 130 are both hollow structures and the insides of the two are connected. Among them, the mounting cavity 110 is formed inside the mounting portion 120, and the receiving cavity 131 is formed inside the receiving portion 130. The radial dimension of the lower end of the mounting cavity 110 is greater than the radial dimension of the upper end of the receiving cavity 131, and an annular step surface 140 for supporting the riser 20 can be formed between the two.

[0067] like Figure 3 As shown, when the riser 20 is installed on the mounting seat body 100, the outer periphery of the stress joint 202 of the riser 20 is in frictional contact with the inner wall of the mounting cavity 110, and the bottom end of the stress joint 202 abuts against the annular step surface 140, so that the riser 20 can be relatively fixedly installed in the mounting seat body 100. In addition, the riser body hanging from the bottom of the stress joint 202 can be accommodated in the accommodation cavity 131, and the accommodation cavity 131 can play a protective role and limit the lateral movement of the riser body to a certain extent, so as to avoid the situation where the riser body and the stress joint 202 are broken due to large stress.

[0068] Preferably, the radial dimension of the installation cavity 110 gradually decreases from top to bottom in the vertical direction. By designing the installation cavity 110 to be a cavity shape that is larger at the top and smaller at the bottom, when the stress joint 202 of the riser 20 is inserted into the installation cavity 110, the outer periphery of the stress joint 202 of the riser 20 can fit more closely with the inner wall of the installation cavity 110 under the action of gravity, so that the friction between the two is greater, which is conducive to maintaining the stability of the fixation of the riser 20.

[0069] Preferably, the radial dimension of the receiving cavity 131 gradually increases vertically from top to bottom. By designing the receiving cavity 131 to be a cavity shape that is small at the top and large at the bottom, when the stress joint 202 of the riser 20 is inserted into the installation cavity 110, the riser body hanging below the stress joint 202 can have a certain swing margin, which is conducive to ensuring the use flexibility of the riser 20 and facilitating the riser to transport fluids such as oil and gas.

[0070] like Figure 1 As shown, in one embodiment, a notch 150 is provided on the side wall of the mounting seat body 100, and the notch 150 communicates with the mounting cavity 110. The notch 150 is used for the riser 20 to enter the mounting cavity 110. By providing the notch 150, the installation and removal of the riser 20 can be facilitated.

[0071] In this embodiment, when the riser 20 is installed on the mounting seat body 100, the riser 20 as a whole can first be pulled by the lifting system to enter the mounting cavity 110 through the notch 150, and at this time, the stress joint 202 is located above the mounting seat body 100. Then the traction system drives the riser 20 down to the position where the bottom end of the stress joint 202 abuts against the annular step surface 140, and the riser 20 can be initially fixed to the mounting seat body 100. Then, the locking device 200 is used to lock and fix the riser 20 on the mounting seat body 100, and the details can be seen in the following description.

[0072] See also Figure 1 In the embodiment of the present application, a plurality of locking devices 200 are arranged on the mounting seat body 100 at intervals along the circumference of the riser 20. Thus, the plurality of locking devices 200 can lock and fix the riser 20 from multiple radial directions, thereby improving the installation reliability of the riser 20. Specifically, the plurality of locking devices 200 can be arranged on the side wall of the mounting portion 120 at intervals along the circumference to lock the stress joint 202 of the riser 20.

[0073] like Figure 4 As shown, the locking device 200 includes a locking sleeve 210, a locking portion 220, a transmission control assembly 230 and a mechanical drive assembly 240. The locking sleeve 210 is fixed on the mounting seat body 100, and the interior of the locking sleeve 210 is hollow and can communicate with the mounting cavity 110.

[0074] For example, a mounting groove having an inner diameter matching the outer circumferential surface of the locking sleeve 210 may be provided on the circumferential side wall of the mounting seat body 100, and the mounting groove communicates with the mounting cavity 110. One end of the locking sleeve 210 can be inserted into the mounting groove, and the interior thereof communicates with the mounting cavity 110. Then, the locking sleeve 210 and the mounting seat body 100 are welded at the assembly location.

[0075] The locking portion 220 is telescopically and slidably disposed in the locking sleeve 210, and the locking portion 220 is used to be inserted into the locking hole 201 of the stand pipe 20 to lock the stand pipe 20. Figure 4 As shown, in one embodiment, the locking portion 220 includes a locking block 221, a linkage rod 222, a driving block 223 and a first spring 224. The locking block 221 is used to be directly inserted into the locking hole 201 of the vertical pipe 20 to achieve locking and fixing of the vertical pipe 20.

