海底混输立管段瞬态流动规律及其敏感性分析

利用OLGA 2000软件对某海底混输管道系统立管段瞬态流动规律及其敏感性进行了数值模拟分析,在立管底部、顶部以及管道入口、出口处压力波动很大,容易形成段塞流;采取适当减小立管管径、管道出口节流阀开度、多相流含水率以及增大管道出口压力、降低立管高度和增大多相流气油比等措施,可以在一定程度上减弱或消除立管中严重段塞流的影响。今后应加强数值模拟、试验模拟和理论计算等方法的综合研究,深入探讨海底混输管道立管段严重段塞流的形成机理,并探索经济、有效地控制和消除严重段塞流影响的措施。

The analysis of transient flow characteristics and sensitivity in the riser of subsea multiphase pipeline

OLGA 2000 software has been adopted to perform the numerical simulation for transient flow characteristics and sensitivity in the riser of a subsea multiphase pipeline. The simulation shows that the pressure fluctuates greatly at the bottom and top of riser as well as at the inlet and outlet of pipeline on the platform, where the slugging often occurs. The slugging in the riser can be attenuated or eliminated in a certain degree by reducing the diameter of riser, reducing the opening of outlet choke valve, decreasing the water cut of multiphase flow, increasing the outlet pressure, lowering the height of riser and increasing GOR of multiphase flow properly. It is recommended to enhance further the comprehensive studies on the methods of numerical simulations, test modeling and theoretical calculation; to inquire deeply into the mechanism of severe slugging formed in the riser of subsea multiphase pipeline; and to seek for the measures to control and eliminate the affects of severe slugging economically and effectively.