摘要
利用深水混合立管系统模拟流动实验装置进行了严重段塞流的注气控制模拟实验,结果表明,在立管底部进行气举法控制可以减小流型图中不稳定流区域,并能明显减小管内压力大小和波动幅度,但过大的注气量会增大柔性管段的摩阻损失,使整个立管系统的压力增大,对流动反而不利。根据实验中管内压力随注气量增大的变化趋势的不同,将混合立管系统的气举控制过程分为4个阶段,不同控制阶段垂直立管内流型有所不同;注气控制不能完全消除深水混合立管系统中的不稳定流,但将垂直立管流型控制在段塞流与过渡流分界处时可达到较好的控制效果。
An experiment is carried out in a flow experiment rig of deepwater freestanding riser system to simulate severe slugging elimination by gaslift. It is found that injecting gas at the base of the riser can reduce the area of unstable flow on the flow regime map fluctuation in the and the pressure and pressure riser system, but excessive gas injection will increase the friction loss of flexible pipe and the pressure of the whole riser system, causing negative production. According to the change trend of pressure of the system with the flow rate of injected gas, the gas-lift control process of the freestanding riser system is divided into four stages with different flow patterns in the vertical rise. Gas-lift cannot eliminate the unstable flow in the freestanding riser system completely, but can control the flow pattern in the vertical riser at the boundary of hydrodynamic slug flow and transition flow to attain the best flow control performance.
出处
《中国海上油气》
CAS
北大核心
2012年第4期80-83,共4页
China Offshore Oil and Gas
基金
国家科技重大专项"自由站立式立管系统工艺设计方法研究(编号:2008ZX05030-005-12)"部分研究成果
关键词
气举法
深水混合立管
严重段塞流
流动控制
实验研究
gas-lift
deep water freestanding riser
severe slugging
flow control
experimental study