Marine floating type drilling riser flexible hanger

Abstract

The invention discloses a marine floating type drilling riser flexible hander which mainly comprises a chuck-universal joint assembly, a motion compensation device, a guide mechanism and a hydraulic power unit. The chuck-universal joint assembly is combined by adopting an embedded structure, suspension and up-down of a water string can be achieved, and it is ensured that the chuck swings by a certain angle along with a riser; a distance-increasing type motion compensation hydraulic cylinder is adopted on the motion compensation device to drive the chuck-universal joint assembly to do compensation motion. The guide mechanism ensures that the chuck-universal joint assembly does rectilinear motion along a guide rail through sliding fit of a sliding block installed on the chuck-universal joint assembly and the guide rail, and the radial load of the riser is borne. The hydraulic power unit provides power and control for the whole device. On the basis of achieving the conventional suspension and up-down operation function, the system structure height is lowered, the riser suspension operation step is simplified, suspension time is shortened, the variation amplitude of the load in the riser is lowered, and the suspension performance and reliability of the riser are improved.

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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