METHOD OF IMPROVING THE EFFICIENCY OF DEVELOPING LOW-PERMEABLE OIL COLLECTORS Russian patent published in 2019 - IPC E21B43/26 E21B43/18 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to the oil industry and can be applied to the development of low-permeable heterogeneous oil reservoirs horizontal wells with multistage hydraulic fracturing. Method includes drilling horizontal wells with core sampling in the reservoir, conducting laboratory studies of the core, along the horizontal wellbore, depending on the characteristics of the reservoir, conducting interval pumping of chemicals and multi-stage hydraulic fracturing. According to the invention, a reservoir with an average permeability of not more than 1 mD is selected, horizontal wells are performed with a length of at least 1,000 m and are placed in parallel at a distance of 200–600 m, core are selected along the entire length of horizontal wells with a step of 10–50 m, horizontal trunks are cemented using data from laboratory studies of the selected core and geophysical data during drilling, petrophysical, geomechanical and geological-hydrodynamic models are built, on its basis the perforation intervals along the horizontal trunks are determined, the intervals are separated by packers, after a multi-stage hydraulic fracturing, determine the flow of fluids from each interval, the oil productivity of each interval is leveled using chemical reagents to increase or decrease reservoir permeability, after reducing the reservoir pressure in the well extraction zone to 1.0–1.1 from the oil saturation pressure of gas, every second horizontal well is transferred for gas injection.

EFFECT: technical result is to increase oil recovery of low-permeable oil reservoirs.

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