复合抑盐剂除盐解堵技术在输气管线中的应用

The Application of the Technology of Desalting and Plugging in Gas Transmission Pipeline with Compound Salt Inhibitor

摘要: 由于气井地层水矿化度高，天然气携带高矿化度的地层水进入输气管线而导致管线堵塞。再加上集输管线温度降低、压力下降等外界条件变化或干气浓蒸等效应的影响，集输管线中形成大量盐垢，造成管线堵塞而集输效率大大降低甚至被迫关井。研究通过分析了须家河气藏地层水的理化性能，研究出复合防盐剂配方：0.4%增溶剂CJ-ZRJA + 0.08%盐晶畸变剂 + CJ-JBJB + 0.01%分散剂 + CJ-FSJC + 0.01%表活剂CJ-BHJD。结合集输管线距离长、高低起伏、停气作业要求时间短等特点，采用水力冲刷、抑盐剂浸泡、清管排液的工艺技术，成功解除了蓬莱4井至蓬莱116井管线和女深002-6-X1至女112井管线2条输气管线的堵塞，恢复了管线的正常集输。

Abstract: Due to the high formation water salinity in gas well, the gas carries the formation water with high salinity into the gas transmission pipeline, which leads to the pipeline blockage. Moreover, the influence of external factors including temperature reduction, pressure reduction or evaporation of concentrated dry gas, a large amount of salt scale is formed in the gathering and transportation pipelines, which results not only in the pipeline blockage, but also the gathering and transportation efficiency is greatly reduced or even leads to well shut-down. Based on the analysis of the physical and chemical properties of formation water in Xujiahe gas reservoir, a salt suppressant was formulated as follows: 0.4% solubilizer CJ-ZRJA + 0.08% salt crystal distortion agent, CJ-JBJB + 0.01% dispersant, and CJ-FSJC + 0.01% surface active agent CJ-BHJD. In combination with the characteristics of long distance, high and low undulations, and short time required for gas shut-down operation, the technology of hydraulic scouring, salt suppression agent soaking and pigging drainage was adopted to successfully mitigate the blockage of pipeline from Penglai 4 to Penglai 116 and the pipeline from Nvshen 002-6-x1 to Nvshen 112, which favors the restoration of the function of gas pipeline.