METHOD OF OIL RECOVERY FROM OIL-BEARING CARBONATE FORMATIONS Russian patent published in 2000 - IPC

FIELD: oil-and-gas producing industry, particularly, methods of increase of oil recovery from oil wells due to application of physico-chemical methods of stimulation of carbonate formations. SUBSTANCE: method includes treatment of bottom-hole formation zone of oil producing and/or injection well, displacement of oil from reservoir by hydrodynamic pressure of water with subsequent withdrawal of oil from bottom-hole formation zone. Treatment of bottom-hole formation zone of producing and/or injection well is accomplished with highly dispersed water- and acid-repellent hydrophobic material. Then, acid or its solutions are injected through oil producing wells to carbonate oil-bearing formations for dissolving of carbonate compounds and formation of porous structure in oil-bearing formations and subsequent displacement of oil through porous structure from reservoir and its withdrawal from bottom-hole formation zone. EFFECT: restored and improved natural reservoir properties of carbonate formations containing oil in bottom-hole formation zone of producing and/or injection wells. 6 cl, 1 tbl