海底长距离湿气管线清管流动规律及方案优化
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青岛科技大学机电工程学院

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Research on pigging plan of long-distance wet gas pipeline
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School of Mechanical and Electrical Engineering, Qingdao University of Science and Technology

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    摘要:

    针对长距离湿气管线清管时出现的清管器速度过快、管道终端出现过高液体峰值、提高过量输量造成能耗增加等问题。本文基于OLGA软件建立长距离湿气管线清管模型,研究不同的输量提升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入口压力、清管器速度、终端累积液量的变化规律。研究结果表明,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;输量越高,清管器平均速度越高,入口压力震荡越小,终端瞬时液量峰值越小,但清管器瞬时速度在中等输量时最快。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20万方输量上调至28万方、清管器清管作业时将输量下调至42万方清管效果最佳。

    Abstract:

    Aiming at the problems such as too fast pigging speed when pigging of long-distance wet gas pipelines, excessive liquid peak at the end of pipeline, and increased energy consumption caused by excessive gas input volume, etc.. In this paper, a pigging model of long-distance wet gas pipeline is established based on OLGA software, and the influence of different gas input volume increases on the inlet pressure and liquid accumulation volume of hydraulic pigging pipeline is studied, as well as variation law of inlet pressure, pigging speed and liquid accumulation at the end of 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 accumulative volume in the pipeline ,but it is not obvious when input volume reaches a certain range; For pig pigging, the more the gas input volume, the higher the average velocity of pig is, the lower the inlet pressure shock is, and the smaller Sthe peak value of the instantaneous liquid volume is. But the pig pigging’s instantaneous velocity is the fastest at medium input volume. According the results of the gas field, during hydraulic pigging operations, the output of 200,000 cubic meters should be increased by 280,000 cubic meters for the best pigging effect, and the pig pigging operations should be adjusted to about 300,000 cubic meters.

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  • 收稿日期:2021-03-15
  • 最后修改日期:2021-04-21
  • 录用日期:2021-04-23
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