[0076] Specifically, the locking block 221 is fixedly connected to one end of the linkage rod 222. Therefore, the locking block 221 can be extended out of the locking sleeve 210 under the drive of the linkage rod 222 to be inserted into the locking hole 201 of the riser 20; or, the locking block 221 can be retracted under the drive of the linkage rod 222 to exit the locking hole 201 of the riser 20. It should be noted here that the way in which the linkage rod 222 drives the locking block 221 to move will be described in detail below.

[0077] The driving block 223 is sleeved on the outer circumference of the linkage rod 222 and can slide relative to the linkage rod 222. The first spring 224 is sleeved on the outer circumference of the linkage rod 222 and connected between the locking block 221 and the driving block 223. Therefore, the locking block 221 can also extend out of the locking sleeve 210 under the drive of the driving block 223 and the first spring 224 to be inserted into the locking hole 201 of the stand pipe 20; or, the locking block 221 can be retracted under the drive of the driving block 223 and the first spring 224 and exit the locking hole 201 of the stand pipe 20. It should be noted here that the manner in which the driving block 223 and the first spring 224 drive the locking block 221 to move will be described in detail below.

[0078] The first spring 224 can be a compression spring with a relatively large stiffness, for example, it can be made of 718 alloy material. The performance of the first spring 224 needs to meet the requirements that it can ensure that the locking block 221 can effectively extend out of the locking sleeve 210 and ensure that the locking block 221 can be reliably inserted into the locking hole 201 of the stand pipe 20; at the same time, the first spring 224 also needs to have the elasticity to ensure that the locking block 221 can smoothly retract.

[0079] like Figure 4 As shown, in one embodiment, the locking portion 220 further includes a straightening block 225, which is disposed on the first spring 224 and is used to maintain the correct position and posture of the first spring 224. By providing the straightening block 225, the first spring 224 can be effectively prevented from being offset during operation, and the first spring 224 can be helped to maintain its proper shape.

[0080] See also Figure 4 and Figure 5In the embodiment of the present application, the transmission control assembly 230 is drivingly connected to the locking portion 220, so as to drive the locking portion 220 to move using an external power source, so that the locking portion 220 switches between the positions of inserting into or exiting the locking hole 201. Specifically, the transmission control assembly 230 can be drivingly connected to the linkage rod 222 to drive the linkage rod 222 to slide in the locking sleeve 210. When the linkage rod 222 moves, it can drive the locking block 221 to move, so that the locking block 221 can be inserted into or exited from the locking hole 201.

[0081] like Figure 4 As shown, in one embodiment, the transmission control assembly 230 includes a hydraulic cylinder 231, a piston 235, a driving rod 238, and a second spring 239. The hydraulic cylinder 231 is connected to one end of the locking sleeve 210. The piston 235 is slidably disposed in the hydraulic cylinder 231. The driving rod 238 is connected to the piston 235 and can extend out of the hydraulic cylinder 231 and be connected to the linkage rod 222. The second spring 239 is disposed inside the hydraulic cylinder 231 and abuts against the piston 235.

[0082] like Figure 5 As shown, the piston 235 is used to move away from the locking sleeve 210 under the action of external hydraulic pressure, and drive the driving rod 238 and the linkage rod 222 to move, so that the locking block 221 withdraws from the locking hole 201. Figure 4 As shown, the second spring 239 is used to drive the piston 235 to move toward the locking sleeve 210 when the external hydraulic pressure is removed, so that the driving rod 238 and the linkage rod 222 can be reset, and the locking block 221 can be inserted into the locking hole 201.

[0083] like Figure 4 As shown, the hydraulic cylinder body 231 can be connected to the locking sleeve 210 through a mounting plate 250. For example, the mounting plate 250 and the locking sleeve 210 are fixedly connected by a set of bolts. Figure 7 As shown, the mounting plate 250 and the hydraulic cylinder body 231 are fixedly connected by another set of bolts. Therefore, the hydraulic cylinder body 231 is fixedly connected to the locking sleeve 210 by the mounting plate 250.

