Method of microbially assisted water alternating gas injection as a means of enhanced oil recovery by supplementing the immiscible water injection cycle with nutrients to improve oil release in oil-containing rock formations

摘要

A method for enhancing oil and oil residue recovery from oil-containing rock formations by supplementing a water cycle of a water alternate gas process with nutrients such that the formation resident microorganisms are stimulated as an additional oil release mechanism is provided. The method alters three-phase relative permeability in order to increase displacement efficiency while increasing oil release by microbially assisted water alternate gas processing.