Flooding with micellar dispersions having connate water...

Details Flooding with micellar dispersions having connate water... Flooding with micellar dispersions having connate water...

E - Fixed Constructions

21

B

166/33

E21B 43/20 (2006.01) C09K 8/584 (2006.01)

Patent

CA 1049926

FLOODING WITH MICELLAR DISPERSIONS HAVING CONNATE WATER COMPATIBILITY ABSTRACT OF THE DISCLOSURE Improved flooding of a subterranean formation con- taining connate water of a particular salinity with a micellar dispersion comprised of surfactant, water, hydro- carbon, cosurfactant and optionally electrolyte is obtained by designing the cosurfactant(s) within the micellar dis- persion to be more hydrophilic with an increase in salinity and also designing the cosurfactant to permit the micellar dispersion to solubilize at most a minimum amount of the connate water. Preferably, the cosurfactant is preselected to impart the desired compatibility of the dispersion with the salinity of the connate water or a cosurfactant can be blended with another cosurfactant to obtain the desired viscosity of the micellar dispersion and desired compati- bility with the connate water. Generally speaking, the cosurfactant should have an increasing hydrophilicy as the salinity of the connate water increases.

254876

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