LIQUID FILTRATION IN ANOMALOUS COLLECTORS

The relevance of the research is caused by the need of development of Jurassic and Achimov reservoirs with low filtration properties and viscoplastic oil deposits. Classic Darcy law can not be applied to these reservoirs. So to predict development indicators and to calculate well production potential the filtration and oil displacement features should be considered. The main aim of the research is to find the relation between Lagrange parameter and initial pressure gradient, to identify values of Lagrange parameter when Darcy law can not be applied. The aim of the research is to explain as well the hydrodynamic modeling methods (developed for liquid filtration) application to research of fluid flow in anomalous reservoirs. Objects: high-permeability reservoirs with high-viscosity (viscoplastic) oil; low-permeability Jurassic and Achim layers. Methods: interpretation of laboratory core researches; physical modeling of fluid filtration in anomalous reservoirs. Results. The deviation from Darcy law for liquid filtration in anomalous reservoirs is defined by Lagrange parameter calculation. Method of determination of lower limit of Darcy Law applicability is proposed. For the case of Darcy Law violation two models are proposed: with initial pressure gradient and nonlinear model. Nonlinear model is considered for the case of upper limit of Darcy law vialation. Lagrange parameter calculation examples are considered for upper and lower limits of Darcy's Law vialation. It is proposed to use system of piezoconductivity equations instead of nonlinear equations for dilatant and pseudoplastic fluids filtration. It is shown that methods for solving hydrodynamic filtration and oil displacement problems are applicable to both viscoplastic oils and low-permeability reservoirs.