Riser installation apparatus for offshore platforms

Abstract

The present application relates to a kind of riser installation device of offshore platform, including mounting seat body and multiple locking devices.Installation seat body is provided with hollow installation cavity, and the inner wall of installation cavity is used to be frictionally engaged with the outer wall of riser.Multiple locking devices are arranged on installation seat body in the circumferential direction.The locking device includes locking sleeve, locking part, transmission control assembly and mechanical drive assembly.Locking sleeve is fixed on installation seat body, and locking part is arranged in locking sleeve in a telescopic sliding manner, and is used to be inserted into the locking hole of riser to lock riser.Transmission control assembly is drivingly connected with locking part, to drive locking part to move using external power source.Mechanical drive assembly is drivingly connected with locking part, to manually drive locking part to move.The riser installation device can effectively avoid the situation that riser overturns or even unhooked in installation seat when ship tilts in extreme marine conditions, to ensure the safety and reliability of riser system during use in marine environment.

Description

Technical Field

[0001] This invention relates to the field of marine platform technology, and in particular to a riser installation device for marine platforms. Background Technology

[0002] Floating Production Storage and Offloading (FPSO) units are large-scale, integrated offshore oil production bases that separate oil and gas, treat oily wastewater, generate electricity and heat, store and transport crude oil products, and integrate personnel living quarters and production command systems. Compared with other types of oil production platforms, FPSOs have advantages such as strong resistance to wind and waves, wide adaptability to water depths, large storage / offloading capacity, and portability and reusability. They are widely suitable for the development of deep-sea, shallow-sea, and marginal oil fields far from the coast and have become the mainstream production method for offshore oil and gas field development.

[0003] In an FPSO, the riser system is a crucial component for transporting water, oil, and gas. Currently, FPSO riser systems are typically mounted on mounting bases. The riser system relies on the friction between the riser's tapered stress joint and the mounting base surface to prevent the riser from overturning during oil production and extreme environmental conditions, and to avoid the riser rotating or tipping over within the mounting base.

[0004] However, due to its high center of gravity, FPSOs are prone to tilting or anchor chain breakage in extreme winds and waves. In such situations, the riser system tilts at a very large angle, making it difficult to maintain installation stability through friction. Summary of the Invention

[0005] One objective of this invention is to overcome the shortcomings of the prior art and provide a riser installation device for offshore platforms. To solve the above-mentioned technical problems, this invention adopts the following technical solution:

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

[0007] The mounting base body is used to fix it to the offshore platform. The mounting base body has a hollow mounting cavity. The inner wall of the mounting cavity is used to frictionally engage with the outer peripheral wall of the riser so that the riser is relatively fixedly installed on the mounting base body.

[0008] Multiple locking devices are spaced apart on the mounting base body along the circumference of the riser. Each locking device includes a locking sleeve, a locking part, a transmission control component, and a mechanical drive component. The locking sleeve is fixed on the mounting base body. The interior of the locking sleeve is hollow and can communicate with the mounting cavity. The locking part is telescopically and slidably disposed inside the locking sleeve. The locking part is used to insert into the locking hole of the riser to lock the riser.

[0009] The transmission control component is driven and connected to the locking part to drive the locking part to move using an external power source, thereby switching the locking part between the positions of inserting into or retracting from the locking hole;

[0010] The mechanical drive assembly is connected to the locking part for manually driving the locking part to switch between inserting and withdrawing the locking part from the locking hole.

[0011] In one embodiment, the locking part 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 periphery of the linkage rod and can slide relative to the linkage rod, and the first spring is sleeved on the outer periphery of the linkage rod and connected between the locking block and the driving block.

[0012] The transmission control component is connected to the linkage rod drive to drive the linkage rod to slide inside 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 removed from the locking hole.

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

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

[0015] The piston is used to move away from the locking sleeve under external hydraulic pressure, and drive the drive rod and linkage rod to move so that the locking block is disengaged from the locking hole;

[0016] The second spring is used to drive the piston toward the locking sleeve when the external hydraulic pressure is removed, so that the drive rod and 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 cap, and a second end cap, which are respectively disposed at both ends of the cylinder barrel and are respectively sealed to the cylinder barrel.

[0018] The first end cap has a first through hole, and the second end cap has a second through hole;

[0019] The piston includes a piston body and a cylinder body. The piston body is fixedly connected to the outer peripheral side wall of the cylinder body and is in sealed contact with the inner wall of the cylinder. The two ends of the cylinder body are in sealed contact with the inner walls of the first through hole and the second through hole, respectively. The drive rod passes through 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 disposed between the inner wall of the cylinder and the first end cap; the second sealing ring is disposed between the inner wall of the cylinder and the second end cap; the third sealing ring is disposed between the outer peripheral side wall of the plug body and the inner wall of the cylinder; the fourth sealing ring is disposed between the outer peripheral side wall of the cylinder body and the inner wall of the first through hole; and the fifth sealing ring is disposed between the outer peripheral side wall of the cylinder body 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 which is connected to the handle and the other end of which passes through a locking sleeve and is connected to a drive block.

