低渗透煤层提高瓦斯采收率技术现状及发展趋势

Present Situation and Development Trend of Gas Recovery Technology in Low Permeability Coal Seam

低渗透煤层压裂对于煤矿瓦斯防治以及降低煤矿事故发生率具有重要意义。详细阐述了四种低渗透煤层压裂技术的作用机理,分析了压裂技术以及压裂效果数值模拟上存在的问题,针对存在的问题,提出未来要研究适应中国煤层气储气特点的高效压裂液、支撑液及配套设施与装备;气体驱替发展应合理解决两种气体的协调关系;数值模拟应综合多种影响因素进行压裂效果模拟分析。

Fracturing in low permeability coal seam was of great significance to prevent and cure coal mine gas and reduce the occurrence rate of coal mine accident.The mechanism of four fracturing techniques in low permeability coal seam was described in detail.The fracturing technology and numerical simulation method were discussed and analyzed in detail.The problems in fracturing technology and numerical simulation of fracturing effect were analyzed.In view of the existing problems,it was proposed that the future study of high-efficiency fracturing fluid,supporting fluid and supporting facilities and equipment adapted to the characteristics of coalbed methane and gas storage in China;The future development of gas displacement should reasonably solve the harmonious relationship between the two gases,and the future numerical simulation should integrate many factors to simulate and analyze the fracturing effect.