A new pigging approach with SDS (Sodium dodecyl sulfate) surfactant was proposed for foam drainage in the gathering pipelines with wet gas production, especially for the pipeline section with a great pigging risk. For this purpose, the loop of gas-liquid two-phase flow with a 3 ° slightly upward pipeline was designed. The flow pattern characteristics of gas-liquid two-phase flow were collected by a high-speed camera, and the flow patterns with typical morphological structure were classified. Ultrasonic Doppler velocimeter and ultrasonic transducer were used to measure the velocity signal of the liquid phase near the pipe, and the slug frequency was calculated accurately according to the change of velocity profile data. The slug length was measured by the signal collected by pressure and differential pressure transmitter. The results show that with the addition of SDS surfactant, the flow pattern of gas-liquid two-phase flow is obviously improved, and the working condition of slug flow is suppressed. Besides, in the specific slug flow condition, the slug frequency decreases significantly and the slug length increases. It indicates that the addition of SDS surfactant is favorable to liquid discharge, and provide a reference value for the application of SDS surfactant in foam drainage in wet-gas gathering pipelines.

针对湿气生产集输管道泡沫排放，提出了一种新的SDS（十二烷基硫酸钠）表面活性剂清管方法，特别是对清管风险较大的管段。为此，设计了3°微向上管道的气液两相流回路。通过高速相机采集气液两相流的流型特征，对具有典型形态结构的流型进行分类。采用超声多普勒测速仪和超声换能器测量管道附近液相的速度信号，根据速度剖面数据的变化准确计算段塞频率。段塞长度由压力和差压变送器采集的信号测量。结果表明，加入SDS表面活性剂后，气液两相流的流型得到明显改善，段塞流工况得到抑制。此外，在特定段塞流条件下，段塞频率显着降低，段塞长度增加。表明添加SDS表面活性剂有利于排液，为SDS表面活性剂在湿气集输管道泡沫排放中的应用提供参考价值。