[0084] It should be noted that if Figure 4 As shown, in the present application, the locking device 200 is in a normal state, and the locking block 221 is extended outward, that is, the locking device 200 is in a locked state. At this time, the piston 235 and the driving rod 238 are both in the initial position, and the second spring 239 is in a normal state.

[0085] like Figure 4As shown, the hydraulic cylinder 231 can be a single-acting cylinder, that is, the pressure oil can be simultaneously introduced to the left and right sides of the piston 235 in the hydraulic cylinder 231 through the same pipeline. Specifically, when the pressure oil is introduced into the hydraulic cylinder 231, due to the different force surfaces on the left and right sides of the piston 235, the right side of the piston 235 is subjected to greater force, so that the oil pressure drives the piston 235 to move leftward, and the driving rod 238 and the linkage rod 222 move leftward accordingly, so that the locking block 221 moves leftward and retracts and can exit the locking hole 201. For details, see Figure 5 shown.

[0086] It is understood that in other embodiments, the hydraulic cylinder 231 may be a double-acting cylinder, that is, pressure oil may be introduced into the left and right sides of the piston 235 in the hydraulic cylinder 231 through two pipelines. For example, when the piston 235 needs to move to the left, oil may be introduced into the right side of the piston 235 through the oil inlet pipeline at the right end of the hydraulic cylinder 231, depending on the specific situation.

[0087] like Figure 4 and Figure 5 As shown, for example, the second spring 239 can be a compression spring. One end of the second spring 239 abuts against the piston 235, and the other end abuts against the hydraulic cylinder 231. When the external hydraulic pressure acts on the piston 235 and causes the piston 235 to move to the left, the second spring 239 is compressed and accumulates elastic force. When the external hydraulic pressure is removed, the elastic force accumulated by the second spring 239 can drive the piston 235 to move rightward and reset, so that the driving rod 238 and the linkage rod 222 can also be reset, thereby allowing the locking block 221 to extend outward and be inserted into the locking hole 201.

[0088] The second spring 239 may be a compression spring with a relatively large stiffness, for example, it may be made of 718 alloy material. The performance of the second spring 239 needs to satisfy that it can exert a strong elastic force on the piston 235, ensuring that the piston 235 reliably moves to the right and resets, and ensuring that the locking block 221 effectively extends out of the locking sleeve 210. At the same time, the elastic performance of the second spring 239 also needs to ensure that the piston 235 can smoothly move to the left when subjected to hydraulic pressure, so as to drive the locking block 221 to retract.

[0089] like Figure 4 As shown, in one embodiment, the hydraulic cylinder body 231 may include a cylinder barrel 232, a first end cover 233 and a second end cover 234, wherein the first end cover 233 and the second end cover 234 are respectively disposed at both ends of the cylinder barrel 232 and are respectively sealed and connected to the cylinder barrel 232. The mounting plate 250 and the hydraulic cylinder body 231 are fixedly connected by another set of bolts, and specifically, the mounting plate 250 and the first end cover 233 of the hydraulic cylinder body 231 are fixedly connected by bolts.

[0090] like Figure 4 As shown, a portion of the first end cover 233 can be tightly inserted into the cylinder barrel 232, and another portion of the first end cover 233 protrudes from the cylinder barrel 232. A portion of the second end cover 234 can also be tightly inserted into the cylinder barrel 232, and another portion of the second end cover 234 protrudes from the cylinder barrel 232. Finally, the portion of the first end cover 233 protruding from the cylinder barrel 232 and the portion of the second end cover 234 protruding from the cylinder barrel 232 can be fixedly connected by a set of long bolts. Thus, the first end cover 233 and the second end cover 234 are sealed and fixedly connected to the cylinder barrel 232.

[0091] like Figure 4 As shown, a first through hole is formed on the first end cover 233, and a second through hole is formed on the second end cover 234. The piston 235 includes a plug body 236 and a barrel body 237, and the plug body 236 is fixedly connected to the outer peripheral side wall of the barrel body 237. The plug body 236 is in sealing contact with the inner cavity wall of the cylinder barrel 232, and the two ends of the barrel body 237 are in sealing contact with the inner wall of the first through hole and the inner wall of the second through hole respectively. By such an arrangement, it is conducive to achieving a sealed connection between the hydraulic cylinder body 231 itself and the piston 235, so as to achieve the purpose of driving the piston 235 to move by oil pressure.

