A method for installing a deepwater oversized anti-sinking plate

Abstract

The present invention discloses a method for installing an oversized deepwater anti-sinking plate, comprising the following steps: loading and securing the anti-sinking plate on the deck of a transport barge, which is then sailed to an oil and gas field site; using a crane on an engineering vessel to lift the anti-sinking plate and tilt it from a horizontal position to an inclined position; the engineering vessel then lifts the anti-sinking plate into the water at an inclined position; using an ROV to adjust the anti-sinking plate's direction underwater and connect it to the engineering vessel via auxiliary righting rigging; slowly lowering the engineering vessel's crane to gradually transfer the weight of the anti-sinking plate to the auxiliary righting rigging, while the ROV partially releases the lifting rigging; slowly recovering the engineering vessel's crane to convert the anti-sinking plate from an inclined position to a horizontal position; releasing the underwater righting rigging; adjusting the anti-sinking plate's bow direction underwater to assist the engineering vessel's crane in installing the anti-sinking plate to the designed position; and finally releasing the lifting rigging to complete the anti-sinking plate installation. The present invention reduces the impact force of the anti-sinking plate entering the water, lowering the risk of offshore installation and reducing construction costs.

Description

Technical Field

[0001] The present invention relates to the technical field of marine petroleum engineering, and in particular to a method for installing a deepwater super-large anti-sinking plate. Background Art

[0002] An anti-sinking plate is a gravity-type underwater structure that supports underwater oil and gas production facilities such as pipeline terminals, base plates, and manifolds. It has skirts designed around its bottom. Under the action of gravity, the skirts are inserted into the seabed to prevent the upper main structure of the underwater facility from excessive lateral displacement or settlement after installation. It is an important component of underwater production facilities. As oil and gas field development moves towards deep water, the size and weight of underwater production facilities and anti-sinking plates are also increasing. Due to the limited capacity of engineering vessel cranes, the upper main structure of the underwater facility and the anti-sinking plate are usually designed as split parts, installed separately, and assembled in place underwater. Due to the large structural area of ​​the anti-sinking plate's bottom, if the conventional vertical lifting and lowering method is used, the lifting rigging will be loosened due to the huge impact of the waves when it is lifted into the water, creating a safety risk. Therefore, there is an urgent need for an installation method for deep-water extra-large anti-sinking plates. Summary of the Invention

[0003] The purpose of the present invention is to provide a method for installing an oversized anti-sinking plate in deep water. By tilting the anti-sinking plate into the water, the impact force of the anti-sinking plate entering the water is reduced, and the capacity requirements of the engineering vessel crane are lowered, thereby improving the sea conditions allowed for offshore installation, reducing offshore installation risks and reducing construction costs.

[0004] In order to achieve the purpose of the present invention, the present invention provides a method for installing a deep-water oversized anti-sinking plate, comprising the following steps:

[0005] S1. The anti-sinking plate is loaded and fixed on the deck of the transport barge, the rotating frame and the lifting rigging are pre-installed on the anti-sinking plate, and the transport barge sails to the oil and gas field site;

[0006] S2. The transport barge approaches the engineering vessel, and the engineering vessel's crane lifts the anti-sinking plate, turning it from a horizontal state to an inclined state;

[0007] S3. The engineering vessel tilts and hoists the anti-sinking plate into the water and lowers it to a depth of about 50 meters underwater;

[0008] S4. Use the ROV to adjust the direction of the anti-sinking plate underwater so that the high point of the plate faces the engineering vessel, and connect the anti-sinking plate to the engineering vessel using auxiliary righting rigging;

[0009] S5. The engineering vessel crane slowly lowers, gradually transferring the weight of the anti-sinking plate to the auxiliary righting rigging, and the ROV releases some of the lifting rigging connections;

[0010] S6. The crane of the engineering vessel slowly recovers and gradually transfers the weight of the anti-sinking plate to the lifting rigging. The anti-sinking plate is transformed from an inclined state to a horizontal state, completing the underwater righting of the anti-sinking plate.

[0011] S7: The ROV releases the underwater righting rigging, and the engineering vessel crane lowers the anti-sinking plate horizontally to a height of about 10 meters from the seabed.

[0012] S8. The ROV adjusted the bow direction of the anti-sinking plate underwater and assisted the engineering vessel crane to install the anti-sinking plate to the designed position. The ROV removed the lifting rigging and completed the installation of the anti-sinking plate.

[0013] As a preferred technical solution of the present invention, the lifting rigging includes an inclined lifting short rigging, an underwater righting rigging and two horizontal lifting riggings. The underwater righting rigging is installed close to the side of the inclined lifting short rigging, and the inclined lifting short rigging and the two horizontal lifting riggings are connected to the engineering ship crane.

[0014] As a preferred technical solution of the present invention, in step S2, the engineering ship crane lifts the anti-sinking plate, and a horizontal lifting rigging and an inclined lifting short rigging are subjected to force, so that the anti-sinking plate is flipped from a horizontal state to an inclined state.

