Study On Shale Gas Horizontal Well Staged Fracturing Parameters Optimization With Considering The Induced Stress

Shale reservoir has low porosity,low permeability and poor connectivity feature.Application of horizontal well staged multi-cluster fracturing for shale gas reservoir can maximum increase the contact area of horizontal wellbore and reservoir,improve the use level of reservoir,ultimately achieve the goal of improving single well production capacity.The key to the successful hydraulic fracturing in shale reservoir is whether the working communicates the artificial fractures with the natural fractures and forms fracture network or not.The complexity of fracture directly affects the stimulation effect of single well after fracturing.This paper is on the basic of fuling area,analyzing the factors affecting the compressibility,optimizing the fracturing position firstly on the basis of reservoir characteristics.Based on the two-dimensional plane strain model,combined with knowledge of elastic-plastic mechanics,this paper establishes the mathematical model of the induced stress and uses the RFPA^2D-Flow to do the numerical simulation,analyzes the effect of induced stress and extension of fractures to determine the optimal fracturing cluster spacing,finally forms fracture network and improves the fracturing effect.This paper optimizes the fracture parameters and the construction parameters of shale gas horizontal well staged fracturing and makes a preliminary assessment of the fracture complexity for three fractured wells.The results provide certain technical support for the follow-up development of fuling area.