METHOD FOR DETERMINING THE OIL RECOVERY COEFFICIENT FOR AN INHOMOGENEOUS RESERVOIR Russian patent published in 2023 - IPC E21B47/11 E21B49/00 

FIELD: oil production.

SUBSTANCE: invention relates to methods for determining the oil recovery coefficient for heterogeneous formations. The technical result achieved in the implementation of the invention is to provide the possibility of determining the oil recovery factor (ORF) for heterogeneous formations with highly permeable filtration channels. In accordance with the method, continuous water injection is carried out into at least one selected injection well. During the injection process, a single injection of water labeled with an indicator is carried out into the same selected injection well. Within 90-120 days after injection of the water labeled with the indicator, samples of the extracted fluid are taken from the mouth of each of the producing wells surrounding the selected injection well. For each producing well, the concentration of the indicator in the selected sample is determined daily, as well as the water content and flow rate of each producing well. The mass of the indicator is determined in each collected sample and calculate the mass of the indicator that has passed through highly permeable filtration channels during the entire time of sampling. The ORF value is determined by the formula y = 100-1134 / (x-109)², where y is the KIN value, x is the mass of the indicator that passed through highly permeable filtration channels during the entire time of sampling.

EFFECT: present invention enables to calculate oil recovery factor in heterogeneous formations. 2 cl, 3 dwg