METHOD FOR OIL PRODUCTION IN CLAY-BEARING RESERVOIRS WITH MONTMORILLONITE COMPOUNDS Russian patent published in 2023 - IPC E21B43/24 E21B43/26 

FIELD: oil production.

SUBSTANCE: in clay-containing oil-saturated reservoirs with montmorillonite compounds, the current formation pressure is determined, a clay sample is taken, the temperature of the start of crystal chemical transformation of clays is determined on the selected clay sample of the oil-saturated reservoir. The bottom hole zone of the well is heated and secondary fracturing is formed by pumping the calculated volume of anhydrous gaseous coolant - the combustion product of organic fuel with air or an inert gas - at a temperature below the temperature of crystal chemical transformation of clays and a pressure equal to the minimum hydraulic fracturing pressure, forming secondary fracturing. Then the well is shut for the time of pressure drop to the current reservoir pressure, then the oil is produced.

EFFECT: increase in oil production by enhancing the coverage of the reservoir with a coolant, maintaining the structure and shape of the pore channels, restoring and increasing its natural permeability.

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