METHOD FOR DETERMINING FILTRATION PROPERTIES OF CAVERNOUS-FRACTURED RESERVOIRS Russian patent published in 2024 - IPC G01N15/08 G01N23/00 

FIELD: mining.

SUBSTANCE: invention relates to means of investigating filtration properties of cavernous-fractured reservoirs. Method comprises performing tomography of a column of full-size core samples of the studied interval of the formation. Volumetric distribution of density in the column is calculated. According to density, zones typical for reservoirs are identified. Cylindrical or cubic samples are cut from the selected zones. For cut samples permeability, relative phase permeability, oil/gas displacement factor, residual water saturation are measured in two or three directions. Volumetric distribution of density in the column of the full-size core sample is used to calculate the distribution of porosity in its volume. Hydrodynamic model of the core column of the studied interval of the formation is created. For this purpose, the volume of the analysed column is divided into cells. In each cell, calculated and measured values of porosity, density, permeability, relative phase permeability, oil/gas displacement coefficient, residual water saturation are set. Created hydrodynamic model is used to simulate the process of oil/gas displacement with water or combined filtration of hydrocarbon fluids and water at their different ratios in the flow and the specified filtration mode. Note here that pressure drop, residual oil/gas saturation, flow rate and viscosity of filtration fluids are recorded. Phase permeability for water and oil/gas in a given direction, as well as coefficients of relative phase permeability for oil/gas and water at different ratios of fluids are calculated, and the coefficient of oil / gas displacement is calculated.

EFFECT: increased reliability and reproducibility of determination of filtration properties of cavernous-fractured reservoirs.

1 cl, 6 dwg, 7 tbl