Mechanism Research on Fracture Propagation by Stimulated Reservoir Volume(SRV)in Shale Reservoirs

摘要

Due to the extremely low matrix porosity and permeability,developed natural fractures and high brittleness of shale reservoirs,complex network fractures are generally created through carrying out large-scale hydraulic fracturing for high recovery efficiency.In order to investigate the propagation of complex fracture network,a 3-D numerical simulation model is built based on finite element coupling with discrete element method.The numerical simulation results are in good accordance with laboratory experiment,which prove the reliability of the numerical model.With the model in the paper,the feasibility of stimulated reservoir volume(SRV)in shale reservoir were conducted from geological parameters and hydraulic engineering parameters.At the same time,the influence of horizontal differential principal stress,Yang's modulus of rock,displacement rate,the angle between natural fracture and the horizontal maximum principal stress,et al.on average fracture width,SRV,fracture complicated index(FCI)were studied by a series of simulations.The research results can offer some references for hydraulic fracture design and operation to shale gas in China.