Numerical Simulation And Optimization Of Horizontal Well Fracturing In Low Permeability Reservoir

China’s energy situation is grim.The proportion of low-permeability oil and gas production scale in the overall oil and gas production scale is more than half,and the proportion of proved reserves in the total proved reserves is increasing day by day.How to improve the development capacity of low-permeability oil and gas resources has great practical value.As a whole,the heterogeneity of block m is very strong,and the connection between the reservoir and the reservoir is not good,resulting in the actual production situation is not good,so fracturing is needed to assist the production.According to the characteristics of block m,this paper establishes a three-dimensional model,uses ABAQUS to simulate the change curve of fracture width,pore pressure and bottom hole pressure with time;uses FracproPT to simulate the fracture shape;and carries out corresponding optimization and design in different fracture parameter selection.This paper mainly carried out the following work:(1)The two-dimensional model and three-dimensional model as well as the boundary conditions and other data are established to complete the basic modeling work,and then the detailed fracture processing and subsequent encryption scheme are carried out.There are 16000 grids in total,and the grid in two directions of two-dimensional plane is 50 m,and the vertical direction is 2m,so as to establish the required fracturing model.(2)FracproPT was used to simulate the fracture morphology,and the curves of fracture width,fracturing fluid displacement and proppant concentration with time were obtained.(3)This paper systematically analyzes the direct influence of fracture parameters of sand body on productivity,and optimizes fracture parameters of heterogeneous reservoir from the aspects of saturation of gas permeability and gas permeability of vertical reservoir,comprehensive establishment of fracture model of horizontal heterogeneous sand body,connectivity between two sets of materials and sand body,and distribution model of fracture with poor connectivity of multiple sets of sand bodies.(4)It is found that the reservoir in block m should be dominated by transverse fractures.After horizontal well pressure,the productivity of block m is affected by many factors.The effective permeability of reservoir is the most critical factor,followed by fracture parameters.In the fracture parameters,the fracture shape,number and length have great influence.In this paper,two kinds of unconnected reservoir models are established to simulate the production results under the influence of different fracture parameters,analyze the influence of different values of the same parameter on the results,and obtain the parameter optimization results.