METHOD FOR DETERMINING THE COEFFICIENT OF OIL DISPLACEMENT OF THE BASHKIR CARBONATE DEPOSITS OF THE SOLIKAMSK DEPRESSION Russian patent published in 2018 - IPC G01N15/08 E21B43/20 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to the field of petroleum geology and can be used in calculating recoverable oil reserves from rocks represented by the Bashkir carbonate sediments of the Solikamsk depression. Essence: from the core of the real rock of the Bashkir carbonate deposits of the Solikamsk depression, standard cylindrical samples are made. Samples are extracted from the oil, dried until the mass is stabilized, weighed in dry condition. Porosity coefficient, the gas permeability coefficient and the oil viscosity are determined. Under vacuum, 100 % saturation of the sample with formation water or its model is carried out. Saturated sample is weighed in the air. Using capillary measurements, water is displaced from the samples to the value of the residual water saturation. Coefficient of residual water saturation is determined. In this case, after 100 % saturation of the sample with water under vacuum, it is additionally weighed in water, then the bulk density of the rock from which the sample is made is determined. Discriminant function of the sample is calculated by the method of discriminant analysis. According to the discriminant function, the rock grade is determined (I or II) from which the sample is made. Oil displacement coefficient is calculated with respect to the rock grade.

EFFECT: increase in the accuracy of determining the coefficient of displacement of oil by water for the Bashkir carbonate deposits of the Solikamsk depression.

1 cl, 2 dwg