METHOD FOR DETERMINING FRACTURING IN WELL BOTTOM ZONE Russian patent published in 2023 - IPC E21B49/02 G01N15/08 G01N33/24 

FIELD: oil industry.

SUBSTANCE: used in the design and control of wells. A method is claimed for determining the fracturing in the well bottom zone, which includes conducting a set of hydrodynamic studies, sequential analysis of the results of studies in wells, and determining the presence of fracturing. At the same time, core material is selected and the permeability of the core is measured under conditions close to atmospheric. Core samples are loaded stepwise to effective pressure with permeability measured, holding at each step for at least 2 hours. Hydrodynamic studies of wells are carried out at various values of bottom hole pressure. Interpretation of hydrodynamic studies is carried out. Based on the interpretation results, the permeability values near the wellbore are determined, the effective pressure near the wellbore is determined, and the load sensitivity coefficient is calculated from the exponential law to predict permeability when the effective stress changes from laboratory and field data. The load sensitivity coefficients are compared when the effective pressure changes in laboratory and field conditions. When the value of the coefficient of sensitivity to loading, determined from field data, is greater than the coefficient of sensitivity to loading, determined from laboratory tests, more than 50% are diagnosed with the presence of a system of fracturing.

EFFECT: increasing the accuracy of determining the presence of fracturing and the dynamics of the permeability coefficient of development indicators for new objects at the initial stage of development.

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