The Fluid-Solid Coupled Flow Mathematic Model of Fractured Horizontal Well

摘要

The fractured reservoir will be caused stress field change, which make rock deformation, porosity and permeability change, and further influence oil production. Based on the equivalent seepage principle and flow field partition principle, it is established non-Darcy seepage flow mathematical model with fluidsolid coupling flow and multi-cracks interference of fractured horizontal well in low permeability reservoirs. This model considers several factors: reservoir rock deformation, stress, porosity and permeability changes, artificial crack, fluid filtration and rock strain coupling, matrix and cracks coupling seepage, non-Darcy flow, etc. Example analysis shows that the model bould study with rock stress and strain, reservoir porosity and permeability change rule with time and space. The oil production predicted with low permeability non-darcy coupling flow model less than that of non-coupling model. The forecast production considering multicracks interference is more close to the practical situation.