低渗透砂泥岩互层储层水力压裂裂缝扩展规律分析OA

To study the law of hydraulic fracturing fracture propagation in low-permeability sandstone-mudstone interbedded reservoirs and clarify the extent of influence of various factors on this law,a numerical model of fracture propagation in such reservoirs was established using the three-dimensional discrete lattice method.The effects of minimum horizontal principal stress difference,fracture toughness,elastic modulus,Poisson's ratio,fracturing fluid displacement,and fracturing fluid viscosity on the fracture propagation law were analyzed,and the main controlling factors were identified based on the orthogonal design principle.The results show that the main controlling factors affecting the fracture area of low-per-meability sandstone-mudstone interbedded reservoirs are fracturing fluid displacement and minimum horizontal principal stress difference,fol-lowed by elastic modulus,fracturing fluid viscosity,and fracture toughness,with Poisson's ratio having the least influence;the main controlling factors affecting the fracture height of such reservoirs are minimum horizontal principal stress difference and elastic modulus,followed by fractu-ring fluid displacement,fracturing fluid viscosity,and fracture toughness,with Poisson's ratio having the least influence.