摘要
为提高煤层压裂效果,采用拟三维裂缝延伸模型,系统全面分析了岩石物性参数(弹性模量、泊松比、断裂韧性)、地应力差、产层厚度、施工条件(排量、黏度、压裂液滤失性)等对裂缝几何形态的影响。结果表明:应力差、排量、产层厚度等与缝长、缝宽成正相关;弹性模量、泊松比、断裂韧性、排量、黏度等与缝高成正相关;滤失与缝高、缝长、缝宽三者成负相关。此研究结果对获取理想的裂缝几何形态有重要的理论指导意义。
Pseudo-three dimensional fracture extension model has been used to analyze the effects of petrophysical parameters(including elastic modulus,Poisson’s ratio and the fracture toughness),differential stress,pay zone thickness,operation conditions(including rate,viscosity,fluid loss) on hydraulic fracture geometry in order to improve coal bed fracturing effect.The results show that both fracture length and width are positively correlated to differential stress,rate and pay zone thickness;the fracture height is positively correlated to elastic modulus,Poisson’s ratio,fracture toughness,rate and viscosity;and the fluid loss is negatively correlated to fracture height,length and width.The results of this research have important theoretical significance to acquiring ideal fracture geometry.
出处
《特种油气藏》
CAS
CSCD
北大核心
2013年第2期126-129,157,共4页
Special Oil & Gas Reservoirs
基金
国家科技重大专项"大型油气田及煤层气开发"(2011ZX05037-004)
关键词
煤层气
水力压裂
裂缝
几何形态
影响因素
CBM
hydraulic fracturing
fracture
geometry
influencing factor
analysis
