Hoisting and lowering method of steel catenary riser short section based on guide wire rope

Abstract

The present invention discloses a method for hoisting and lowering a steel catenary riser short section based on a guide wire rope. The method comprises the following steps: installing an A bracket and a winch for hoisting and lowering the riser short section on a platform; a diver installing a guide wire rope, wherein the first end of the guide wire rope is connected to the lifting lug and the first shackle of the A bracket on the water surface, and the terminal end is connected to the lifting lug and the manual hoist of the riser short section base under the water surface; platform construction workers connect the winch wire rope and the guide wire rope through a set of rigging according to the layout diagram of the winch wire rope lowering rigging; assemble the riser short section hoisting, transfer and lowering rigging according to the layout diagram of the riser short section hoisting rigging; and the platform crane connects the first annular sling on the riser short section hoisting rigging. The present invention uses a method for hoisting and lowering a riser short section based on a guide wire rope, so that the riser short section can be hoisted and lowered only by relying on a floating production platform without the support of an engineering vessel, thereby reducing construction costs and risks.

Description

Technical Field

[0001] The invention relates to the technical field of marine petroleum engineering technology, in particular to a method for hoisting and lowering a steel catenary riser short section based on a guide steel wire rope. Background Art

[0002] Steel catenary risers are widely used in deepwater oil and gas development due to their simple structure, low installation and construction costs, ability to meet large pipe diameter requirements, and resistance to high temperatures and high pressures. Riser nipples are typically used to connect underwater steel catenary risers to the platform's process pipelines. They are generally located at the bottom of floating production platforms and are installed by engineering vessels equipped with DP dynamic positioning. The offshore construction cost is relatively high.

[0003] However, some steel catenary riser short sections are designed to be installed inside the floating production platform. The crane of the engineering vessel cannot directly lift the riser short section to the installation position. In addition, there is a high risk of collision when the engineering vessel operates in close proximity to the platform. Therefore, this application proposes a method for lifting and lowering a steel catenary riser short section using a guide wire rope for construction based on a floating production platform to solve the above-mentioned problems. Summary of the Invention

[0004] The object of the present invention is to provide a method for hoisting and lowering a steel catenary riser short section based on a guide wire rope, so as to solve the problems raised in the above background technology.

[0005] To achieve the above object, the present invention provides the following technical solution: a method for hoisting and lowering a short section of a steel catenary riser based on a guide wire rope, comprising the following steps:

[0006] S1. Install the A bracket and winch for hoisting and lowering the riser short section on the platform;

[0007] S2. The diver installs the guide wire rope. The first end of the guide wire rope is connected to the shackle at the A bracket, and the other end is connected to the manual hoist at the base of the riser short section.

[0008] S3. The platform construction workers connect the winch wire rope and the guide wire rope through a set of rigging according to the winch wire rope lowering rigging layout diagram;

[0009] S4. Platform construction workers shall assemble the riser short section hoisting, transfer and lowering rigging according to the riser short section hoisting rigging layout diagram;

[0010] S5. The platform crane connects the first ring sling on the riser short section lifting rigging to lift the riser short section. After the riser short section is moved to the vicinity of the A bracket, the platform construction personnel connect the second ring sling of the riser short section lifting rigging to the ROV hook at the end of the winch wire rope rigging.

[0011] S6: The winch pulls the belt force to transfer the weight of the riser short section to the ring sling and winch, untie the connection between the crane and the first ring sling on the riser short section lifting rigging, and release and recover the platform crane;

[0012] S7. The winch is slowly lowered, and the riser section slowly slides down from the water surface along the guide wire rope to the vicinity of the underwater installation position;

[0013] S7. Install a float bag on the riser sub lifting rigging. Divers inflate the float bag to gradually transfer the weight of the riser sub from the winch to the float bag.

[0014] S8. With the assistance of the float bag, the diver performs underwater installation of the riser short section according to the flange assembly connection procedure.

[0015] Furthermore, the guide wire rope in step S2 is a force-bearing rope formed by twisting multiple layers of carbon steel wires into strands, which are then twisted into a spiral shape with a certain number of strands around the rope core.

[0016] Furthermore, the guide wire rope in step S2 is tied and fastened by a wire rope clamp, and the diver operates a manual hoist to keep the guide wire rope in a taut state.

[0017] Furthermore, in step S3, the winch wire rope is slid up and down along the direction of the guide wire rope by the shackle, connected to the winch wire rope by the annular sling, and connected to the second annular sling of the riser short-circuit lifting rigging by the ROV hook.

