METHOD FOR HYDRAULIC FRACTURING OF AN OIL-SATURATED CARBONATE FORMATION Russian patent published in 2023 - IPC E21B43/26 

FIELD: oil production.

SUBSTANCE: invention relates to methods for intensifying oil production from carbonate reservoirs by performing acid fracturing and can be used to increase the flow of oil to wells operating high-water cut carbonate reservoirs. The method for performing acid hydraulic fracturing includes lowering a string of injection pipes into the zone of hydraulic fracturing of a productive formation, sealing the annular space with a packer, pumping a self-diverting acid composition as a fracturing fluid under pressure through the injection string. In this case, a vibratory unit of a hydraulic principle of operation is preliminarily mounted in the lower part of the injection pipe string, the process of pumping a self-diverting acid composition to create a hydraulic fracturing is carried out through an existing vibratory unit. The technical result is a significant increase in the permeability of the bottomhole formation zone and the interwell space and, as a result, an increase in the current oil production and an increase in the final oil recovery of the carbonate formation, due to the creation of multiple secondary fractures, into which the self-diverting acid composition penetrates at high speed, due to reduced viscosity.

EFFECT: significant increase in the permeability of the bottomhole formation zone and the interwell space, increase in the current oil production and final oil recovery of the carbonate formation

1 cl, 1 dwg