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

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.

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...

AI Technical Summary

Problems solved by technology

[0004] At present, with the rapid development of my country's offshore oil industry, the task of manufacturing and installing large-scale oil platform structures is getting heavier and heavier, and the offshore transportation and installation of these large-scale structures must be completed by large-scale lifting construction ships. However, due to my country's existing large-scale crane construction ship resources are very tight. At the same time, during offshore construction, due to the failure of large-scale crane construction ships or dynamic positioning ships, the possibility of saturation diving support ships being on standby is extremely high, and the construction progress is not suitable. Control, thus, increases costs and decreases profits

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