METHOD OF DETERMINING DYNAMICS OF EXTRACTION OF HARD TO RECOVER RESERVES OF OIL Russian patent published in 2015 - IPC E21B49/00 

FIELD: oil and gas industry.

SUBSTANCE: invention is designed to calculate the dynamics of oil production in fields with hard to recover reserves (HRR), including as a result of advanced intrusion of oil reserves. The invention comprises standard definitions of reservoir properties of the rock: porosity, permeability, oil saturation and displacement coefficients in the extended range of studies of core samples on the value of differential pressure to 1×10^-4 MPa/m and the linear filtration rate less than 1×10^-3 m/day. According to the research results, the statistical pore, hydrodynamic and energy structure of the borehole rock, the reservoir area, or reservoir as a whole is created, which are taken as the standard object "well-reservoir" (hereinafter W-R) with a field of pressure according to the accepted system of influence on reservoir. The dynamics of oil production is calculated as the product of the total specific yield of mobile stocks in hydrodynamic units of the flow (HUF) of the drainage area W-R at the period of its operation. The specific yield of HUF is calculated by the equation of Poiseuille-Darcy in the radial field of filtration taking into account the nonlinearity and the probability of coincidence of three independent events: permeability, porosity, and shear stress, less than applied in the given range of the pressure gradient.

EFFECT: improved accuracy, reliability, and significant reduction of costs for determining the dynamics of HRR oil extraction, the definition of estimated time and volume of oil extraction at different variants of reservoir stimulation, the choice of the optimal variant of technological and economic efficiency.

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