[0092] Further, see Figure 4 As shown, in one embodiment, the transmission control assembly 230 further includes a plurality of sealing rings. The plurality of sealing rings include a first sealing ring 2311 disposed between the inner cavity wall of the cylinder 232 and the first end cover 233. Figure 4 As shown, the number of the first sealing rings 2311 can be two, and the two first sealing rings 2311 can be arranged side by side along the axial direction of the cylinder 232 to achieve a double sealing effect, which can be determined according to specific circumstances.

[0093] The plurality of sealing rings also include a second sealing ring 2312 disposed between the inner wall of the cylinder 232 and the second end cover 234. Figure 4 As shown, the number of the second sealing rings 2312 can be two, and the two second sealing rings 2312 can be arranged side by side along the axial direction of the cylinder 232 to achieve a double sealing effect, which can be determined according to the specific situation.

[0094] The plurality of sealing rings further includes a third sealing ring 2313 disposed between the outer peripheral side wall of the plug body 236 and the inner cavity wall of the cylinder 232. Figure 4 As shown, the number of the third sealing rings 2313 can be two, and the two third sealing rings 2313 can be arranged side by side along the radial direction of the cylinder 232 to achieve a double sealing effect, which can be determined according to the specific situation.

[0095] The plurality of sealing rings further includes a fourth sealing ring 2314 disposed between the outer peripheral side wall of the barrel portion 237 and the inner wall of the first through hole. Figure 4 As shown, three groups of fourth sealing rings 2314 may be provided, and the number of fourth sealing rings 2314 in each group may be one or two or more. The three groups of fourth sealing rings 2314 may be arranged at intervals along the axial direction of the cylinder 232 to achieve multiple sealing effects. The multiple fourth sealing rings 2314 in each group may be arranged side by side along the axial direction or radial direction of the cylinder 232 to achieve multiple sealing effects, depending on the specific situation.

[0096] The plurality of sealing rings also include four or five sealing rings disposed between the outer peripheral side wall of the barrel portion 237 and the inner wall of the second through hole. Figure 4 As shown, the fifth sealing ring 2315 can be provided in three groups, and the number of the fifth sealing ring 2315 in each group can be one or two or more. The three groups of fifth sealing rings 2315 can be arranged at intervals along the axial direction of the cylinder 232 to achieve multiple sealing effects. The multiple fifth sealing rings 2315 in each group can be arranged side by side along the axial direction or radial direction of the cylinder 232 to achieve multiple sealing effects, which can be determined according to the specific situation.

[0097] like Figure 4 As shown, the driving rod 238 is disposed in the barrel portion 237 and is detachably connected to the barrel portion 237. Specifically, the driving rod 238 includes a first rod body and a second rod body connected to each other, the first rod body is disposed in the barrel portion 237, and the second rod body can extend outward and is detachably fixedly connected to the linkage rod 222. The size of the end portion where the first rod body is connected to the second rod body is larger than the size of the end portion of the second rod body. Thus, an annular end face can be formed between the first rod body and the second rod body, and the annular end face can abut against the right end of the barrel portion 237.

[0098] Therefore, when the transmission control assembly 230 needs to be disassembled, the first end cover 233 and the mounting plate 250 are disassembled from each other, the linkage rod 222 and the driving rod 238 are disassembled, and then the driving rod 238 can slide to the left relative to the piston 235 and be removed from the second end cover 234 of the hydraulic cylinder body 231, while the position of the piston 235 remains unchanged. Therefore, by setting the driving rod 238 and the piston 235 as a detachable connection, the disassembly and assembly of the driving rod 238 in the transmission control assembly 230 can be facilitated, thereby facilitating the disassembly and assembly and maintenance of the transmission control assembly 230.

[0099] The transmission control assembly 230 of the embodiment of the present application can reliably insert or withdraw the locking block 221 into or out of the locking hole 201 through the cooperation of the hydraulic cylinder 231, the piston 235, the driving rod 238 and the second spring 239. Figure 5As shown, when external hydraulic pressure acts on piston 235, piston 235 will move leftward and drive driving rod 238 to move leftward, thereby driving linkage rod 222 to move leftward, so that locking block 221 is retracted into the locking sleeve. At this time, the stress joint 202 of the riser 20 and the mounting seat body 100 can be easily disassembled and installed.

