Oil recovery by surfactant waterflooding

Details Oil recovery by surfactant waterflooding Oil recovery by surfactant waterflooding

E - Fixed Constructions

21

B

166/31

E21B 43/22 (2006.01) C09K 8/584 (2006.01) C09K 8/88 (2006.01)

Patent

CA 1054926

OIL RECOVERY BY SURFACTANT WATERFLOODING Abstract of the Disclosure A surfactant waterflooding process for the recovery of oil from subterranean oil reservoirs in which a water-soluble polyalkylene oxide is employed as a sacrificial agent in order to retard adsorption of the surfactant. An aqueous pretreatment slug is injected which contains a water-soluble polyalkylene oxide sacrificial agent having a molecular weight of at least 1200. Thereafter an aqueous slug containing a surfactant exhibiting a lower molecular weight than that of the polyalkylene oxide sacrificial agent is injected. The surfactant slug may also contain a polyalkylene oxide sacrificial agent as described above. In this case, concentration of sacrificial agent in the surfactant slug normally is lower than the concentration in the pretreatment slug. -1-

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