Oil recovery technique employing non-ionic surfactants

Details Oil recovery technique employing non-ionic surfactants Oil recovery technique employing non-ionic surfactants

E - Fixed Constructions

21

B

E21B 43/16 (2006.01) C09K 8/594 (2006.01)

Patent

CA 2044843

ABSTRACT OF THE DISCLOSURE A method for enhancing the recovery of petroleum from an oil bearing formation during injection of a non-condensible gas comprises the at least periodic injection of a foam forming composition or a preformed foam into the reservoir. The foam which is produced comprises a mixture of a non-condensible gas, water and a non-ionic surfactant. The non-ionic surfactants which can be employed in the present invention are those non-ionic surfactants which have a HLB value of about 14 to less than 20, preferably 15-18, and which provide a stable foam when the surfactant is mixed with brine and/or water and a non-condensible gas. The method is preferably employed within a light oil bearing carbonate formation.

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