METHOD (VARIANTS), SYSTEM AND MACHINE-READABLE MEDIUM FOR DETERMINING THE PROPORTION OF RESERVOIR FLUID IN A FLUID MIXTURE Russian patent published in 2022 - IPC E21B47/00 E21B47/10 E21B49/08 

FIELD: oil and gas industry.

SUBSTANCE: group of inventions relates to the oil and gas industry and can be used for separate accounting of products during joint operation of several reservoirs. To implement a method for determining the proportion of reservoir fluid in a mixture of fluids, at least one sample of individual reservoir fluid is obtained from at least two different layers. Calibration mixtures are prepared by mixing individual reservoir fluids of different layers in different ratios. The hydrocarbon composition of the obtained calibration mixtures is determined. Correlations are established between the content of individual reservoir fluids in calibration mixtures and the obtained data on the hydrocarbon composition of calibration mixtures using the multidimensional regression method. A sample of the studied fluid is obtained and its hydrocarbon composition is determined. The proportions of each individual reservoir fluid are determined based on the data obtained on the hydrocarbon composition of the sample of the fluid under study and on the established relationship between the content of individual fluids in calibration mixtures and the hydrocarbon composition of calibration mixtures. According to the second option, at least three samples of individual reservoir fluid are obtained. A system and a machine-readable carrier for determining the proportion of reservoir fluid in a fluid mixture is proposed.

EFFECT: increase in the accuracy of determining the content of the fraction of each reservoir fluid in a mixture of two or more fluids, as well as an increase in the reliability of the distinguishability of hydrocarbon fluids in a mixture that belong to different formations/deposits.

51 cl, 11 dwg, 6 tbl