Simulation Study On Fracture Propagation Of Hydraulic Fracturing Based On ABAQUS Platform

In order to study the law of fracture propagation in the reservoir during hydraulic fracturing and the mutual interference between fractures during the expansion process,a simplified model of numerical simulation was established based on the cohesive element,study and analyze the influence of different reservoir geological parameters and natural fracture development strata on hydraulic fracture propagation.Through comparison,it is found that the implementation of hydraulic fracturing in high-brittle reservoirs can improve the permeability of hydraulic fractures and has good compressibility;Through comparison;it is found that the implementation of hydraulic fracturing in high-brittle reservoirs can improve the permeability of hydraulic fractures and has good compressibility;At the same time,the high ground stress difference helps increase the fracture length,but has little effect on the fracture width;However,in the fractured formation,the mutual interference between the fractures under the higher stress difference is conducive to the activation of natural fractures in the formation,and then the interconnection forms a complex network of hydraulic fractures.Using the finite element method of expansion,the crack propagation trajectories under different crack parameters and different working systems are numerically simulated,and the variation law of the crack and the stress interference between the cracks are studied and analyzed.It is found that increasing the initial single fracture angle,the fracture deflection angle and fracture width and initiation pressure will increase in the early stage of hydraulic fracturing,but the fracture length will slightly decrease after the fracturing;The effect of stress interference between fractures is obvious during simultaneous fracturing of short-distance straight fractures,but there is no deflection in the initial stage of fracture initiation,and the greater the distance between fractures,the longer the straight line extension distance;When the short-distance oblique fracture is fracturing,a strong stress interference will form between the fractures,the fracture tip will deflect or it will stop expanding after closing,and the extension paths on both sides of the fracture will be asymmetric.The stress interference areas between multiple cracks overlap and change more drastically,which can change the crack width and crack propagation direction at different stages.In this paper,based on the ABAQUS platform for numerical simulation and analysis of the law of fracture propagation in the process of hydraulic fracturing,combined with the simulation results to evaluate the fracture propagation state in the process of hydraulic fracturing.For the development of fracturing in unconventional oil and gas reservoirs,this study can be regarded as a simple and effective method,which can more accurately control the fracture propagation by reference.