FIELD: oil and gas industry.
SUBSTANCE: group of inventions refers to offshore hydrocarbon production from a well to a platform. Method for assembling a flexible line between a marine platform and an underwater structure, where the platform has a descent platform for lowering a flexible line, the drainage platform facing away from the platform to the mounting side. Method comprises the following: moving the platform in the direction from the installation side and placing the pipe-laying vessel on the mounting side; lowering upper or underwater end of the flexible line from the pipe-laying vessel; moving pipe-laying vessel from the platform and moving the platform towards the pipe-laying vessel; and mounting lowered end to the underwater structure or to the landing site. Method for dismantling the flexible line comprises the following: detaching the upper end of the flexible line from the landing site; lowering the upper end from the landing site to the seabed with a winch mounted on the platform and disconnect the winch from the upper end; moving the platform in the direction from the installation side and placing the pipe-laying vessel on the mounting side; lowering lifting cable from the pipe-laying vessel and attach the end of the lifting cable to the upper end of the flexible line or to the underwater end of the flexible line; lifting the attached upper or underwater end to the pipe-laying vessel from the seabed by means of a lifting cable; lifting flexible line to the pipe-laying vessel, and then the platform is able to move back to the working position.
EFFECT: continuous production of hydrocarbons, due to the continuous operation of the pipe-laying vessel.
19 cl, 22 dwg