[0100] like Figure 4 As shown, when the external hydraulic pressure is withdrawn, under the elastic force of the second spring 239, the piston 235 can move to the right and reset, thereby releasing space for the drive rod 238 to move to the right, so that the drive rod 238 can move to the right and reset under the drive of the linkage rod 222 and the first spring 224. At the same time, the locking block 221 can extend outward and insert into the locking hole 201 to achieve locking and fixation of the standpipe 20.

[0101] Therefore, the transmission control assembly 230 of the present application can reliably realize the insertion or withdrawal of the locking block 221 into the locking hole 201, and it is simple to operate and easy to use. At the same time, since it uses the second spring 239 to drive the piston 235 to reset to realize the insertion of the locking block 221 into the locking hole 201 for locking, and the external hydraulic pressure is only used to drive the piston 235 to move and drive the locking block 221 to withdraw from the locking hole 201. Therefore, when the locking device 200 is in a long-term locked use state, the transmission control assembly 230 of the present application can avoid the long-term use of hydraulic pressure to ensure the locking function of the locking device 200, avoid the risk of failure of the locking function of the locking device 200 due to failure of the hydraulic system, thereby increasing the reliability and safety of the locking device 200.

[0102] At the same time, the transmission control assembly 230 is used in a relatively harsh marine and seawater environment. Its hydraulic cylinder body 231 and drive rod 238 and other components can be made of special corrosion-resistant materials and coated with special corrosion-resistant coatings. In addition, the transmission control assembly 230 also adopts a cathode protection method to ensure that its design service life exceeds 30 years. And through such a setting, it can also prevent marine organisms from adhering to the surface and internal groove structure of the transmission control assembly 230, ensuring that the movement of each moving part in the transmission control assembly 230 is not hindered. Multiple rows and multiple numbers of sealing rings are arranged at the connection contact surfaces of each component in the hydraulic cylinder body 231, which can greatly ensure the tightness function of the hydraulic system from low to high pressure range.

[0103] See also Figure 4In the embodiment of the present application, the mechanical driving assembly 240 is drivingly connected to the locking portion 220, so as to manually drive the locking portion 220 to move, so as to switch the locking portion 220 between the positions of inserting into or withdrawing from the locking hole 201. Specifically, the mechanical driving assembly 240 is drivingly connected to the driving block 223, so as to drive the driving block 223 to slide in the locking sleeve 210. When the driving block 223 moves, it can drive the locking block 221 to move through the first spring 224, so that the locking block 221 can be inserted into or withdrawn from the locking hole 201.

[0104] like Figure 4 , Figure 7 and Figure 8 As shown, in one embodiment, the mechanical driving assembly 240 includes a handle 241 and a connecting shaft 245, one end of the connecting shaft 245 is connected to the handle 241, and the other end is passed through the locking sleeve 210 and connected to the driving block 223. The handle 241 is provided on the side wall of the locking sleeve 210 and can move relative to the locking sleeve 210 under the action of an external force, so as to drive the driving block 223 to slide in the locking sleeve 210 through the connecting shaft 245.

[0105] For example, in the embodiment of the present application, the handle 241 can rotate eccentrically under the action of external force to drive the driving block 223 to slide back and forth in the locking sleeve 210 through the connecting shaft 245. Thereby, the locking block 221 can extend outward and insert into the locking hole 201 or retract and exit the locking hole 201.

[0106] Specifically, Fig. 9 and Fig.10 As shown, the handle 241 includes a handle portion 242 and an ear seat 243 . The handle portion 242 is fixedly connected to the ear seat 243 . The ear seat 243 is provided with a rotating hole 244 . The rotating hole 244 is eccentrically arranged on the ear seat 243 . The connecting shaft 245 is rotatably arranged in the rotating hole 244 .

[0107] The side wall of the locking sleeve 210 is provided with a slide groove 211 extending along the axial direction of the locking sleeve 210, and the connecting shaft 245 is inserted into the slide groove 211 and connected to the driving block 223. The handle portion 242 can drive the ear seat 243 to rotate eccentrically, and the eccentric rotation of the ear seat 243 can drive the connecting shaft 245 to slide in the slide groove 211, so that the driving block 223 slides in the locking sleeve 210.

