水下应急封井装置内部冲蚀磨损数值模拟

Numerical Simulation on the Erosive Wear inside the Subsea Capping Stack

水下应急封井装置是一种应急抢险设备,用于水下井控失败后的抢险救援。为了解水下应急封井装置在不同工作状态下的磨损情况,对不同工况下应急封井装置的内部流动进行了CFD数值模拟。通过分析5种工况下内部管道的磨损率分布,确定磨损较严重的位置,并对其结构进行了优化。分析结果表明:主垂直管开启(工况1和工况2)时,最大磨损率较小,磨损主要分布在主垂直管的分流孔附近;主垂直管关闭时,最大磨损率明显增大,磨损严重的位置位于直角管下游管道外侧壁面,以及直角管内侧拐角处;将直角管结构改为盲三通可以显著减小该处的磨损率。所得结果可为水下应急封井装置的结构设计和优化提供一定参考,有助于加快我国水下应急装备的研究进展。

Subsea capping stack is a kind of emergency rescue device and it is used for emergency rescue after the failure of underwater well control.In order to understand the wear situations of subsea capping stack under different working conditions,its internal flow under different working conditions was numerically simulated using CFD.The severely worn positions were determined by analyzing the distribution of the wear rate inside the pipeline under five working conditions.In addition,its structure was optimized.The analysis results show that when the main vertical pipe is opened(working condition 1 and 2),the maximum wear rate is lower and the wear is mainly distributed near the diversion hole of the main vertical pipe;when the main vertical pipe is closed,the maximum wear rate is increased obviously and the severely worn positions are located on the outer side wall surface of the downstream of the right angle pipe and the inner corner of the right angle pipe;and replacing the right angle pipe structure with the blind tee can significantly reduce the wear rate there.The research results can provide a reference for the structural design and optimization of the subsea capping stack and are conducive to speed up the research progress of subsea emergency devices in China.