METHOD FOR INCREASING OIL RECOVERY OF PRODUCTIVE STRATA OF HYDROCARBON DEPOSITS Russian patent published in 2025 - IPC E21B43/16 E21B43/40 

FIELD: mining.

SUBSTANCE: method of increasing oil recovery includes solidary-synchronous operation of a network of production and absorption wells, saturating pores and microcracks of the underlying massif of rocks with underground waters previously extracted from them by pumping. In the shaft of each oil producing well under the shut-off valves of the mouth there installed is a reversible cumulative head working element of the airlift and atmospheric air compressed with a compressor is supplied to it to create an ascending flow of a three-phase mixture. Shoes of tight casing strings of absorption wells are located below the bottom of oil-bearing strata of rocks. All material lifted to the wellhead is separated by hydrocyclones and/or other known non-volatile auxiliary means into components of liquid, solid and gaseous products, which are then utilized. Spent compressed air is returned back to atmosphere. Oil products are sent to places of their dehydration and storage. Sludge is used to cover the bed of the local road network, and the entire volume of water, raised and thoroughly cleaned from solid fractions, is pumped into absorption wells located on the periphery of the active zone of the depression funnel development, to form a system of closed circulation of underground waters, which washes loose cementing sandy-clay material, grit and fine crushed stone from cavities, pores and microcracks of the massif of underlying rocks, systematically converted into a special redeposited large-detritus avalanche-alluvial technogenic soil with anomalously high open porosity, fracturing and water permeability, which enable different-caliber blocks of the underlying layer of the oil-bearing stratum to freely crumble to the bottom of the incipient lenticular underground lake.

EFFECT: disclosed is a method for increasing oil recovery of productive strata of hydrocarbon deposits.

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