School of Mechanical and Electrical Engineering, Qingdao University of Science and Technology
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.