METHOD FOR INCREASE OF OIL RECOVERY OF CRACKED AND POROUS BEDS WITH ARTIFICIALLY CREATED CRACKS AFTER HYDRAULIC BED RUPTURE - HBR

摘要

FIELD: oil and gas production.;SUBSTANCE: invention relates to oil industry and may be used for waterflooding of cracked and porous beds, non-uniform in permeability, with artificially created cracks after HBR. In method for increase of oil recovery from cracked and porous beds with artificially created cracks after hydraulic bed rupture - HBR, including pumping aqueous solution of polyacrylamide with crosslinker - chrome compound, using additive of bentonite clay powder and quartz sand, modified bentonite clay powder is used, as well as in mixture with quartz sand, at first aqueous solution is pumped, containing 0.01-0.30 wt % of partially hydrolyzed polyacrylamide and 0.1-0.6 wt % of crosslinker - chrome-containing compound, driving with water, then pumping of aqueous solution of polyacrylamide with viscosity that is 10% more than viscosity of formation water, where 3-10 wt % of modified bentonite clay powder and quartz sand mixture is suspended with their initial ratio of 10:1 with further increase of sand concentration up to ratio of 1:2.;EFFECT: improved oil recovery.