METHOD FOR PREDICTION OF DURATION OF WELL PRESSURE RECOVERY CURVE RECORDING Russian patent published in 2020 - IPC E21B47/06 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to oil and gas industry, namely to methods for prediction of duration of detection of pressure recovery curve (PRC) during primary and current investigations of vertical and subhorizontal wells, which open gas-condensate deposits of low-permeable Achim deposits in conditions of abnormal high reservoir pressure. Method involves recording the gas flow rate and bottomhole pressure during the period of its operation, stopping the well with recording the pressure recovery curve, interpreting the well operation data. Determination of the duration of recording the pressure recovery curve is carried out depending on the type of gas-dynamic analysis complex. Hydrodynamic models of formations and results of gas-dynamic studies of neighboring wells are used in the primary complex of gas-dynamic studies. Duration of well shutdown for recording of pressure recovery curve is determined based on value of effective permeability of porous medium of formation k, at value k less than 1.0 mD duration of well shutdown is set in range from 350 to 400 hours, with value k higher than 4.0 mD duration of well shutdown is set equal to 120 h, at value k within 1.0 mD < k ≤ 4.0 mD duration of well shutdown is established based on mathematical relationship.

EFFECT: technical result is reduction of well downtime and optimization of duration of gas-dynamic studies without loss of information value and accuracy of research results.

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