[0108] In this embodiment, the locking block 221 can be reliably inserted into or withdrawn from the locking hole 201 through the cooperation between the handle 241 and the connecting shaft 245. Figure 4 As shown, in the normal state of the locking device 200, the locking block 221 is extended outward. At this time, the handle 241 and the driving block 223 are both in the initial position, and the first spring 224 is in a normal state. Figure 6As shown, when the handle 241 is bent to the left, the handle 241 rotates eccentrically and drives the connecting shaft 245 to move to the left, so that the driving block 223 connected to the connecting shaft 245 moves to the left. At this time, the driving block 223 can pull the locking block 221 to move to the left through the first spring 224, so that the locking block 221 exits the locking hole 201 and retracts into the locking sleeve.

[0109] When the locking block 221 is retracted, when the handle 241 is pushed to the right, the handle 241 rotates eccentrically and drives the connecting shaft 245 to move to the right, thereby causing the driving block 223 to move to the right. At this time, the driving block 223 can push the locking block 221 to move to the right through the first spring 224 and extend out of the locking sleeve 210 so as to be inserted into the locking hole 201 of the vertical pipe 20. Figure 4 shown.

[0110] Therefore, the mechanical drive assembly 240 of the present application can reliably realize the insertion or withdrawal of the locking block 221 into the locking hole 201, and its operation is simple and convenient to use. In addition, the direct driving of the driving block 223 can be realized by manually operating the handle 241, and the locking block 221 can be driven to perform telescopic movement, which can avoid the situation where the locking device 200 fails due to the failure of external power in an emergency. Therefore, the mechanical drive assembly 240 can ensure that the function of the locking device 200 does not fail, thereby increasing the reliability and safety of the locking device 200.

[0111] It should be noted that, in the embodiment of the present application, the handle 241 can rotate eccentrically under the action of an external force to drive the drive block 223 to slide left and right in the locking sleeve 210, so that the locking block 221 can extend outward and insert into the locking hole 201 or retract and exit the locking hole 201. By setting the handle 241 to rotate eccentrically to drive the drive block 223 to move, its structure is more compact and the design is more ingenious. However, the present application is not limited to this. In other embodiments, the handle 241 can also be moved to the right under the action of an external force, thereby driving the drive block 223 to move to the right, so that the locking block 221 extends outward and inserts into the locking hole 201; or the handle 241 can be moved to the left under the action of an external force, thereby driving the drive block 223 to move to the left, so that the locking block 221 retracts and exits the locking hole 201, which can be determined according to the specific situation.

[0112] It should be noted that in the present application, the transmission control assembly 230 and the mechanical drive assembly 240 do not operate completely independently. In some scenarios where manual operation is inconvenient, such as underwater working conditions, when the riser 20 needs to be installed in the mounting seat body 100, in order to avoid manual operation, the locking block 221 can be driven to retract by the transmission control assembly 230. At this time, the piston 235 of the transmission control assembly 230 can move to the left under the action of external hydraulic pressure, and will drive the drive rod 238, the linkage rod 222 and the locking block 221 to move to the left together, thereby retracting the locking block 221. At the same time, since the handle 241 and the drive block 223 of the mechanical drive assembly 240 are both in the initial position, the first spring 224 will be compressed and accumulate elastic force.

[0113] When the stand pipe 20 is installed in the mounting seat body 100, the external hydraulic pressure is removed, and the piston 235 will move rightward and reset under the action of the second spring 239, and can make room for the driving rod 238 to move rightward and reset. At the same time, the locking block 221 and the linkage rod 222 will move rightward and reset under the elastic force of the first spring 224, and the locking block 221 can extend out of the locking sleeve and insert into the locking hole 201 to achieve locking and fixing of the stand pipe 20. At the same time, the linkage rod 222 will drive the driving rod 238 to move rightward and reset. In other words, in the present application, the transmission control component 230 driving the locking block 221 to extend requires the cooperation of the mechanical driving component 240.

[0114] Of course, in some scenarios that are convenient for direct manual operation, the locking device 200 of the present application can also directly drive the locking block 221 to extend and retract by rotating the handle 241, so as to achieve locking or unlocking of the vertical pipe 20 by the locking device 200.

[0115] The riser installation device of the offshore platform of the embodiment of the present application comprises a mounting seat body and a plurality of locking devices. The mounting seat body is used for preliminarily limiting and fixing the riser, and the plurality of locking devices are used for locking and fixing the stress joint of the riser from multiple radial directions. Thus, the riser installation device can effectively prevent the riser from flipping over or even unhooking in the mounting seat when the ship rolls over under extreme marine conditions, thereby facilitating the safety and reliability of the riser system during use in a marine environment.

