The method of increasing oil recovery of fractured, well-permeable, medium-permeable porous formations and formations with artificially created cracks after hydraulic fracturing-hydraulic fracturing

摘要

1. A method of increasing oil recovery in fractured, well-permeable, medium-permeable porous reservoirs and reservoirs with artificially created fractures after hydraulic fracturing — hydraulic fracturing, including injecting an aqueous solution in which 3-10 wt. % of a mixture of bentonite clay powder modified with quartz sand, their ratio is from 10: 1 to a ratio of 1: 2. and containing 0.01-0.30 wt. % partially hydrolyzed polyacrylamide and 0.1-0.6 wt. % crosslinker - chromium-containing compounds, characterized in that they carry out the injection of an aqueous solution in which 5-10 wt. % of a mixture of bentonite clay powder modified with quartz sand, their ratio is from 10: 1 to a ratio of 1: 2, 1-10 wt.% dry sodium silicate and containing 0.01-0.30 wt. % partially hydrolyzed polyacrylamide and 0.01-0.60 wt. % fixative - chlorine-containing compounds. 2. A method of increasing oil recovery in fractured, well-permeable, medium-permeable porous formations and formations with artificially created cracks after hydraulic fracturing of a hydraulic fracturing formation according to claim 1, characterized in that they inject an aqueous solution in which 0.5-10 wt. % of a modified bentonite clay powder mixture, 0.5-10 wt.% dry sodium silicate and containing 0.01-0.30 wt. % partially hydrolyzed polyacrylamide and 0.1-0.6 wt. % fixative - chlorine-containing compounds. 3. A method of increasing oil recovery in fractured, well-permeable, medium-permeable porous formations and formations with artificially created cracks after hydraulic fracturing of a hydraulic fracturing formation according to claim 2, characterized in that they inject an aqueous solution in which 1-10 wt. % mixture of bentonite clay powder, 1