[0015] As a preferred technical solution of the present invention, in step S4, the direction of the anti-sinking plate is adjusted underwater by ROV so that one side of the underwater righting rigging faces the engineering ship, and the underwater righting rigging is connected to the engineering ship through the auxiliary righting rigging.

[0016] As a preferred technical solution of the present invention, in step S5, the engineering ship crane is slowly lowered, a horizontal lifting rigging and an underwater righting rigging are subjected to force, and the weight of the anti-sinking plate is gradually transferred to the auxiliary righting rigging, and the ROV releases the connection of the inclined lifting short rigging.

[0017] As a preferred technical solution of the present invention, in step S6, the engineering ship crane is slowly recovered, and the two horizontal lifting riggings are subjected to force, gradually transferring the weight of the anti-sinking plate to the engineering ship crane, and the anti-sinking plate is converted from an inclined state to a horizontal state, completing the righting of the anti-sinking plate underwater.

[0018] As a preferred technical solution of the present invention, in step S8, after the anti-sinking plate is installed to the designed position, the ROV releases the connection between the two horizontal lifting riggings to complete the installation of the anti-sinking plate.

[0019] Compared with the prior art, the present invention provides a method for installing an oversized anti-sinking plate in deep water, which has the following beneficial effects:

[0020] The engineering vessel's crane lifts the anti-sinking plate. A horizontal lifting rigging and a short inclined lifting rigging are applied, causing the plate to tilt from a horizontal position. An ROV uses underwater control to adjust the plate's orientation, with one side of the underwater righting rigging facing the engineering vessel. The underwater righting rigging is then connected to the engineering vessel via an auxiliary righting rigging. The engineering vessel's crane slowly lowers the plate. A horizontal lifting rigging and an underwater righting rigging are applied, gradually transferring the plate's weight to the auxiliary righting rigging. The ROV then disconnects the short inclined lifting rigging. The engineering vessel's crane slowly retracts the plate. The two horizontal lifting rigging are applied, gradually transferring the plate's weight to the crane, transforming the plate from a tilted position to a horizontal position, completing the underwater righting of the plate. The ROV disconnects the underwater righting rigging, and the engineering vessel's crane lowers the plate horizontally to a height of approximately 10 meters above the seabed. Once the plate is in its designed position, the ROV disconnects the two horizontal lifting rigging, completing the installation of the plate. By tilting the anti-sinking plate into the water, the impact force of the anti-sinking plate entering the water is reduced, and the capacity requirements of the engineering vessel crane are lowered, thereby improving the allowable sea conditions for offshore installation, reducing offshore installation risks and reducing construction costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the anti-sinking plate of the present invention being turned over and lifted on a transport barge;

[0022] Figure 2 This is a schematic diagram of the anti-sinking plate of the present invention being tilted and hoisted and lowered into water;

[0023] Figure 3 Schematic diagram of the ROV of the present invention performing an anti-sinking plate bow adjustment operation underwater;

[0024] Figure 4 This is a schematic diagram of the ROV connected to the underwater righting rigging operation of the present invention;

[0025] Figure 5 Schematic diagram of the anti-sinking plate of the present invention during underwater righting operation;

[0026] Figure 6 It is a schematic diagram of the lowering and installation operation of the anti-sinking plate of the present invention. DETAILED DESCRIPTION

[0027] 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.

[0028] See also Figures 1-6The embodiment of the present invention provides a method for installing a deepwater oversized anti-sinking plate, comprising the following steps:

[0029] S1. The anti-sinking plate is loaded and fixed on the deck of the transport barge, the rotating frame and the lifting rigging are pre-installed on the anti-sinking plate, and the transport barge sails to the oil and gas field site;

[0030] S2. The transport barge approaches the engineering vessel, and the engineering vessel's crane lifts the anti-sinking plate, turning it from a horizontal state to an inclined state;

[0031] S3. The engineering vessel tilts and hoists the anti-sinking plate into the water and lowers it to a depth of about 50 meters underwater;

[0032] S4. Use the ROV to adjust the direction of the anti-sinking plate underwater so that the high point of the plate faces the engineering vessel, and connect the anti-sinking plate to the engineering vessel using auxiliary righting rigging;

[0033] S5. The engineering vessel crane slowly lowers, gradually transferring the weight of the anti-sinking plate to the auxiliary righting rigging, and the ROV releases some of the lifting rigging connections;

[0034] S6. The crane of the engineering vessel slowly recovers and gradually transfers the weight of the anti-sinking plate to the lifting rigging. The anti-sinking plate is transformed from an inclined state to a horizontal state, completing the underwater righting of the anti-sinking plate.

[0035] S7: The ROV releases the underwater righting rigging, and the engineering vessel crane lowers the anti-sinking plate horizontally to a height of about 10 meters from the seabed.

[0036] S8. The ROV adjusted the bow direction of the anti-sinking plate underwater and assisted the engineering vessel crane to install the anti-sinking plate to the designed position. The ROV removed the lifting rigging and completed the installation of the anti-sinking plate.