[0023] The handle is located 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 drive block to slide inside the locking sleeve through the connecting shaft.

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

[0025] In one embodiment, the handle includes a handle portion and an ear seat, the handle portion being fixedly connected to the ear seat, the ear seat having a rotating hole eccentrically located on the ear seat, and the connecting shaft being rotatably located within the rotating hole.

[0026] A groove extending axially along the side wall of the locking sleeve is provided, and the connecting shaft passes through the groove and is connected to the drive block.

[0027] The handle 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 drive block can slide in the locking sleeve.

[0028] In one embodiment, the mounting body includes a mounting portion and a receiving portion connected vertically upwards and downwards, both of which are hollow structures and are internally connected.

[0029] The mounting cavity is formed inside the mounting part, and multiple locking devices are provided on the side wall of the mounting part;

[0030] The interior of the receiving section forms a receiving cavity. The radial dimension of the lower end of the mounting cavity is greater than the radial dimension of the upper end of the receiving cavity. An annular stepped surface can be formed between the mounting cavity and the receiving cavity. The annular stepped surface is used to support the riser.

[0031] In one embodiment, the radial dimension of the mounting 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 embodiment, a notch is provided on the side wall of the mounting base body, and the notch communicates with the mounting cavity, allowing the riser to enter the mounting cavity.

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

[0035] In this invention, the riser installation device for an offshore platform includes a mounting base body and multiple locking devices. The mounting base body is used for initial positioning and fixing of the riser, while the multiple locking devices are used to lock and fix the stress joints of the riser from multiple radial directions. Therefore, this riser installation device can effectively prevent the riser from flipping or even disengaging within the mounting base when the ship rolls under extreme marine conditions, thus helping to ensure the safety and reliability of the riser system during use in a marine environment.

[0036] Furthermore, the locking function of each locking device on the riser can be achieved not only through the transmission control components but also through the mechanical drive components. Therefore, under different operating conditions, operators can choose different methods to lock or unlock the riser, and if one locking method fails, another can be used to lock it. This makes the riser installation device more flexible and reliable. Regardless of whether any locking method fails during FPSO production, the existence of another locking method allows the subsea riser production system to continue producing oil, thus significantly increasing output and improving economic efficiency. Attached Figure Description

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

[0038] Figure 2 yes Figure 1 A cross-sectional view of AA in the structure shown.

[0039] Figure 3 yes Figure 2 The diagram shows the structure in use with the riser installed.

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

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

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

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

[0044] Figure 8 yes Figure 7 The diagram shows a partial cross-sectional view of the structure at the handle.

[0045] Figure 9 yes Figure 7 A schematic diagram of the overall structure of the handle shown.

[0046] Figure 10 yes Figure 9 A schematic diagram of the structure shown, viewed along direction B.

[0047] The annotations in the attached figures are explained as follows:

[0048] 10 - Offshore platform; 20 - Riser; 201 - Locking hole; 202 - Stress joint;

[0049] 100 - Mounting base body;

[0050] 110 - Mounting cavity; 120 - Mounting section; 130 - Receiving section; 131 - Receiving cavity; 140 - Annular stepped surface; 150 - Notch;

[0051] 200 - Locking device;

[0052] 210 - Locking sleeve; 211 - Slide groove;

[0053] 220 - Locking part; 221 - Locking block; 222 - Linkage rod; 223 - Drive block; 224 - First spring; 225 - Straightening block;

[0054] 230 - Transmission control assembly; 231 - Hydraulic cylinder body; 232 - Cylinder barrel; 233 - First end cap; 234 - Second end cap; 235 - Piston; 236 - Plug body; 237 - Cylinder body; 238 - Drive 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 section; 243 - Ear seat; 244 - Rotary hole; 245 - Connecting shaft;

[0057] 250 - Mounting plate. Detailed Implementation

[0058] Typical embodiments embodying 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 variations in different embodiments without departing from the scope of the present invention, and the descriptions and illustrations herein are for illustrative purposes only and not intended to limit the present invention.

[0059] In the description of this application, it should be understood that, in the embodiments shown in the accompanying drawings, the indications of direction or positional relationships (such as up, down, left, right, front, and back) are merely for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. These descriptions are appropriate when these elements are in the positions shown in the accompanying drawings. If the description of the positions of these elements changes, these directional indications also change accordingly.

