煤层气储层裂缝起裂机理研究

摘要

Coal bed methane reservoir is a kind of low permeability unconventional reservoir, and the hydraulic fracturing technology is the key to the industrial development of coal bed gas. By the mechanical calculation and analysis of the uncased wellbore stress, the wall stress of perforation, the underground fracturing pressure after perforation, and combined the compre-hensive analysis of the phenomenon of holding pressure and formation conditions in the process of crack initiation, the related factors that influence the fracture of the coal bed gas reservoir are obtained.%煤层气藏是一种低渗透非常规储藏，水力压裂技术是煤层气获得工业性开发的关键。通过对裸眼井筒应力、射孔孔眼壁面应力、射孔完井井下破裂压力等力学计算分析，结合裂缝起裂过程中的憋压现象和地层条件综合分析得到影响煤层气储层裂缝起裂的各相关因素。