[0037] In one embodiment of the present invention, the lifting rigging includes an inclined lifting short rigging, an underwater righting rigging and two horizontal lifting riggings, wherein the underwater righting rigging is installed close to the side of the inclined lifting short rigging, and the inclined lifting short rigging and the two horizontal lifting riggings are connected to the engineering ship crane.

[0038] In one embodiment of the present invention, in step S2, the engineering ship crane lifts the anti-sinking plate, and a horizontal lifting rigging and an inclined lifting short rigging are subjected to force, so that the anti-sinking plate is flipped from a horizontal state to an inclined state.

[0039] In one embodiment of the present invention, in step S4, the direction of the anti-sinking plate is adjusted underwater by the ROV so that one side of the underwater righting rigging faces the engineering ship, and the underwater righting rigging is connected to the engineering ship through the auxiliary righting rigging.

[0040] In one embodiment of the present invention, in step S5, the engineering vessel crane is slowly lowered, a horizontal lifting rigging and an underwater righting rigging are stressed, the weight of the anti-sinking plate is gradually transferred to the auxiliary righting rigging, and the ROV releases the connection of the inclined lifting short rigging.

[0041] In one embodiment of the present invention, in step S6, the engineering ship crane is slowly recovered, and the two horizontal lifting riggings are subjected to force, gradually transferring the weight of the anti-sinking plate to the engineering ship crane, and the anti-sinking plate is converted from an inclined state to a horizontal state, completing the righting of the anti-sinking plate underwater.

[0042] In one embodiment of the present invention, in step S8, after the anti-sinking plate is installed at the designed position, the ROV releases the connection between the two horizontal lifting riggings to complete the installation of the anti-sinking plate.

[0043] The above are only preferred specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with this technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solutions and inventive concepts of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A method for installing a deepwater oversized anti-sinking plate, characterized in that: The following steps are involved: S1. The anti-sinking plate is loaded and fixed on the deck of the transport barge. The rotating frame and the lifting rigging are pre-installed on the anti-sinking plate. The lifting rigging includes a short inclined lifting rigging, an underwater righting rigging, and two horizontal lifting riggings. The underwater righting rigging is installed close to the side of the short inclined lifting rigging. The short inclined lifting rigging and the two horizontal lifting riggings are connected to the crane of the engineering vessel. The transport barge sails to the oil and gas field site. S2. The transport barge approaches the engineering vessel, and the engineering vessel's crane lifts the anti-sinking plate, turning it from a horizontal state to an inclined state; S3. The engineering vessel tilts and hoists the anti-sinking plate into the water and lowers it to a depth of about 50 meters underwater; S4. Use the ROV to adjust the direction of the anti-sinking plate underwater so that the high point of the anti-sinking plate faces the engineering vessel, and connect the anti-sinking plate to the engineering vessel using auxiliary righting rigging; S5. The engineering vessel crane slowly lowers, gradually transferring the weight of the anti-sinking plate to the auxiliary righting rigging, and the ROV releases some of the lifting rigging connections; S6. The crane of the engineering vessel slowly recovers and gradually transfers the weight of the anti-sinking plate to the lifting rigging. The anti-sinking plate is transformed from an inclined state to a horizontal state, completing the underwater righting of the anti-sinking plate. S7: The ROV releases the underwater righting rigging, and the engineering vessel crane lowers the anti-sinking plate horizontally to a height of about 10 meters from the seabed. S8. The ROV adjusted the bow direction of the anti-sinking plate underwater and assisted the engineering vessel crane to install the anti-sinking plate to the designed position. The ROV removed the lifting rigging and completed the installation of the anti-sinking plate.

2. The method for installing a deepwater oversized anti-sinking plate according to claim 1, characterized in that: In step S2, the anti-sinking plate is lifted by a crane of the engineering vessel, and a horizontal lifting rigging and an inclined lifting short rigging are subjected to force, so that the anti-sinking plate is flipped from a horizontal state to an inclined state.

3. The method for installing a deepwater oversized anti-sinking plate according to claim 1, characterized in that: In step S4, the direction of the anti-sinking plate is adjusted underwater by the ROV so that one side of the underwater righting rigging faces the engineering ship, and the underwater righting rigging is connected to the engineering ship through the auxiliary righting rigging.

4. The method for installing a deepwater oversized anti-sinking plate according to claim 1, characterized in that: In step S5, the crane of the engineering vessel is slowly lowered, a horizontal lifting rigging and an underwater righting rigging are stressed, and the weight of the anti-sinking plate is gradually transferred to the auxiliary righting rigging, and the ROV releases the connection of the short inclined lifting rigging.

5. The method for installing a deepwater oversized anti-sinking plate according to claim 1, characterized in that: In step S6, the engineering ship crane is slowly retracted, and the two horizontal lifting riggings are stressed, gradually transferring the weight of the anti-sinking plate to the engineering ship crane, and the anti-sinking plate is converted from an inclined state to a horizontal state, completing the underwater righting of the anti-sinking plate.

6. The method for installing a deepwater oversized anti-sinking plate according to claim 1, characterized in that: In step S8, after the anti-sinking plate is installed to the designed position, the ROV releases the connection between the two horizontal lifting riggings to complete the installation of the anti-sinking plate.

Images