Grid Coarsening Of The Influence Of Reservoir Numerical Simulation Research

In the establishment of reservoir geological model in the process, in order to accurately complete containing reservoir characteristics, grid size is fine as possible, leading to the grid number of reservoir geological model often reach millions to tens of millions, but, In reservoir numerical control simulation process, due to the computing power and storage quantity limitation, often require coarse-grained model, grid coarsening will inevitably affect the operational results, but different coarsening method and coarse size how to affect the calculation results, is not clear.Therefore, this article in view of the above problems, carried out the following work:(1) In order to simulate the actual reservoir permeability distribution, analysis of river facies reservoir heterogeneity characteristics, in view of its permeability distribution, build4types of fine geological model.(2) Use of different coarse methods to coarse fine geological models, compared the results.(3) Coarsening fine geological model to different size model, using numeral simulation method to carry on the analysis, comparing the different permeability condition, different rough size cases results in variation of the parameters of the situation.(4) Analysis of results of parameter errors and the different rough size model of the relationship between the curve, determines the error curve inflection point and inflection point corresponding to the mesh size, determine the best coarse size.(5) The theory is applied to the instance, comparative analysis of actual reservoir in different roughening method and coarse size outcome parameters, and analysis of the reservoir and single well production performance.In view of the above research work, obtained the following understanding:(1) In the case of strong permeability heterogeneity, different grid coarsening methods bring different permeability results, and the difference is obvious. result in different numerical simulation result.(2) In the reservoir permeability non-homogeneous reservoirs, permeability mean smaller, grid coarsening of computing the impact is bigger, permeability mean bigger, smaller effect.(3) In permeability anisotropy of reservoir, the error size is controlled by the low penetration of the direction of the mesh size, mesh size is smaller, the error is small, conversely, greater.(4) In the irregular distribution of permeability reservoir, Permeability ratio of the maximum speed value and the minimum wage value affects the error size, The ratio is greater, the more error, conversely, smaller; In the same permeability ratio, minimum value is small, the more error.