[0018] Furthermore, in step S4, the riser short section lifting rigging is a set of two-legged lifting rigging, which is respectively connected to the upper and lower pipe sections of the riser short section, so that the riser short section remains vertical during the lifting and lowering process.

[0019] Furthermore, in step S4, two annular slings for lifting and transferring are configured on the upper part of the riser short section lifting rigging, wherein the annular slings are connected to the platform crane for lifting the riser short section by the crane, and the annular slings are connected to the winch rigging for transferring the riser short section between the crane and the winch, as well as lowering it after transfer.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] The method for hoisting and lowering the first annular sling short section of the steel catenary riser based on the guide wire rope does not require the support of an engineering vessel and only relies on a floating production platform to hoist and lower the first annular sling short section of the steel catenary riser, thereby reducing construction costs and risks. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the lowering operation of the steel catenary riser short section along the guide wire rope of the present invention;

[0023] Figure 2 for Figure 1 A magnified view of the structure of part A in the middle;

[0024] Figure 3 for Figure 1 A magnified view of the structure of part B in the middle;

[0025] Figure 4 for Figure 1 A magnified view of the structure of the middle C part;

[0026] Figure 5 This is a schematic diagram of the platform crane of the present invention performing a hoisting operation on a short section of a steel catenary riser;

[0027] Figure 6 This is a schematic diagram of the diver performing the steel catenary riser short section placement operation according to the present invention;

[0028] Figure 7 This is a schematic diagram of the steel catenary riser short section lifting rigging of the present invention.

[0029] In the figure: 1. Shackle; 2. Wire rope clamp; 3. Guide wire rope; 4. Shackle; 5. Ring sling; 6. Shackle; 7. Lifting ring; 8. ROV hook; 9. Ring sling; 10. Manual hoist; 11. Shackle; 12. A-bracket; 13. Steel catenary riser short section; 14. Platform crane; 15. Float bag; 16. Diver; 17. Ring sling. DETAILED DESCRIPTION

[0030] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0031] It should be noted that, in the description of the present invention, the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0032] Furthermore, it should be understood that for the sake of ease of description, the sizes of the various components shown in the drawings are not drawn according to actual proportions. For example, the thickness or width of certain layers may be exaggerated relative to other layers.

[0033] It should be noted that like numbers and letters represent similar items in the following figures, so once an item is defined or described in one figure, it will not need to be further discussed and described in detail in the description of the subsequent figures.

[0034] like Figure 1-Figure 7 As shown, the present invention provides a technical solution: a method for hoisting and lowering a short section of a steel catenary riser based on a guide wire rope, comprising the following steps:

[0035] S1. Install the standpipe short section on the platform for hoisting and lowering using bracket A and winch 12;

[0036] S2. The diver installs the guide wire rope 3. The first end of the guide wire rope is connected to the shackle 1 at the A bracket, and the tail end is connected to the manual hoist 10 at the base of the riser short section.

[0037] S3. The platform construction workers connect the winch wire rope and the guide wire rope 3 through a set of rigging according to the winch wire rope lowering rigging layout diagram;

[0038] S4. Platform construction workers shall assemble the riser short section hoisting, transfer and lowering rigging according to the riser short section hoisting rigging layout diagram;

[0039] S5. The platform crane 14 connects the first ring sling 17 on the riser short section lifting rigging and lifts the riser short section 13. After the riser short section is moved to the vicinity of the A bracket, the platform construction personnel connect the second ring sling 9 of the riser short section lifting rigging to the ROV hook 8 at the end of the winch wire rope rigging;

[0040] S6, the winch pulls the belt force to transfer the weight of the riser short section to the endless sling 9 and the winch, untie the connection between the crane and the first endless sling 17 on the riser short section lifting rigging, and release and recover the platform crane;

[0041] S7. The winch is slowly lowered, and the riser sub slowly slides down from the water surface along the guide wire rope 3 to the vicinity of the underwater installation position;

[0042] S7. A float bag 15 is installed on the riser sub lifting rigging. Diver 16 inflates the float bag to gradually transfer the weight of the riser sub from the winch to the float bag.

[0043] S8. With the assistance of the float bag, the diver performs underwater installation of the riser short section according to the flange assembly connection procedure.

[0044] It should be noted that the present application uses a method for hoisting and lowering a steel catenary riser short section based on a guide wire rope 3, so that the riser short section can be hoisted and lowered without the support of an engineering vessel and can be carried out only by relying on a floating production platform, thereby reducing construction costs and risks.

[0045] In addition, it should be noted that in the present application, the guide wire rope 3 in step S2 is a force-bearing rope made of multiple layers of carbon steel wire twisted into strands, which is then twisted into a spiral shape with a certain number of strands around the rope core. By using this force-bearing rope, the safety of the diver during actual operation can be greatly enhanced.

