MISCIBLE-TYPE FLOODING OF OIL RESERVOIRS HAVING WATER SATURATED BOTTOM ZONES

摘要

Production of crude oil from an oil-bearing subterranean reservoir having a water zone in fluid communication with and directly below an oil zone is realized by simultaneously injecting about 1-20 percent formation pore volume micellar dispersion in the oil zone and about 0.01-5 percent formation pore volume micellar dispersion in the water zone, followed by a mobility buffer comprising an aqueous polymer solution and drive medium in both zones.