Miscible-type recovery process using foam as a mobility buffer

摘要: Crude oil is recovered from a subterranean oil-bearing formation having injection means in fluid communication with production by injecting into the 1-20 percent pore volume of micellar dispersion (contains hydrocarbon, surfactant, and aqueous medium) followed 10-100 or more foam. Drive water can be injected to displace foam toward recover crude oil. The have mobility about equal less than that dispersion. Also, liquid buffer slug precede follow