[0060] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0061] The riser installation device provided in this application is for offshore platforms, where the offshore platform can be a floating production storage and offloading (FPSO) platform. The riser installation device is mainly used for installing and securing the riser system of the offshore platform. The riser system typically includes a riser body and a stress joint 202, which is fixedly connected to the riser body. The riser body is used to transport fluids such as oil and gas, and the stress joint 202 is used to cooperate with external installation structures to achieve the overall installation and fixation of the riser system.

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

[0063] The following will describe in detail the specific embodiments of the riser installation device for the offshore platform 10 of this application with reference to the accompanying drawings.

[0064] Please see Figure 1As shown, the riser installation device for an offshore platform 10 according to an embodiment of the present invention includes a mounting base body 100 and a plurality of locking devices 200. The mounting base body 100 is used to fix it to the offshore platform 10. For example, the mounting base body 100 can be fixedly installed in the support area of ​​the riser 20 on the hull side of the offshore platform 10. The mounting base body 100 can be made entirely of cast steel. The mounting base body 100 can be welded to the hull.

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

[0066] See Figure 2 In one embodiment, the mounting body 100 includes a mounting portion 120 and a receiving portion 130 connected vertically. Both the mounting portion 120 and the receiving portion 130 are hollow structures and are internally connected. A mounting cavity 110 is formed inside the mounting portion 120, and a receiving cavity 131 is formed inside the receiving portion 130. The radial dimension of the lower end of the mounting cavity 110 is larger than the radial dimension of the upper end of the receiving cavity 131, and an annular stepped surface 140 for supporting the riser 20 can be formed between them.

[0067] like Figure 3 As shown, when the riser 20 is installed onto the mounting base 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 stepped surface 140, thereby allowing the riser 20 to be relatively fixedly installed within the mounting base body 100. Furthermore, the riser body hanging from the bottom of the stress joint 202 can be accommodated within the receiving cavity 131. The receiving cavity 131 provides protection and, to a certain extent, restricts the lateral movement of the riser body, preventing breakage due to excessive stress between the riser body and the stress joint 202.

[0068] Preferably, the radial dimension of the mounting cavity 110 gradually decreases from top to bottom along the vertical direction. By designing the mounting cavity 110 as 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 mounting cavity 110, the outer periphery of the stress joint 202 of the riser 20 can fit more tightly with the inner wall of the mounting cavity 110 under the action of gravity, resulting in greater friction between the two, which is beneficial to maintaining the stability of the riser 20.

[0069] Preferably, the radial dimension of the receiving cavity 131 gradually increases from top to bottom vertically. By designing the receiving cavity 131 as a cavity shape that is smaller at the top and larger at the bottom, when the stress joint 202 of the riser 20 is inserted into the mounting cavity 110, the riser body hanging below the stress joint 202 can have a certain swing margin, which helps to ensure the flexibility of the riser 20 in use and facilitates the transport of fluids such as oil and gas by the riser.

[0070] like Figure 1 As shown, in one embodiment, a notch 150 is provided on the side wall of the mounting base body 100, and the notch 150 communicates with the mounting cavity 110. The notch 150 is used to allow 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 onto the mounting base body 100, the riser 20 as a whole is first pulled into the mounting cavity 110 through the notch 150 by the lifting system. At this time, the stress joint 202 is located above the mounting base 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, so that the riser 20 can be initially fixed onto the mounting base body 100. Then, the locking device 200 is used to lock and fix the riser 20 onto the mounting base body 100, as described below.

[0072] See Figure 1 In the embodiments of this application, a plurality of locking devices 200 are arranged at intervals along the circumference of the riser 20 on the mounting base body 100. Thus, the plurality of locking devices 200 can lock and fix the riser 20 from multiple radial directions, improving the installation reliability of the riser 20. Specifically, the plurality of locking devices 200 may be arranged at intervals along the circumference on the side wall of the mounting portion 120 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 part 220, a transmission control assembly 230, and a mechanical drive assembly 240. The locking sleeve 210 is fixed to the mounting base 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 with an inner diameter that matches the outer circumferential surface of the locking sleeve 210 can be formed on the circumferential side wall of the mounting base body 100. This mounting groove communicates with the mounting cavity 110. One end of the locking sleeve 210 can be inserted into the mounting groove, and its interior communicates with the mounting cavity 110. Then, the locking sleeve 210 and the mounting base body 100 are welded at the assembly point.

