Based On Configuration Parameters Characteristics Fluid Mechanics Theoretical Research Of Low-permeability Heterogeneous Reservoir

Recent studies on low-permeability reservoir and extra low-permeability reservoir are the emphasis and sticking point in future exploitation both domestic and abroad.While the research on how the heterogeneous impact the production of low-permeability reservoir is of uppermost priority.Not only does this research has a certain prospect in applying in future oilfield exploitation,but it is also significant in developing the percolation model theory of heterogeneity in low-permeability reservoir,studying the rules and mechanism between the capacity of low-permeability reservoir exploitation and the start-up pressure gradient,and it also plays a significant role in promoting the growth of the percolation model theory of heterogeneity in low-permeability reservoir.Firstly,based on the three typical distributions of the heterogeneous reservoir permeability configuration,considering the influence of the pressure gradient function of the lowpermeability reservoir,the permeability configuration is introduced into the activation equation of the pressure gradient function,The optimization algorithm of the permeability parameter is established by using the dynamic data of the production,and the numerical simulation is carried out to verify the calculation.Then,based on the relationship between the seepage curve and the pressure gradient equation of the two-phase seepage flow,the formula of the capacity calculation and the method of optimizing the inversion configuration are deduced.Finally,the calculation of the flow partition is carried out under the condition of different well pattern,and form the numerical calculation method under the whole reservoir.In brief,based on the permeability character of the distribution of low-permeability reservoir and concluded with various method from the individual oil well scale to the well grid system scale and to the full reservoir scale,this thesis is focused on the mathematical permeability feature of heterogeneous reservoir under the low-permeability situation.Thus,the writer has amended the former production formula with the model of permeability in heterogeneous reservoir and constructed a permeability calculation method,based on the feature of non-Darcy flow,which is adequate for low-permeability reservoir and its optimized inversed version.