[0116] The offshore platform riser installation device of the embodiment of the present application solves the problem of deflection or even the risk of falling off when the seabed riser is fixed on the mounting seat under extreme capsizing of the FPSO or severe sea conditions. It also solves the problem of excessive stress on the pipeline connected thereto.

[0117] In the offshore platform riser installation device of the embodiment of the present application, the locking function of the locking device on the riser can be achieved not only by the transmission control component, but also by the mechanical drive component. Therefore, under different working conditions, the operator can choose different ways to lock or unlock the riser by the locking device, and when one of the locking methods fails, the locking can be achieved by another locking method. Therefore, the use flexibility of the riser installation device is higher and its use reliability is stronger.

[0118] The offshore platform riser installation device of the embodiment of the present application is designed with a locking device in two operating modes: manual and hydraulic, which realizes the locking of the load-bearing casing of the underwater rigid riser. In addition, the mechanical and hydraulic locking methods are safer and more reliable. Regardless of whether any locking method fails during FPSO production, the existence of the other locking method enables the submarine riser production system to still produce oil, thereby significantly increasing production and improving economic efficiency.

[0119] The above embodiments are merely exemplary descriptions of the structures. The structures in the embodiments are not fixed combination structures. In the absence of structural conflicts, the structures in multiple embodiments can be used in any combination.

[0120] Although the present invention has been described with reference to several typical embodiments, it should be understood that the terms used are illustrative and exemplary, rather than restrictive. Since the present invention can be embodied in a variety of forms without departing from the spirit or essence of the invention, it should be understood that the above embodiments are not limited to any of the foregoing details, but should be interpreted broadly within the spirit and scope defined by the appended claims, so all changes and modifications falling within the scope of the claims or their equivalents should be covered by the appended claims.

Claims

1. A riser installation device for an offshore platform, characterized in that: include: A mounting seat body, which is used to be fixed to the offshore platform, the mounting seat body is provided with a hollow mounting cavity, the inner wall of the mounting cavity is used to frictionally cooperate with the outer peripheral wall of the riser, so that the riser is relatively fixedly mounted on the mounting seat body; A plurality of locking devices are arranged on the mounting seat body at intervals along the circumference of the riser, the locking devices comprising a locking sleeve, a locking part, a transmission control assembly and a mechanical drive assembly, the locking sleeve is fixed on the mounting seat body, the interior of the locking sleeve is hollow and can communicate with the mounting cavity, the locking part is telescopically and slidably arranged in the locking sleeve, and the locking part is used to be inserted into the locking hole of the riser to lock the riser; The transmission control assembly is drivingly connected to the locking portion, and is used to drive the locking portion to move using an external power source, so that the locking portion switches between the position of inserting into or exiting the locking hole; The mechanical drive assembly is drivingly connected to the locking portion to manually drive the locking portion to move, so that the locking portion switches between the position of being inserted into or withdrawn from the locking hole.

2. The riser installation device for an offshore platform according to claim 1, characterized in that: The locking part comprises a locking block, a linkage rod, a driving block and a first spring, wherein the locking block is fixedly connected to one end of the linkage rod, the driving block is sleeved on the outer circumference of the linkage rod and can slide relative to the linkage rod, and the first spring is sleeved on the outer circumference of the linkage rod and connected between the locking block and the driving block; The transmission control assembly is drivingly connected to the linkage rod to drive the linkage rod to slide in the locking sleeve. When the linkage rod moves, it can drive the locking block to move, so that the locking block can be inserted into or withdrawn from the locking hole; The mechanical drive assembly is drivingly connected to the drive block to drive the drive block to slide in the locking sleeve. When the drive block moves, the locking block can be driven to move by the first spring, so that the locking block can be inserted into or withdrawn from the locking hole.

3. The riser installation device for an offshore platform according to claim 2, characterized in that: The transmission control assembly includes a hydraulic cylinder, a piston, a drive rod, and a second spring. The hydraulic cylinder is connected to one end of the locking sleeve. The piston is slidably disposed in the hydraulic cylinder. The drive rod is connected to the piston and can extend out of the hydraulic cylinder to be connected to the linkage rod. The second spring is disposed inside the hydraulic cylinder and abuts against the piston. The piston is used to move in a direction away from the locking sleeve under the action of external hydraulic pressure, and drive the driving rod and the linkage rod to move, so that the locking block withdraws from the locking hole; The second spring is used to drive the piston to move toward the locking sleeve when the external hydraulic pressure is removed, so that the driving rod and the linkage rod can be reset and the locking block can be inserted into the locking hole.

