Method for oil recovery from reservoir rock formations

Details Method for oil recovery from reservoir rock formations Method for oil recovery from reservoir rock formations

E - Fixed Constructions

21

B

166/33

E21B 43/12 (2006.01) C09K 8/584 (2006.01)

Patent

CA 1209465

ABSTRACT A process is disclosed for the tenside flooding of reservoirs of medium and high salinities, wherein an emulsion of an oil phase, an aqueous phase, and carboxymethylated oxethylate is introduced by flooding before and/ or after a solution or dispersion of carboxymethylated oxethylate, the tenside and/or the emulsifier being selected so that the phase inversion temperature of the system of reservoir oil/flooding water/tenside/optionally additives, or reservoir oil/flooding water/emulsifier/optionally additives, respectively, lies about 0° to 10°C above the reservoir temperature. This method reduces tenside retention as compared with the state of the art.

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