Research On Optimal Design Of Fracturing Cracks In Horizontal Wells In Tight Oil Reservoirs In Jimsar

The Jimsar reservoir has complex reservoirs and complicated geological conditions.It is difficult to develop and it requires fracturing to obtain a certain amount of production.However,due to factors such as ground stress,the fracturing is greatly constrained.Therefore,based on the study of the influence of geological characteristics,ground stress and fracturing parameters on the fracturing effect,the fracturing parameters of horizontal wells are optimized,and a more reasonable fracturing scheme is designed to provide a certain basis for fracturing construction.Firstly,according to the characteristics of reservoir reservoirs such as fracture development,horizontal principal stress,elastic modulus,and Poisson's ratio,it is demonstrated that the reservoir brittleness is moderate,and fracturing can be used to perform horizontal well fracturing;A dual reservoir model for reservoirs is established and the fracturing parameters are optimized using the equal connectivity coefficient method.Combined with the orthogonal design test method,the fracturing fracture parameters are simulated as fracturing series:27,and the number of fracturing clusters:3 clusters.Half length of crack:210m,diversion capacity:0.2?m~2·m,crack width:0.009m;Again,fracturing design is performed according to the preferred parameters,field tests are conducted,and simulation results similar to those obtained after fracturing crack optimization are obtained.Accumulative oil production can verify the accuracy and reliability of the model.Finally,the optimization of fracturing fracture layout of two parallel horizontal wells is carried out.The results shows that the crack staggered distribution model is suitable,and finally the crack length of the fracturing well is determined.Complementary fracturing is the optimal solution.The method and process of fracturing fracture parameters optimization established in this paper have certain guiding significance for the optimization and construction of fracturing parameters in the tight reservoir of Jimsar.