Geomechanics and Fracturing Parameter Optimization of Buried Hill Reservoir in Pearl River Mouth Basin
As a buried-hill oil and gas reservoir in Zhuyi Hollow of Pearl River Mouth Basin,Huizhou 27-1 well area has large thickness of fractured interval,multiple layers,strong heterogeneity,and great difficulty in fracturing reconstruction.Therefore,it is difficult to under-stand the expansion and extension law of artificial fractures in buried-hill reservoir.In order to solve this problem,the dynamic parameter logging interpretation model was first established,and the static rock mechanics data was co-corrected to establish a one-dimensional rock me-chanics profile.Combined with the deep diagenesis theory,a three-dimensional geomechanical model was established to simulate the diage-netic environment of the block.Finally,based on the three-dimensional geomechanical model,the influences of parameters such as displace-ment,fluid volume,sand ratio,pre-fluid ratio and perforation zone thickness on the longitudinal and plane extension of fractures were studied to optimize the fracture design.The results show that the mean value of Young's modulus is 45.47 GPa,the mean value of maximum horizontal prin-cipal stress is 100.91 MPa,the mean value of minimum horizontal principal stress is 80.98 MPa,and the mean value of Poisson's ratio is 0.30 in Huizhou 27-1 block.The optimal construction parameters are 6～7 m3/min displacement,600～700 m3 fluid volume,10%～15%sand ratio,50%～60%pad fluid ratio and 8～11 m perforation thickness,which provide guidance for on-site construction.
Pearl River Mouth Basinburied hill reservoirgeomechanicsfracturing parameter optimizationnumerical simulation
万方数据
维普