[0075] The locking part 220 is telescopically and slidably disposed within the locking sleeve 210, and the locking part 220 is used to insert into the locking hole 201 of the riser 20 to lock the riser 20. Figure 4 As shown, in one embodiment, the locking part 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 directly insert into the locking hole 201 of the riser 20 to lock and fix the riser 20.

[0076] Specifically, the locking block 221 is fixedly connected to one end of the linkage rod 222. Therefore, the locking block 221 can extend out of the locking sleeve 210 under the action of the linkage rod 222 to insert into the locking hole 201 of the riser 20; or, the locking block 221 can retract under the action of the linkage rod 222 and exit the locking hole 201 of the riser 20. It should be noted that the manner in which the linkage rod 222 drives the locking block 221 will be explained in detail below.

[0077] The drive block 223 is sleeved on the outer periphery of the linkage rod 222 and can slide relative to the linkage rod 222. The first spring 224 is sleeved on the outer periphery of the linkage rod 222 and connected between the locking block 221 and the drive block 223. Therefore, the locking block 221 can also extend out of the locking sleeve 210 under the drive of the drive block 223 and the first spring 224 to insert into the locking hole 201 of the riser 20; or, the locking block 221 can retract under the drive of the drive block 223 and the first spring 224 and exit the locking hole 201 of the riser 20. It should be noted that the way the drive 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 high stiffness, for example, it can be made of 718 alloy material. The performance of the first spring 224 needs to ensure that the locking block 221 extends forcefully out of the locking sleeve 210 and that the locking block 221 is reliably inserted into the locking hole 201 of the riser 20; at the same time, the first spring 224 also needs to have the elasticity to ensure that the locking block 221 can retract smoothly.

[0079] like Figure 4 As shown, in one embodiment, the locking part 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, it is possible to effectively prevent the first spring 224 from shifting position during operation and to help the first spring 224 maintain its proper shape.

[0080] See Figure 4 and Figure 5In the embodiments of this application, the transmission control component 230 is driven to connect with the locking part 220, thereby using an external power source to drive the locking part 220 to move, and thus switching the locking part 220 between the positions of insertion and withdrawal from the locking hole 201. Specifically, the transmission control component 230 can be driven to connect with the linkage rod 222, so as to drive the linkage rod 222 to slide within 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 withdrawn 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 drive 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 within the hydraulic cylinder 231. The drive rod 238 is connected to the piston 235 and can extend out of the hydraulic cylinder 231 to connect with 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, piston 235 is used to move away from locking sleeve 210 under external hydraulic pressure, and drive drive rod 238 and linkage rod 222 to move, so that locking block 221 exits locking hole 201. Figure 4 As shown, the second spring 239 is used to drive the piston 235 toward the locking sleeve 210 when the external hydraulic pressure is removed, so that the drive 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 via 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 through the mounting plate 250.

[0084] It should be noted that, as Figure 4 As shown in this application, in normal operation, the locking block 221 of the locking device 200 extends outward, meaning the locking device 200 is in a locked state. At this time, the piston 235 and the drive rod 238 are both in their initial positions, and the second spring 239 is in its normal configuration.

[0085] like Figure 4As shown, the hydraulic cylinder 231 can be a single-acting cylinder, meaning that pressurized oil can be simultaneously supplied to both sides of the piston 235 within the hydraulic cylinder 231 through the same pipeline. Specifically, when pressurized oil is supplied to the hydraulic cylinder 231, due to the different force-bearing surfaces on the left and right sides of the piston 235, the right side of the piston 235 experiences greater force. This oil pressure drives the piston 235 to move to the left, causing the drive rod 238 and linkage rod 222 to move to the left, thus causing the locking block 221 to move to the left and retract, allowing it to exit the locking hole 201. See [link to details] for further information. Figure 5 As shown.

[0086] It is understood that in other embodiments, the hydraulic cylinder 231 can be a double-acting cylinder, that is, pressurized oil can be supplied to the left and right sides of the piston 235 inside the hydraulic cylinder 231 through two pipelines. For example, when the piston 235 needs to move to the left, oil can be supplied to 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 external hydraulic pressure acts on the piston 235, causing 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 to the right and reset, so that the drive rod 238 and the linkage rod 222 can also reset, thereby allowing the locking block 221 to extend outward and be inserted into the locking hole 201.

