POLYALKOXY SULPHONATE, CO.SUB.2 AND BRINE DRIVE PROCESS FOR OIL RECOVERY

摘要

POLYALKOXY SULPHONATE, CO2 AND BRINE DRIVE PROCESS FOR OIL RECOVERY Oil is displaced within a subterranean reservoir by injecting a combination of substantially liquefied CO2, brine and surfactant material into the reservoir, with the surfactant material being a polyalkoxy aliphatic sulphonate surfactant material which has specified dispersing and partitioning properties in contact with the brine and the fluids in the reservoir at the reservoir temperate and a pressure sufficient to substantially liquefy the CO2 within the reservoir.