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Installation method of deep-sea heavy-duty facilities with gradual free release of buoyancy blocks

An installation method and buoyancy block technology are applied in transportation and packaging, underwater operation equipment, ships, etc., which can solve the problems of insufficient versatility and difficulty in greatly increasing the installation weight, and achieve the effect of reducing the requirement of compensation capacity.

Active Publication Date: 2017-10-10
SINOPEC SHENGLI PETROLEUM ENG CO LTD DRILLING TECH RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The installation equipment and method (2012100274318) of deep-sea submarine storage tanks disclosed in China are suitable for installing deep-sea tank-shaped structures, mainly using light liquid as an auxiliary, and the versatility is insufficient; an auxiliary installation device and installation method for underwater equipment with adjustable buoyancy (2014100482517) uses Without deep-sea buoyancy materials, it is difficult to greatly increase the installation weight

Method used

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  • Installation method of deep-sea heavy-duty facilities with gradual free release of buoyancy blocks
  • Installation method of deep-sea heavy-duty facilities with gradual free release of buoyancy blocks
  • Installation method of deep-sea heavy-duty facilities with gradual free release of buoyancy blocks

Examples

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Effect test

Embodiment 1

[0048] Example 1: Installation of joint module of subsea manifold and oil-gas separation

[0049] The water depth of the target area is 3000m. The self-weight of the module and accessories is 1321t, and the underwater self-weight is 1081t. Each deep sea buoyancy block used is 300m 3 , with a dead weight of 201.5t and a remaining buoyancy of 106t, according to the calculation, 10 deep-sea buoyancy blocks are selected. The remaining weight of full immersion is 21t. As the water enters deeper, the remaining buoyancy provided by the deep-sea buoyancy block will decrease, and the remaining weight will increase to 53t. It is hoisted with a single cable with an allowable pulling force of 980KN. Connect all the equipment and components on a large barge with a total weight of 3436t. Use an auxiliary crane with a lifting capacity of 4500t to hoist the complete set of equipment into the water. After fully entering the water, retract the winch and slowly tighten the sling to accept 21t ...

Embodiment 2

[0050] Example 2: 100000m 3 Underwater tank installation

[0051] The water depth of the target sea area is 1500m. The main body of the storage tank is made of steel, with double walls, double roofs and no bottom. The maximum capacity of the storage tank is 100000m 3 , including the fixed weight of 18577t, the underwater weight of 14596t, and the underwater weight of 15311t after adding other auxiliary installation components; each deep-sea buoyancy block used is 300m 3 , with a dead weight of 201.5t and a remaining buoyancy of 106t, according to calculations, 144 deep-sea buoyancy blocks are selected. The remaining weight of full immersion is 47t. With the deepening of the water, the remaining buoyancy provided by the deep-sea buoyancy block under pressure will decrease, and the remaining weight will increase to 194t. Therefore, it is slightly different from the previous scheme: one is to use a double set of hoisting system, which consists of two Two systems with a single...

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Abstract

The present invention discloses a deep sea heavy equipment installation method capable of gradually freely releasing buoyancy blocks, belongs to the technical field of marine engineering, and solves the problems of deep sea underwater heavy equipment installation. The method utilizes a plurality of buoyancy blocks for carrying to reduce underwater weight to realize single-cable lifting of underwater facilities with weight far beyond rated tensile, and meanwhile significantly reduces requirements on main hoisting rack lifting capacity and heave compensator compensation capability, construction buoyancy blocks can be freely gradually recovered, requirements on release operating force of a too-large single buoyancy block can be avoided, and standardized manufacturing and reserving of buoyancy blocks and ramp umbrellas and the like can be achieved. The method disruptively breaks through the current deep sea block installation weight limit, and has great significance to construction of underwater large-scale facilities.

Description

technical field [0001] The invention belongs to the technical field of marine engineering, and relates to the deep-sea installation technology of heavy-duty submarine facilities. Background technique [0002] Limited by the lifting capacity and rope capacity of the floating crane, the maximum weight of a single unit installed on the deep seabed does not exceed several hundred tons at present, and there is no precedent for underwater installation of a structure with a self-weight of more than 1,000 tons in a sea area above 300m. Although the maximum lifting capacity of large-scale offshore floating cranes reaches tens of thousands of tons, the effective lifting range is usually similar to the height of the jib. For deep-sea installations, some operators temporarily modify the main hanger to increase the rope capacity of the winch and reduce the load. Rope pulleys, which also greatly reduce the maximum weight of the single unit that can be installed. [0003] At present, the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B63C11/52
Inventor 张士华徐松森初新杰田凯傅忠尧商立社任红伟王宏安高慧刘海超
Owner SINOPEC SHENGLI PETROLEUM ENG CO LTD DRILLING TECH RES INST