| 摘要 |
<p>26619 CORRELATION OF WEIGHTED EFFECT OF DIFFERENT IONS AND SURFACTANT COMPOSITION FOR SURFACTANT FLOOD In the recovery of oil from a formation with an aqueous surfactant solution containing an anionic surfactant such as a petroleum sulfonate, a cosurfactant such as tertiary butyl alcohol, and an electrolyte, a specific surfactant system which is suitable for the given formation, is selected by:(1) analysing the formation brine and determining the total effective Na + concentration, on the basis that each part Ca++ is equivalent to about 14 parts Na+ and each part Mg++ is equivalent to about 16 parts Na+; (2) comparing this total effective Na+ concentration with previously prepared phasevolume diagrams of surfactant systems partitioning into separate phases as a function of electrolyte consentration; and (3) adjusting the electrolyte concentration, hydropbobic content or the surfactant, or solubility of the alcohol to give a particularly effective system for recovering oil.</p> |