4. The riser installation device for an offshore platform according to claim 3, characterized in that: The hydraulic cylinder body comprises a cylinder barrel, a first end cover and a second end cover, wherein the first end cover and the second end cover are respectively arranged at two ends of the cylinder barrel and are respectively sealed and connected to the cylinder barrel; The first end cover is provided with a first through hole, and the second end cover is provided with a second through hole; The piston includes a plug body portion and a barrel portion, the plug body portion is fixedly connected to the outer peripheral side wall of the barrel portion, the plug body portion is in sealing contact with the inner cavity wall of the cylinder, the two ends of the barrel portion are in sealing contact with the inner wall of the first through hole and the inner wall of the second through hole respectively, and the driving rod is penetrated in the barrel portion and is detachably connected to the barrel portion.

5. The riser installation device for an offshore platform according to claim 4, characterized in that: The transmission control assembly includes a first sealing ring, a second sealing ring, a third sealing ring, a fourth sealing ring and a fifth sealing ring; The first sealing ring is arranged between the inner cavity wall of the cylinder and the first end cover, the second sealing ring is arranged between the inner cavity wall of the cylinder and the second end cover, the third sealing ring is arranged between the outer peripheral side wall of the plug body and the inner cavity wall of the cylinder, the fourth sealing ring is arranged between the outer peripheral side wall of the barrel and the inner wall of the first through hole, and the fifth sealing ring is arranged between the outer peripheral side wall of the barrel and the inner wall of the second through hole.

6. The riser installation device for an offshore platform according to claim 2, characterized in that: The mechanical drive assembly comprises a handle and a connecting shaft, one end of the connecting shaft is connected to the handle, and the other end is passed through the locking sleeve and connected to the driving block; The handle is arranged on the side wall of the locking sleeve and can move relative to the locking sleeve under the action of external force, so as to drive the driving block to slide in the locking sleeve through the connecting shaft.

7. The riser installation device for an offshore platform according to claim 6, characterized in that: The handle can rotate eccentrically under the action of external force, so as to drive the driving block to slide reciprocatingly in the locking sleeve through the connecting shaft.

8. The riser installation device for an offshore platform according to claim 7, characterized in that: The handle comprises a handle portion and an ear seat, wherein the handle portion is fixedly connected to the ear seat, the ear seat is provided with a rotation hole, the rotation hole is eccentrically arranged on the ear seat, and the connecting shaft is rotatably arranged in the rotation hole; A slide groove extending along the axial direction of the locking sleeve is provided on the side wall of the locking sleeve, and the connecting shaft is passed through the slide groove and connected to the driving block; The handle portion can drive the ear seat to rotate eccentrically, and the eccentric rotation of the ear seat can drive the connecting shaft to slide in the sliding groove, so that the driving block can slide in the locking sleeve.

9. The riser installation device for an offshore platform according to claim 1, characterized in that: The mounting seat body comprises a mounting portion and a receiving portion connected vertically up and down, wherein both the mounting portion and the receiving portion are hollow structures and the insides of the two are connected; The installation cavity is formed inside the installation portion, and a plurality of locking devices are arranged on the side wall of the installation portion; An accommodating cavity is formed inside the accommodating portion, the radial dimension of the lower end of the installation cavity is greater than the radial dimension of the upper end of the accommodating cavity, and an annular step surface can be formed between the installation cavity and the accommodating cavity, and the annular step surface is used to support the riser.

10. The riser installation device for an offshore platform according to claim 1 or 9, characterized in that: The radial dimension of the installation cavity gradually decreases vertically from top to bottom.

11. The riser installation device for an offshore platform according to claim 9, characterized in that: The radial dimension of the receiving cavity gradually increases vertically from top to bottom.

12. The riser installation device for an offshore platform according to claim 1, characterized in that: A notch is provided on the side wall of the mounting seat body, the notch is communicated with the mounting cavity, and the notch is used for allowing the riser to enter the mounting cavity.

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