Geological Characteristics And Fracturing Parameters Optimization Of Chang 8 Oil Reservoir In Xun Yi Exploration Area

The geological study of XunYi exploration area is weak,the effect of fracturing test is unsatisfactory,and it is unable to meet the actual development requirements.It is urgent to carry out geological recognization and optimization of fracturing parameters.In this paper,through the observation of core observation and log analysis,we have established single well phase and well phase profile to analyze the stratum characteristics and sedimentary characteristics of the Chang 8 reservoir in the XunYi exploration area.We found that Chang 8reservoir sand-mud interbed phenomenon is serious and the oil layer is thin.Strong homogeneity.According to the experimental observations of scanning electron microscopy(SEM)and cast thin sections,the Chang 8 reservoir is a low-porosity,low-permeability reservoir.The pores are mainly intergranular pores formed by the dissolution of feldspar,rock debris,and cement,and the porosity distribution is relatively uniform.Through rock mechanics experiments,the elastic modulus,Poisson's ratio,bulk modulus,shear modulus,tensile strength,and compressive strength of rock in the Chang 8 oil reservoir are obtained.These rock mechanical parameters need to be entered into the fracturing parameters by the three-dimensional fracturing software FracproPT optimization.The fracture length was first optimized using the three-dimensional fracturing software FracproPT.The length of the optimized fracture was taken as the desired length,and at the same time the extension of the fracture height was controlled to prevent the formation from passing through the fracture.Input drilling parameters,perforation parameters,rock mechanics parameters,reservoir parameters,physical properties parameters,fracturing fluid performance parameters,and proppant selection of the corresponding reservoir,and simulate the calculation by continuously changing the fracturing parameters.Finally,the fracturing is performed by the software.Analysis module for optimization of fracturing construction parameters.The final optimization results are:oil layer thickness 4m~7m,displacement 1.8m~3/min,sand carrying liquid volume 54.79m~3,sand adding volume 16m~3,front liquid volume 16.37m~3,oil layer thickness 7m~10m,displacement 2.0 m~3/min,carrying sand volume 62.19m~3,sand volume 18m~3,pre-liquid volume 18.58m~3...