Optimization Design Of Volume Fracturing Parameters Of Horizontal Wells In Mahu Glutenite Reservoir

The Mahu tight glutenite reservoir is characterized by low porosity,low permeability and strong heterogeneity in the reservoir.It is necessary to explore new development methods to achieve effective utilization,which puts forward higher requirements for volume fracturing operation and parameter optimization of horizontal wells.Analysis of Geological Characteristics of Fracturing Reconstruction of Mahu Reservoir.The reservoir thickness is generally large,and the distribution of interbeds is uneven.The physical properties,rock strength and geostress direction of rocks are mainly studied.On the basis of reservoir physical properties,the fracture morphology and propagation law of glutenite reservoir are analyzed under the conditions of core scale,small physical model scale and actual stratum scale,which provides certain basis and guidance for subsequent fracturing construction.Firstly,according to the characteristics of reservoir fracture development,horizontal principal stress,elastic modulus and Poisson’s ratio,it is proved that reservoir brittleness is moderate,and horizontal well fracturing can be carried out by subdivision cutting;Secondly,a three-dimensional geological model and an engineering(in-situ stress)model are constructed to fully consider the heterogeneity of reservoirs,describe the distribution pattern of artificial fractures in three-dimensional space and key parameters such as fracture conductivity,and determine the main parameters affecting single well productivity and inter-well interference;Finally,based on the three-dimensional geological engineering model,the fracturing construction parameters are optimized by using the fracturing design process method.The construction parameters such as fracture half-length,fracture conductivity,fracture spacing and sand-adding scale are determined,and the field application is analyzed.The three-dimensional geological engineering model and the optimization design method of fracturing by stages established in this paper have certain guiding significance for the optimization and construction of fracturing parameters in Mahu tight glutenite reservoir.