METHOD OF INVESTIGATION OF LOW-PERMEABLE RESERVOIRS WITH MINIMUM LOSSES IN PRODUCTION Russian patent published in 2018 - IPC E21B49/00 E21B47/06 G06G7/48 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to the oil industry and can be used to determine the filtration-capacitive properties of low-permeability formations. Method includes recording the production rate and the bottomhole pressure of the well during a long period of well operation, stopping the well with recording the pressure recovery curve, interpretation of the well life data, production/pressure analysis prior to obtaining the best alignment, and interpretation of the pressure recovery curve. Herewith the interpretation of the pressure recovery curve and the production/pressure analysis are performed together and cyclically to obtain the best alignment of the pressure recovery curve in the stopped well, the production/pressure drop curve of the well operation period with their theoretical curves, wherein the pressure recovery curve is "not tracked", the interpretation of the "not tracked" pressure recovery curve is made by varying all parameters determined at the early and middle times and the reservoir pressure, and the permeability value varies in a narrow range over the first production/pressure analysis cycle, in turn, the production analysis is performed with parameters varied in the narrow range determined at the early and middle times as per the interpretation of the "not tracked" pressure recovery curve and the variation of the permeability and the reservoir pressure.

EFFECT: technical result of the invention is to increase the effectiveness of well research methods, as well as to reduce the production losses during well testing using the pressure recovery curve method.

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