天然气管道在投产前对管道进行干燥作业，可以抑制投产过程中产生水合物、防止管道腐蚀或管道内天然气的流动性等问题。东方13-2海底24″输气管道长195公里，作业船舶需在台风、季风季期间完成海上施工，连续作业天气窗口较短。为保证在作业天气窗口内尽快完成海管干燥作业，采用干空气、干燥剂、凝胶组成的干燥列车，一次性完成海管淡水除盐、管道排水、管道吹扫干燥等作业，提高了作业效率。优化了直板清管器的尺寸、聚氨酯硬度，清管器列车的成功收取，检验了其耐磨度及密封性，能够满足长距离管线干燥通球的要求。

 The drying of natural gas pipelines before production can prevent hydrate formation， pipeline corrosion and the fluidity of natural gas in pipelines. DF 13-2 subsea 24″ pipeline is 195 kilometers long， and the vessels need to complete offshore construction during typhoon and monsoon seasons， and the weather window for continuous operation is short. In order to complete the drying operation of the sea pipe as soon as possible in the operating weather window， the dry train composed of dry air， Desiccant and Gel is adopted to complete the fresh water desalination， pipeline drainage， pipeline purging and drying and other operations of the sea pipe at one time， so as to improve the operating efficiency. The size of the pig and the hardness of polyurethane were optimized， and the pig train was successfully collected. The abrasion resistance and tightness of the pig were tested， which could meet the requirements of longdistance pipeline drying.