煤层气集输管网积液在线监测及处理技术

Online Monitoring and Processing Technology of Liquid Accumulation in Coalbed Methane Gathering Pipeline Network

在沁水盆地各煤层气生产老区块中井口压力逐年降低,管道输送压力逐渐变小,气体流速减小,煤层气所携带饱和水至集输管道,饱和蒸汽因温度降低使得凝析水增加,造成集输管道中积液现象明显,目前行业传统工艺不能从根本上解决管道中积液问题。通过集输管网积液在线监测试验,验证了集输管网在3种不同铺设形态(直管段、斜坡式、S斜坡式)下积液预防性返排的准确时机,解决了集输管网积液精确预警问题。通过对便携式集输管网积液返排装置的现场实践,该积液返排装置的经济性、便捷性及积液返排的彻底性,从根本上解决了集输管网积液冬季冻堵问题。

In the old coalbed methane production blocks of Qinshui Basin,the wellhead pressure has been decreasing year by year,and the pipeline transportation pressure has gradually reduced,leading to a decrease in gas flow rate.The saturated water carried by coalbed methane is transported to the gathering pipeline.Due to the decrease in temperature,the saturated steam increases the condensate water,resulting in significant liquid accumulation in the gathering pipeline.At present,the traditional process of the industry can not fundamentally solve the problem of liquid accumulation in pipelines.Through the online monitoring test of the liquid accumulation in the gathering pipeline network,the accurate timing of the preventive flow back of the liquid accumulation in the gathering pipeline network under three different laying forms(straight pipe section,slope type,S slope type)is verified.This approach effectively addresses the problem of accurate early warning of the liquid accumulation in the gathering pipeline network.The field practice of the portable liquid return device of the gathering pipeline network demonstrates the economic feasibility,convenience,and thoroughness of the liquid return device,fundamentally resolving the problem of freezing and blocking of liquid in the gathering pipeline network in winter.