METHOD FOR HYDRAULIC FRACTURING IN FRACTURED CARBONATE FORMATIONS Russian patent published in 2023 - IPC E21B43/26 

FIELD: oil industry.

SUBSTANCE: invention relates to the field of oil production and can be used in the planning of hydraulic fracturing in carbonate formations characterized by natural fracturing. The method for hydraulic fracturing in carbonate formations characterized by natural fracturing includes conducting a complex of hydrodynamic studies, while before hydraulic fracturing at the well, hydrodynamic studies are carried out by the method for unsteady sampling, followed by removal of the pressure recovery curve or level, according to which the presence of natural fracturing is assessed. When confirming the presence of natural fracturing in the formation, before hydraulic fracturing, at the first stage, the fracturing fluid is injected at a rate of 1.0 - 3.5 m³/min to involve an additional number of natural cracks located in the well drainage zone. At the second stage, the fracturing fluid is pumped at a rate of 2.0 - 3.5 m³/min, already into the cracks formed at the first stage, to create several main cracks; at the final stage, the fracturing fluid is pumped at a rate of 3.0 - 3.5 m³/min to create a hydrodynamic connection between the cracks formed at the first and second stages with voids located in the remote part of the formation.

EFFECT: increase in the efficiency of hydraulic fracturing in carbonate rocks with natural fracturing, and obtaining a greater technological effect: additional oil production.

1 cl, 10 dwg