[0088] The second spring 239 can be a compression spring with high stiffness, for example, it can be made of 718 alloy material. The performance of the second spring 239 needs to be able to apply a strong elastic force to the piston 235, ensuring that the piston 235 reliably moves to the right and returns to its original position, and ensuring that the locking block 221 extends forcefully out of the locking sleeve 210. At the same time, the elastic properties of the second spring 239 also need to ensure that the piston 235 can move smoothly 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 cap 233, and a second end cap 234. The first end cap 233 and the second end cap 234 are respectively disposed at both ends of the cylinder barrel 232 and are respectively sealed to the cylinder barrel 232. The mounting plate 250 mentioned above is fixedly connected to the hydraulic cylinder body 231 by another set of bolts; specifically, the mounting plate 250 and the first end cap 233 of the hydraulic cylinder body 231 are fixedly connected by bolts.

[0090] like Figure 4 As shown, a portion of the first end cap 233 can be tightly inserted into the cylinder 232, while another portion of the first end cap 233 protrudes outside the cylinder 232. Similarly, a portion of the second end cap 234 can also be tightly inserted into the cylinder 232, with another portion of the second end cap 234 protruding outside the cylinder 232. Finally, the portions of the first end cap 233 and the second end cap 234 protruding outside the cylinder 232 can be securely connected using a set of long bolts. This achieves a sealed and fixed connection between the first end cap 233, the second end cap 234, and the cylinder 232.

[0091] like Figure 4 As shown, a first through hole is provided on the first end cap 233, and a second through hole is provided on the second end cap 234. The piston 235 includes a plug body portion 236 and a cylinder portion 237. The plug body portion 236 is fixedly connected to the outer peripheral side wall of the cylinder portion 237. The plug body portion 236 is in sealing contact with the inner wall of the cylinder 232, and the two ends of the cylinder portion 237 are in sealing contact with the inner walls of the first through hole and the second through hole, respectively. This arrangement facilitates the sealing connection between the hydraulic cylinder 231 itself and the piston 235, thereby achieving the purpose of hydraulically driving the piston 235 to move.

[0092] Further, see Figure 4 As shown, in one embodiment, the transmission control assembly 230 further includes multiple sets of sealing rings. The multiple sets of sealing rings include a first sealing ring 2311 disposed between the inner wall of the cylinder 232 and the first end cap 233. (See diagram below.) Figure 4 As shown, there can be two first sealing rings 2311. 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 the situation.

[0093] The multiple sets 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. For example... Figure 4 As shown, there can be two second sealing rings 2312. 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 multiple sets of sealing rings also include a third sealing ring 2313 disposed between the outer peripheral sidewall of the plug body 236 and the inner cavity wall of the cylinder 232. For example... Figure 4 As shown, there can be two third sealing rings 2313. 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 situation.

[0095] The multiple sealing rings also include a fourth sealing ring 2314 disposed between the outer peripheral sidewall of the cylindrical portion 237 and the inner wall of the first through hole. For example... Figure 4 As shown, three sets of fourth sealing rings 2314 can be provided, and each set can contain one, two, or more fourth sealing rings 2314. The three sets of fourth sealing rings 2314 can 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 set can be arranged side by side along the axial or radial direction of the cylinder 232 to achieve multiple sealing effects, depending on the specific situation.

[0096] The multiple sets of sealing rings also include four or five sealing rings disposed between the outer peripheral sidewall of the cylindrical part 237 and the inner wall of the second through hole. For example... Figure 4 As shown, three sets of fifth sealing rings 2315 can be provided, and each set can contain one, two, or more fifth sealing rings 2315. The three sets 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 set can be arranged side by side along the axial or radial direction of the cylinder 232 to achieve multiple sealing effects, depending on the specific situation.

[0097] like Figure 4 As shown, the drive rod 238 passes through the cylindrical portion 237 and is detachably connected to it. Specifically, the drive rod 238 includes a first rod and a second rod connected together. The first rod passes through the cylindrical portion 237, and the second rod extends outward and is detachably fixedly connected to the linkage rod 222. The end dimension of the first rod connecting to the second rod is larger than the end dimension of the second rod. This forms an annular end face between the first and second rods, which abuts against the right end of the cylindrical portion 237.

[0098] Therefore, when it is necessary to disassemble the transmission control assembly 230, the first end cover 233 and the mounting plate 250 are separated, the linkage rod 222 and the drive rod 238 are separated, and then the drive 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 making the drive rod 238 and the piston 235 a separable connection, the disassembly and assembly of the drive rod 238 in the transmission control assembly 230 can be facilitated, thereby facilitating the disassembly, assembly and maintenance of the transmission control assembly 230.

[0099] The transmission control assembly 230 of this application embodiment, through the cooperation of the hydraulic cylinder 231, piston 235, drive rod 238, and second spring 239, can reliably insert or withdraw the locking block 221 into the locking hole 201. Specifically, as shown... Figure 5As shown, when external hydraulic pressure is applied to piston 235, piston 235 will move to the left, driving drive rod 238 to move to the left, thereby driving linkage rod 222 to move to the left, causing locking block 221 to retract into locking sleeve. At this time, it is convenient to disassemble and install stress joint 202 of riser 20 and mounting base body 100.

