1
Ezzat E Gomaa, Roger E Young: Method of improving a steam drive. Chevron Research Company, R L Freeland Jr, Edward J Keeling, November 29, 1977: US04060129 (13 worldwide citation)

A method of improving a steam drive wherein high-quality steam is initially injected into a hydrocarbon-bearing formation to initiate a steam drive from an injection well to a production well and then very low-quality steam or water is injected into the formation until the cumulative value of qualit ...


2
Ezzat E Gomaa: Method of assisting the recovery of oil using steam. Chevron Research Company, R L Freeland Jr, Edward J Keeling, June 6, 1978: US04093027 (3 worldwide citation)

A method of improving hydrocarbon recovery from a hydrocarbon-bearing formation utilizing a steam drive from an injection well to a production well wherein the quality of the injected steam is maintained at a value between 35 and 45% to maximize the heat utilization of the steam.