Surfactant composition

摘要

The invention provides a synergistic surfactant composition comprising: (a) a first amphoteric surfactant, which is selected from C8-C22 sultaines, salts thereof, and mixtures thereof; and (b) a second amphoteric surfactant, which is selected from C8-C22 betaines and salts thereof, C8-C22 propionates and salts thereof, and mixtures thereof. This surfactant composition may be used to generate foam that is used for unloading a liquid from a hydrocarbon reservoir. It may be that the liquid unloading of foam generated using the surfactant composition is greater than that of foam generated from the first and second surfactants when they are foamed individually.

主权项

1. A method of unloading liquid from a reservoir, the method comprising: introducing two amphoteric surfactants into the liquid, in order to foam the liquid; and then removing foamed liquid from the reservoir;
wherein the first amphoteric surfactant is selected from the group consisting of C8-C22 sultaines, salts thereof and mixtures thereof; and the second amphoteric surfactant is selected from the group consisting of C8-C22 betaines and salts thereof, C8-C22 propionates and salts thereof, and mixtures thereof.