[0100] like Figure 4 As shown, when the external hydraulic pressure is removed, under the elastic force of the second spring 239, the piston 235 can move to the right to reset, thereby making room for the drive rod 238 to move to the right. This allows the drive rod 238 to move to the right and reset under the action of the linkage rod 222 and the first spring 224. At the same time, the locking block 221 can extend outward and be inserted into the locking hole 201 to lock and fix the upright tube 20.

[0101] Therefore, the transmission control component 230 of this 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. Meanwhile, since it utilizes the second spring 239 to drive the piston 235 to reset and achieve the insertion and locking of the locking block 221 into the locking hole 201, while external hydraulic pressure is only used to drive the piston 235 to move and move the locking block 221 out of the locking hole 201, when the locking device 200 is in a long-term locking state, the transmission control component 230 of this application can avoid the need for long-term hydraulic pressure to ensure the locking function of the locking device 200, avoiding the risk of hydraulic system failure leading to the failure of the locking function of the locking device 200, thereby increasing the reliability and safety of the locking device 200.

[0102] Meanwhile, for use in harsh marine and seawater environments, the transmission control assembly 230 utilizes components such as the hydraulic cylinder 231 and drive rod 238, which are made of special corrosion-resistant materials and coated with a special corrosion-resistant coating. Furthermore, the transmission control assembly 230 employs cathodic protection, ensuring a design service life exceeding 30 years. This design also prevents marine organisms from adhering to the surface and internal grooves of the transmission control assembly 230, ensuring unimpeded movement of all moving parts within it. Multiple rows and quantities of sealing rings are arranged at the contact surfaces of the components within the hydraulic cylinder 231, significantly ensuring the tightness of the hydraulic system from low to high pressure ranges.

[0103] See Figure 4In the embodiments of this application, the mechanical drive assembly 240 is driven to the locking part 220 to manually drive the locking part 220 to move, thereby switching the locking part 220 between the positions of insertion and withdrawal from the locking hole 201. Specifically, the mechanical drive assembly 240 is driven to the drive block 223 to drive the drive block 223 to slide within the locking sleeve 210. When the drive block 223 moves, it can drive the locking block 221 to move via 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 drive 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 passes through the locking sleeve 210 and is connected to the drive block 223. The handle 241 is located on the side wall of the locking sleeve 210 and can move relative to the locking sleeve 210 under the action of external force, so as to drive the drive block 223 to slide within the locking sleeve 210 via the connecting shaft 245.

[0105] For example, in an embodiment of this application, the handle 241 can be eccentrically rotated under the action of an external force, so as to drive the drive block 223 to reciprocate within the locking sleeve 210 via the connecting shaft 245. This allows the locking block 221 to extend outward and insert into the locking hole 201 or retract and exit the locking hole 201.

[0106] Specifically, such as Figure 9 and Figure 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, which is eccentrically located on the ear seat 243. The connecting shaft 245 is rotatably located in the rotating hole 244.

[0107] A groove 211 extending axially along the side wall of the locking sleeve 210 is provided. The connecting shaft 245 passes through the groove 211 and is connected to the drive block 223. The handle 242 can drive the ear seat 243 to rotate eccentrically. The eccentric rotation of the ear seat 243 can drive the connecting shaft 245 to slide within the groove 211, so that the drive block 223 can slide within 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 of the handle 241 and the connecting shaft 245. Specifically, as shown... Figure 4 As shown, in normal operation, the locking block 221 of the locking device 200 extends outward. At this time, both the handle 241 and the drive block 223 are in their initial positions, and the first spring 224 is in its normal configuration. Combined with... Figure 6As shown, when the handle 241 is turned to the left, the handle 241 rotates eccentrically and drives the connecting shaft 245 to move to the left, thereby causing the drive block 223 connected to the connecting shaft 245 to move to the left. At this time, the drive block 223 can pull the locking block 221 to the left through the first spring 224, causing the locking block 221 to exit the locking hole 201 and retract into the locking sleeve.

[0109] With the locking block 221 retracted, when the handle 241 is turned to the right, the handle 241 rotates eccentrically and drives the connecting shaft 245 to move to the right, thereby causing the drive block 223 to move to the right. At this time, the drive block 223 can push the locking block 221 to the right via the first spring 224, extending it out of the locking sleeve 210 so that it can be inserted into the locking hole 201 of the riser 20, as detailed below. Figure 4 As shown.

