海底长距离湿气管线清管流动规律及方案优化

针对长距离湿气管线清管时出现的清管器速度过快、管线出口液体峰值过高、提高输量造成能耗增加等问题，基于OLGA软件建立长距离湿气管线清管模型，研究不同输量对水力清管管线入口压力、积液量的影响，研究不同输量下清管器作业时管线入口压力、清管器速度、管线出口累积液量变化规律。研究结果表明：在水力清管时，输量提升越多管线内积液量越低，但超过一定范围输量提升对积液量影响不明显；在清管器清管时，输量越大，管线入口压力振荡越小，清管器平均速度越高，管线出口瞬时液量峰值也越小。针对某气田进行清管瞬态模拟，结果表明，水力清管作业时将20万m3输量上调至28万m3、清管器清管作业时将输量下调至42万m3清管效果最佳。

Flow Rule of Long-Distance Subsea Wet Gas Pipeline Pigging and Scheme Optimization

Aiming at the problems such as too fast the pigging speed, excessive liquid peak at the outlet of the pipeline, increased energy consumption caused by increased gas input volume, etc. during the pigging of long-distance wet gas pipelines, a pigging model of long-distance wet gas pipeline is established based on OLGA software, and the influence of different gas input volume on the inlet pressure and liquid accumulation volume of hydraulic pigging pipeline is studied, and the variation rules of inlet pressure, pigging speed and liquid accumulation at the outlet of the pipeline during pig pigging operation is also studied. The results show that: for hydraulic pigging, the more the gas input volume, the lower the liquid accumulation volume in the pipeline, but it is not obvious when the gas input volume reaches certain range; for pig pigging, the more the gas input volume, the lower the inlet pressure vibration is, the higher the average velocity of the pig is, and the smaller the peak value of the instantaneous liquid volume at the outlet of the pipeline is. The pigging transient simulation is carried out for a gas field. The results show that the pigging effect is the best when the gas input volume is increased from 2.0×105 m3 to 2.8×105 m3 during hydraulic pigging and reduced to 4.2×105 m3 during pig pigging.