HIGH SALINITY POLYMER DRIVE FOR SURFACTANT FLOODING SYSTEMS

摘要

HIGH SALINITY POLYMER DRIVE FORSURFACTANT FLOODING SYSTEMSABSTRACT OF THE DISCLOSUREThe invention is a method of recovering hydrocarbonsfrom an underground hydrocarbon formation penetrated by at leastone injection well and at least one production well, in which asaline polymer slug containing about 0.1% to about 3.0% of adrive fluid additive is injected into the formation after theinjection of a saline surfactant slug. The drive fluid additivehas the structure:R(C2H4O)nHy(SO3M)xwhere R is a phenol, an alkylphenol having up to about 4 carbonatoms in the alkyl chain, or the product of reduction of ligninin the presence of carbon monoxide or hydrogen at a temperaturegreater than about 200°C and a pressure greater than about100 psi, n has an average value of about 5 to about 30, x is 0 or1, y is 1 if x is O, y is O if x is 1, and M is an alkali metalor ammonium ion.