[0110] Therefore, the mechanical drive assembly 240 of this application can reliably realize the insertion or withdrawal of the locking block 221 from the locking hole 201, and its operation is simple and convenient. Furthermore, the drive block 223 can be directly driven by manually operating the handle 241, causing the locking block 221 to perform telescopic movement, which can prevent the locking device 200 from malfunctioning due to external power failure in case of emergencies. Thus, the mechanical drive assembly 240 ensures that the locking device 200 does not malfunction, thereby increasing the reliability and safety of the locking device 200.

[0111] It should be noted that, in the embodiments of this application, the handle 241 can rotate eccentrically under the action of external force, thereby driving the drive block 223 to slide left and right within 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 its design is more ingenious. However, this application is not limited to this. In other embodiments, the handle 241 can also move to the right under the action of 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 move to the left under the action of 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, depending on the specific situation.

[0112] It should be noted that in this application, the transmission control component 230 and the mechanical drive component 240 do not operate completely independently. In some scenarios where manual operation is inconvenient, such as underwater operations, when it is necessary to install the riser 20 into the mounting base body 100, to avoid manual operation, the locking block 221 can be retracted by driving the transmission control component 230. At this time, the piston 235 of the transmission control component 230 can move to the left under external hydraulic pressure, which will drive the drive rod 238, the linkage rod 222, and the locking block 221 to move to the left together, thereby realizing the retraction of the locking block 221. At the same time, since the handle 241 and the drive block 223 of the mechanical drive component 240 are both in the initial position, the first spring 224 will be compressed and accumulate elastic force.

[0113] When the riser 20 is installed into the mounting base body 100, the external hydraulic pressure is removed. The piston 235 will move to the right and reset under the action of the second spring 239, thus creating space for the drive rod 238 to move to the right and reset. Simultaneously, the locking block 221 and the linkage rod 222 will move to the right and reset under the elastic force of the first spring 224. The locking block 221 can extend from the locking sleeve and insert into the locking hole 201 to lock and fix the riser 20. At the same time, the linkage rod 222 will drive the drive rod 238 to move to the right and reset. In other words, in this application, the extension of the locking block 221 driven by the transmission control assembly 230 requires the cooperation of the mechanical drive assembly 240.

[0114] Of course, in some scenarios where direct manual operation is convenient, the locking device 200 of this application can also directly drive the locking block 221 to extend and retract by rotating the handle 241, thereby locking or unlocking the vertical pipe 20.

[0115] The riser installation device for an offshore platform according to this application includes a mounting base body and multiple locking devices. The mounting base body is used for initial positioning and fixing of the riser, and the multiple locking devices are used to lock and fix the stress joints of the riser from multiple radial directions. Therefore, this riser installation device can effectively prevent the riser from flipping or even disengaging within the mounting base when the ship rolls under extreme marine conditions, thereby helping to ensure the safety and reliability of the riser system during use in the marine environment.

[0116] The riser installation device for offshore platforms in this application solves the problems of deflection and even the risk of detachment of the subsea riser when it is fixed on the mounting base under extreme capsizing or severe sea conditions of the FPSO. It also solves the problem of excessive stress on the pipelines connected to it.

[0117] The riser installation device for offshore platforms according to this application embodiment can achieve the locking function of the locking device on the riser not only through the transmission control component but also through the mechanical drive component. Therefore, under different operating conditions, the operator can choose different methods to lock or unlock the riser, and if one locking method fails, another locking method can be used to achieve locking. Thus, this riser installation device offers greater flexibility and stronger reliability.

[0118] The riser installation device for offshore platforms in this application embodiment is designed with both manual and hydraulic operation modes for the locking device, achieving the locking of the load-bearing sleeve of the underwater rigid riser. Furthermore, the mechanical and hydraulic locking methods are safer and more reliable. Even if one locking method fails during FPSO production, the presence of the other ensures that the subsea riser production system can still produce oil, thereby significantly increasing output and improving economic efficiency.

[0119] The above embodiments are merely illustrative examples of structures. The structures in each embodiment are not fixed combinations. In the absence of structural conflicts, the structures in multiple embodiments can be arbitrarily combined and used.

