筠连煤层气井产出水化学特征及意义

Chemical Characteristic of Produced Water of JunLian CBM Well and Its Intention

煤层气井生产采用排水降压方式实现产气,通过跟踪分析采出水化学特征动态变化规律,认识煤储层排采的规律性,以及水性达到稳定后煤层水真实化学组成。根据对煤层水在研究区内的分布特征研究,确定影响水性在平面及纵向上变化的主要控制因素。探索了煤层水化学特征与含气量、产水量的相关性,划分出水系统两种类型,对于煤层气开发生产具有一定指导意义。

CBM is usually produced through draining water and decreasing pressure based on the tracing and analysis of the dynamic variation pattern of chemical characteristic on the produced water,the paper figures out the drainage regularity of coal reservoir and the actual chemical composition of underground water under the stable stage.According to the distribution of underground water in the study area,the main reason of the water type changed on the planar and longitudinal surface is identified.The paper explores the correlation between chemical composition and gas content,water production,and classifies two types of water systems in the coal reservoir,which is of guiding significance for CBM development.