Oil recovery process

Details Oil recovery process Oil recovery process

E - Fixed Constructions

21

B

166/31

E21B 43/25 (2006.01) C09K 8/584 (2006.01)

Patent

CA 1202561

OIL RECOVERY PROCESS ABSTRACT OF THE DISCLOSURE A process for recovering oil from an oil-bearing subterranean reservoir penetrated by at least one injection well and at least one production well which comprises the steps of: (1) injecting into the oil-bearing subter- ranean reservoir through the injection well a first injecting fluid consisting essentially of (a) 1% to 30% by weight of an internal olefin sulfonate having 10 to 26 carbon atoms and a disulfonate content of 20% by weight or less, (b) 0.1% to 20% by weight of a cosur- factant, and (c) a brine; (2) injecting, as a second injecting fluid, an aqueous polymer solution having a viscosity higher than that of the first injecting fluid into the oil- bearing subterranean reservoir; and (3) recovering oil replaced with the first and second injecting fluids through the production well. This process can recover oil from subterranean reservoirs at a high oil recovery efficiency without destroying a micro-emulsion during sweeping in the subterranean reservoir even when the salt concentration of the formation water is widely changed.

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