水动力段塞诱导的柔性立管振动响应实验研究

Experimental investigation on slug flow-induced vibration of catenary flexible riser

柔性立管作为海洋油气开采连接海床与海面的关键纽带,发挥着至关重要的作用,但也面临着内部油气段塞流诱发的振动威胁。该文实验研究了水动力段塞流诱导的柔性立管振动响应,利用高速摄像非介入同步采集柔性立管的振动位移及管内两相流动特性。实验发现:柔性立管的振动主要发生在平面内,且两个方向的振动相互关联;两个方向的模态转换在时间上同步,但在空间上存在差异性;柔性立管的振动幅度与管内通过的液塞长度有关,而模态转换与管内段塞单元的重现频率有关。

Flexible riser,as a crucial facility in deep-sea oil and gas exploitation,takes the responsibility of transporting oil and gas from the seabed to platform.Nevertheless,the slug flow induced vibration(SIV)potentially formed by the combination of oil and gas brings fatigue damage.The present study experimentally investigates the SIV of a catenary flexible riser.The vibration displacement and flow characteristics of the internal slugs were captured simultaneously by a non-intrusive measurement.The experimental results indicate that the SIV mainly occurs in the curvature plane of the riser,and the responses in the two directions of the plane are interdependent to each other.The mode switching is temporally synchronous in the two directions while presenting spatial difference.The response amplitude and mode switching are related with the variations of slug length and recurrence frequency,respectively.