Offshore floating drilling riser flexible hanger

Abstract

The invention discloses a flexible hanger for a marine drilling riser, which mainly includes a chuck-universal joint assembly, a motion compensation device, a guide mechanism and a hydraulic power unit. The chuck-universal joint assembly adopts a mosaic structure combination, which can not only realize the suspension and lifting of the riser string, but also ensure that the chuck can swing at a certain angle with the riser. The motion compensation device adopts the extended range motion compensation The hydraulic cylinder drives the chuck-universal joint assembly to perform compensation movements, and the guide mechanism slides and cooperates with the guide rail through the slider installed on the chuck-universal joint assembly to ensure that the chuck-universal joint assembly moves along the guide rail. Linear motion, and bear the radial load of the riser; the hydraulic power unit provides power and control for the whole set. On the basis of meeting the conventional suspension and lifting operation functions, the structural height of the system is reduced, the operation steps of the riser suspension are simplified, the suspension time is shortened, and the variation range of the load inside the riser is reduced, and the suspension of the riser is improved. performance and reliability.

Description

technical field [0001] The invention relates to a hydraulic control system characterized by structural improvement and electro-hydraulic control technology, in particular to a flexible hanger for a water riser of an ocean drilling platform. Background technique [0002] As oil exploration and development move towards the ocean, especially the deep sea, the offshore floating drilling platform has become one of the important equipments in the oil industry. Drilling riser is an important but weak link in offshore drilling equipment, which has the characteristics of high technology, high investment and high risk. Due to the complexity of the operation process and load, the large deformation nonlinearity of its own structure, the uncertainty of the analysis method, the abstraction of the actual response and other factors, the drilling riser has become the difficulty and focus of offshore oil equipment. Ensuring the safety of drilling risers is an inevitable requirement for offsh...

AI Technical Summary

Problems solved by technology

However, during soft suspension, the heave motion amplitude of the drilling platform cannot exceed the stroke limit of the expansion joint or the tensioner, otherwise the safety of the riser suspension will be threatened

At the same time, the use of soft suspension requires switching from hard suspension to soft suspension, which is cumbersome to operate and is not conducive to personnel safety.

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