SYSTEM, MACHINE-READABLE CARRIER, AND METHOD FOR COMPUTER PROCESSING OF DATA OF CCE-TEST OF RESERVOIR OIL OF “BLACK OIL” TYPE Russian patent published in 2023 - IPC G01V99/00 E21B47/06 G06F30/23 

FIELD: data processing.

SUBSTANCE: invention relates to the study and computer processing of data of reservoir hydrocarbon fluids with expressed signs of vapor phase formation. A method for computer processing of data of CCE-test of reservoir oil of a “black oil” type is proposed, which includes following steps: data is obtained, including at least arrays of single-phase and two-phase areas of experimental PV isotherms; correctness of data is assessed, and experimental data is smoothed by building a polynomial curve approximating data, wherein data correctness assessment includes at least following checks: the absence of extremes and inflections on a graph of the approximating function, non-convexity of the graph of the approximating function, excess of an approximation accuracy coefficient of a given critical value of non-exceeding maximum discrepancies between calculated values and permissible values determined experimentally; in case of data incorrectness, unreliable points are excluded, and correctness of data is repeatedly assessed as described in the previous step; a degree of polynomial of the curve approximating PV isotherm in the single-phase area of fluid existence is selected and justified; PV isotherms are recalculated (corrected) to account for a dead volume of PVT cell during CCE-test at several temperatures; pressure of oil saturation with gas is determined using analysis of Y-factor behavior and isotherm curvature; final equations of polynomials describing PV isotherm in single-phase and two-phase areas are obtained, taking into account a saturation pressure point; calculation/determination and justification of a dependence of fluid density on pressure are carried out; a report is generated. In some embodiments, the technical solution can be implemented in the form of a system including at least a processor, RAM, and machine-readable instructions, made with the possibility of loading and execution of machine-readable instructions to implement above-described steps/stages/actions of the method. In some embodiments, the technical solution can be implemented in the form of a machine-readable carrier containing above-described instructions.

EFFECT: increase in the accuracy, effective processing for a two-phase area of isotherm outside the experimental range, determination of saturation pressure of fluids, which do not have an obvious inflection in an area near saturation pressure.

8 cl, 4 dwg