[0120] Although the invention has been described with reference to several typical embodiments, it should be understood that the terminology used is illustrative and exemplary, and not restrictive. Since the invention can be embodied in many 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. Therefore, all variations 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: Mounting base body, which is used to fix to an offshore platform, has a hollow mounting cavity, the inner wall of which is used to frictionally engage with the outer peripheral wall of the riser so that the riser is relatively fixedly mounted on the mounting base body; Multiple locking devices are spaced apart on the mounting base body along the circumference of the riser. Each locking device includes a locking sleeve, a locking part, a transmission control assembly, and a mechanical drive assembly. The locking sleeve is fixed on the mounting base body and is hollow inside and can communicate with the mounting cavity. The locking part is telescopically and slidably disposed inside the locking sleeve and is used to be inserted into the locking hole of the riser to lock the riser. The transmission control component is driven to the locking part, and is used to drive the locking part to move using an external power source, so that the locking part switches between the position of inserting into or retracting from the locking hole. The mechanical drive assembly is driven to the locking part, and is used to manually drive the locking part to move, thereby switching the locking part between the positions of being inserted into or withdrawn from the locking hole; The locking part 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 periphery of the linkage rod and can slide relative to the linkage rod. The first spring is sleeved on the outer periphery of the linkage rod and connected between the locking block and the driving block. The transmission control component is driven to the linkage rod to drive the linkage rod to slide inside 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 removed from the locking hole. The mechanical drive assembly is driven to the drive block to drive the drive block to slide within the locking sleeve. When the drive block moves, it can drive the locking block to move through the first spring, so that the locking block can be inserted into or removed from the locking hole.

2. The riser installation device for a marine platform according to claim 1, 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 within the hydraulic cylinder. The drive rod is connected to the piston and can extend out of the hydraulic cylinder to connect with the linkage rod. The second spring is disposed inside the hydraulic cylinder and abuts against the piston. The piston is used to move away from the locking sleeve under external hydraulic pressure, and drive the drive rod and the linkage rod to move so that the locking block exits the locking hole; The second spring is used to drive the piston toward the locking sleeve when the external hydraulic pressure is removed, so that the drive rod and the linkage rod can be reset, and the locking block can be inserted into the locking hole.

3. The riser installation device for a marine platform according to claim 2, characterized in that, The hydraulic cylinder body includes a cylinder barrel, a first end cap, and a second end cap. The first end cap and the second end cap are respectively disposed at both ends of the cylinder barrel and are respectively sealed to the cylinder barrel. The first end cap has a first through hole, and the second end cap has a second through hole; 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 sealed contact with the inner cavity wall of the cylinder. The two ends of the cylinder body are in sealed contact with the inner walls of the first through hole and the second through hole, respectively. The drive rod passes through the cylinder body and is detachably connected to the cylinder body.

4. The riser installation device for a marine platform according to claim 3, 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 disposed between the inner wall of the cylinder and the first end cap; the second sealing ring is disposed between the inner wall of the cylinder and the second end cap; the third sealing ring is disposed between the outer peripheral side wall of the plug body and the inner wall of the cylinder; the fourth sealing ring is disposed between the outer peripheral side wall of the cylinder body and the inner wall of the first through hole; and the fifth sealing ring is disposed between the outer peripheral side wall of the cylinder body and the inner wall of the second through hole.

5. The riser installation device for a marine platform according to claim 1, characterized in that, 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 passes through the locking sleeve and is connected to the drive block. The handle is located 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 inside the locking sleeve through the connecting shaft.

6. The riser installation device for an offshore platform according to claim 5, characterized in that, The handle can be eccentrically rotated under external force to drive the drive block to reciprocate within the locking sleeve via the connecting shaft.

7. The riser installation device for a marine platform according to claim 6, characterized in that, 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 located on the ear seat. The connecting shaft is rotatably located in the rotating hole. The locking sleeve has a sliding groove extending along the axial direction of the locking sleeve on its side wall, and the connecting shaft passes through the sliding groove and is connected to the driving block. The handle 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 can slide in the locking sleeve.

8. The riser installation device for a marine platform according to claim 1, characterized in that, The mounting base body includes a mounting part and a receiving part that are connected vertically upwards and downwards. Both the mounting part and the receiving part are hollow structures and are connected internally. The mounting cavity is formed inside the mounting portion, and a plurality of the locking devices are disposed on the side wall of the mounting portion; The interior of the receiving part forms a receiving cavity. The radial dimension of the lower end of the mounting cavity is greater than the radial dimension of the upper end of the receiving cavity. An annular step surface can be formed between the mounting cavity and the receiving cavity. The annular step surface is used to support the riser.

9. The riser installation device for a marine platform according to claim 1 or 8, characterized in that, The radial dimension of the mounting cavity gradually decreases vertically from top to bottom.

10. The riser installation device for an offshore platform according to claim 8, characterized in that, The radial dimension of the receiving cavity gradually increases vertically from top to bottom.

11. The riser installation device for a marine platform according to claim 1, characterized in that, A notch is provided on the side wall of the mounting base body, and the notch communicates with the mounting cavity, and the notch is used to allow the riser to enter the mounting cavity.

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