Pigging Simulation Analysis of Deepwater Gas Tieback Flowlines in South China Sea

摘要

Pigging operation is an important part of flow assurance for deepwatertieback pipeline. In this paper, OLGA software is used to simulatepigging transient flow characteristic of a 79km dual flowlines system ofa deepwater gas field. Simulation before pigging shows that low centralplatform (CEP) pressure can decrease minimum stable flow rate. Inproduction late, properly reducing CEP pressure and keeping mixinggas flow rate of recycle gas(RG) and full wellstream (FWS) asminimum stable flow rate can improve pipeline flow assurance. Duringpigging it can also reduce total liquid volume, gas supply MEG makingup. Meanwhile efficient measures are adopted to handle liquid such asusing CEP closed drainage system.