Lifting and righting method of tension tendon of tension leg platform

Abstract

The invention discloses a hoisting and righting method for a tension tendon of a tension leg platform. The hoisting and righting method for the tension tendon of the tension leg platform comprises the following steps that 1, an upper section and main body section of the tension tendon is arranged on a deck of a floating crane ship; 2, a floating crane rigging hoisting device is connected and an auxiliary hoisting device is connected; 3, amplitude varying operation is carried out, so that the upper section and main body section of the tension tendon is slowly lifted and is kept horizontal after leaving the deck of the main ship by a certain distance, at the moment, the amplitude variation of a crawler crane and the height of a lifting hook of the crawler crane are not changed, then the amplitude varies continuously, a floating crane rotates, and a floating crane lifting hook is lifted, so that the upper section and main body section is righted stably and safely in the air; 4, the triangular plate auxiliary hoisting device is loosened, a lifting bucket falls off slowly and freely, a hoisting belt freely slides out of the bottom of the upper section and main body section, and hoisting and righting are completed; and 7, the hoisting and righting steps are repeated to complete the righting of a bottom section. According to the method, not only the tension tendon can be hoisted and turned, the construction operation risk is greatly reduced, but also the construction efficiency is greatly improved.

Description

technical field [0001] The invention relates to a tension leg platform, in particular to a method for hoisting and straightening tension tendons of a tension leg platform, and belongs to the field of offshore oil engineering. Background technique [0002] At present, the floating system used for deep water development includes: single column platform, semi-submersible platform, floating production storage and offloading device, tension leg platform and other structural forms, among which the tension leg platform is a typical The types of production platforms for oil and gas development have been widely used. The tension tendon is one of the key equipment of the TLP, its hoisting, righting construction, and offshore installation are important links in the construction of the TLP, and even the key steps that affect the offshore installation of the TLP. [0003] The tension tendon is one of the main components of the TLP, which plays the role of mooring the TLP, providing suff...

AI Technical Summary

Problems solved by technology

The tension tendons of the tension leg platform are usually divided into upper section, main section and bottom section, which mainly include: adjustment section, buoy ring, main pipe, male and female head, transition section, bottom connector and other structural components. During installation, due to the effects of wind, waves, currents and the influence of the main ship shaking, the tension tendons are prone to collision damage during the righting process. This situation is more prominent when the environmental conditions are harsh, which increases the construction cost. Operational risk; and because the manufacturing materials are relatively expensive and the welding process is relatively difficult, its cost is relatively high. At the same time, because it is a precision instrument and equipment, it has high requirements for its safe construction and protection

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