Device and method for restraining vortex-induced vibration of marine riser through upward-going energy of drilling fluid

Abstract

The invention relates to a device and method for restraining vortex-induced vibration of a marine riser through upward-going energy of drilling fluid. The device is composed of a transmission system, a supporting system and flow disturbing rods. The flow disturbing rods are arranged in an axial symmetry mode with respect to the axis of the marine riser. Impellers of the transmission system are mounted in the annular space between the marine riser and a drill column. The impellers are driven to rotate when drilling fluid goes upwards, the impellers drive worms to rotate, the worms then drive worm wheels to rotate, and the worm wheels finally drive the flow disturbing rods to rotate. The flow disturbing rods are supported and fixed through the supporting system. Through rotation of the flow disturbing rods on the two sides of the marine riser, the wake region behind the marine riser is narrowed, detour flow lift force and resistance on the marine riser from ocean currents are lowered, and therefore vortex-induced vibration is restrained. The flow disturbing rods are driven to rotate through kinetic energy generated when drilling fluid goes upwards, externally provided energy is not needed, and the purposes of low cost and zero energy consumption are achieved.

Description

technical field [0001] The invention belongs to the technical field of offshore oil and gas engineering, and in particular relates to a device and a method for suppressing vortex-induced vibration of a water riser by utilizing the upback energy of drilling fluid. Background technique [0002] In offshore oil drilling, the riser is one of the core components. It constructs the transmission channel between the drilling platform and the underwater wellhead. Exercise etc. play an important role. The riser is subject to complex marine environmental loads such as wind, waves, and currents, and is prone to fatigue failure. Among them, the vortex-induced vibration of the pipe body caused by the flow around the wave flow is the main cause of the fatigue damage of the riser. Vortex-induced vibration is a complex fluid-solid coupling problem. Especially when the frequency of vortex shedding is close to the natural frequency of the pipe string, it will also cause vortex-induced resona...

AI Technical Summary

Problems solved by technology

Active suppression has not been adopted in actual engineering due to the need to consume additional energy

Although passive suppression can achieve a certain suppression effect, the added auxiliary structure often increases the flow resistance and changes the weight of the pipe string itself to a certain extent, and most passive suppression structures cannot cope with the incoming flow with changing directions.

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