页岩气井压后返排模式研究现状及认识

Present Situation and Understanding of Post-frac Flow-Back Model for Shale Gas Well

从国内外的对比分析来看,不同页岩区块的返排特征差异很大,其中原因有储层本身的因素,也有工程方面的因素。通过对比国内外在页岩气返排机理方面的一些研究认识,结合开展的龙马溪组岩心实验,对影响页岩气井返排的因素,诸如储层岩石的层理发育状况,矿物组成,相对渗透率,毛管力,裂缝的应力敏感,以及压裂液性能、地面返排控制等进行分析,对页岩气井返排模式的合理制定和优化有一定借鉴意义。

From comparison and analysis at home and abroad,flow-back characteristic difference of different shale block is very big,and the reasons of it have the reservoir itself factors,also have engineering factors. By comparing some domestic and foreign research in shale gas recovery mechanism,combined with core experiments of Longmaxi group,factors affecting the backflow of shale gas well,such as reservoir rock bedding development status,mineral composition,relative permeability,capillary force,fracture stress sensitivity,and fracturing fluid flow-back performance,ground control are analyzed,has a certain referencing significance for reasonable formulation and optimization of shale gas well.