A method of installing risers with twin cranes onboard a vessel supported by saturation diving

A technology of double cranes and standpipes, which is applied in drilling pipes, casings, and earthwork drilling and mining, can solve the problems of saturated diving support ships, unsuitable control of construction progress, and shortage of ship resources, etc., to improve work efficiency and economy. Benefits, reduced possibility of saturation diving support vessel standby, effect of reduced construction risk
CN103883273BActive Publication Date: 2016-05-11CHINA NAT OFFSHORE OIL CORP +2
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
CHINA NAT OFFSHORE OIL CORP
Publication Date
2016-05-11

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Abstract

The invention discloses a method for utilizing two cranes on a saturation diving support vessel to mount a vertical pipe. The method is characterized by including the following steps: 1, transferring operating personnel to a barge; 2, mounting lower-section vertical pipe rigging; 3, experimentally hoisting the lower section of the vertical pipe by the cranes; 4, transferring the operating personnel back; 5, lifting the lower section of the vertical pipe by the cranes, and moving the barge out; 6, fixing the lower section of the vertical pipe on a rail of the barge by the cranes; 7, lowering the lower section of the vertical pipe into water, and maintaining the lower section of the vertical pipe vertical in the water; 8, loosening a main crane; 9, enabling an underwater robot to dive; 10, embedding the lower-section of the vertical pipe into a vertical pipe clamp for fixing; 11, repeating the above steps until the whole vertical pipe is mounted completely. By the method, only the saturation diving support vessel and a self-propelled barge are needed to perform mounting of a deepwater vertical pipe, so that requirements on vessel resources are greatly lowered, and working efficiency and economic benefit are improved.
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Description

technical field

[0001] The invention relates to a method for installing a standpipe, in particular to a method for installing a standpipe with two cranes on a ship supported by saturated diving and with the cooperation of a self-propelled barge to successfully complete the lifting, righting, transfer and installation of the standpipe Methods. It belongs to the field of offshore oil engineering. Background technique

[0002] In recent years, in order to save the development cost of offshore oil and gas fields, there have been more and more projects to develop surrounding oil fields relying on established oil field facilities. For example, in the South China Sea, most of these projects rely on large-scale integrated platforms with oil and gas processing capabilities, and build some small derrick platforms or underwater wellhead facilities nearby. To transport the oil and gas resources produced by the small derrick platform or the underwater wellhead to the comprehensive proc...

Claims

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