[0046] Next, we will briefly describe the steps of the method for hoisting and lowering the steel catenary riser short section based on the guide wire rope:

[0047] In the present application, the guide wire rope 3 in step S2 is tied and fastened by the wire rope clamp 2, and the diver 16 operates the manual hoist 10 to ensure that the guide wire rope is in a taut state.

[0048] In addition, in the present application, in step S3, the winch wire rope is slid up and down along the direction of the guide wire rope 3 by the shackle 6, the connection with the winch wire rope is achieved by the annular sling 5, and the connection with the annular sling 9 of the riser short-circuit lifting rigging is achieved by the ROV hook 8.

[0049] In addition, in the present application, the riser short section lifting rigging in step S4 is a set of two-legged lifting rigging, which is respectively connected to the upper and lower pipe sections of the riser short section 13, so that the riser short section remains vertical during the lifting and lowering process.

[0050] In addition, in the present application, two annular slings for lifting and transferring are configured on the upper part of the riser short section lifting rigging in step S4, wherein the annular sling 17 is connected to the platform crane for lifting the riser short section by the crane, and the annular sling 9 is connected to the winch rigging for transferring the riser short section between the crane and the winch, as well as lowering it after the transfer.

[0051] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A method for hoisting and lowering a short section of a steel catenary riser based on a guide wire rope, characterized in that: The following steps are involved: S1. Install the standpipe short section on the platform for hoisting and lowering the bracket A and winch (12); S2. The diver installs the guide wire rope (3). The first end of the guide wire rope is connected to the shackle (1) at the A bracket, and the terminal end is connected to the manual hoist (10) at the base of the riser short section; S3. The platform construction workers connect the winch wire rope and the guide wire rope (3) through a set of rigging according to the layout of the winch wire rope lowering rigging; S4. Platform construction workers shall assemble the riser short section hoisting, transfer and lowering rigging according to the riser short section hoisting rigging layout diagram; S5, the platform crane (14) connects the first annular sling (17) on the riser short section lifting rigging, lifts the riser short section (13), and after the riser short section is transferred to the vicinity of the A bracket, the platform construction personnel connect the second annular sling (9) of the riser short section lifting rigging to the ROV hook (8) at the end of the winch wire rope rigging; S6, the winch pulls the belt force to transfer the weight of the riser short section to the second ring sling (9) and the winch, untie the connection between the platform crane and the first ring sling (17) on the riser short section lifting rigging, and release and recover the platform crane; S7, the winch is slowly lowered, and the riser short section slowly slides down from the water surface along the guide wire rope (3) to the vicinity of the underwater installation position; S7. A float bag (15) is installed on the riser short section lifting rigging, and a diver (16) inflates the float bag to gradually transfer the weight of the riser short section from the winch to the float bag; S8. With the assistance of the float bag, the diver performs underwater installation of the riser short section according to the flange assembly connection procedure.

2. The method for hoisting and lowering a steel catenary riser short section based on a guide wire rope according to claim 1, characterized in that: The guide wire rope (3) in step S2 is a force-bearing rope made by twisting multiple layers of carbon steel wires into strands, which are then twisted into a spiral shape with a certain number of strands around the rope core.

3. The method for hoisting and lowering a steel catenary riser short section based on a guide wire rope according to claim 1, characterized in that: The guide wire rope (3) in step S2 is tied and fastened by the wire rope clamp (2), and the diver operates the manual hoist (10) to ensure that the guide wire rope is in a taut state.

4. The method for hoisting and lowering a steel catenary riser short section based on a guide wire rope according to claim 1, characterized in that: In the step S3, the winch wire rope is slid up and down along the direction of the guide wire rope (3) by the shackle (6), connected to the winch wire rope by the annular sling (5), and connected to the second annular sling (9) of the riser short-circuit lifting rigging by the ROV hook (8).

5. The method for hoisting and lowering a steel catenary riser short section based on a guide wire rope according to claim 1, characterized in that: In the step S4, the riser short section lifting rigging is a set of two-legged lifting rigging, which is respectively connected to the upper and lower pipe sections of the riser short section (13), so that the riser short section can be kept in a vertical state during the lifting and lowering process.

6. The method for hoisting and lowering a steel catenary riser short section based on a guide wire rope according to claim 1, characterized in that: In the step S4, two annular slings for lifting and transferring are arranged on the upper part of the riser short section lifting rigging, wherein the annular sling (17) is connected to the platform crane for lifting the riser short section by the crane, and the annular sling (9) is connected to the winch rigging for transferring the riser short section between the crane and the winch, and lowering it after the transfer.

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