Patent ID: 9702543
Date: 2017-07-11
CPC Classifications: E21B,F22B

Claim:
1. A method of recovery of oil from a hydrocarbon-containing reservoir using steam, comprising: (a) delivering a fuel and an oxygen-containing gas mixture to a direct combustion steam generator at a pressure exceeding atmospheric pressure, wherein a portion of the oxygen-containing gas mixture is provided by a supply of air delivered to the combustion steam generator; (b) delivering a supply of supplemental oxygen to the combustion steam generator at a delivery pressure exceeding atmospheric pressure, wherein a portion of the oxygen-containing gas mixture is provided by said supplemental oxygen; (c) burning the fuel and the oxygen-containing gas mixture in the direct combustion steam generator to generate an effluent stream comprising combustion products in the form of CO (d) sensing a presence of, or a quantity of, one or more of said combustion products, or a ratio of one of said combustion products to another of said combustion products, in said effluent stream; (e) regulating, via one or more flow regulators, and without said effluent stream being recirculated to said combustion steam generator, a rate of said supplemental oxygen supplied to the combustion steam generator relative to a rate of said air supplied to said combustion steam generator to thereby adjust oxygen content of the oxygen-containing gas mixture so as to produce said effluent stream having a desired composition of one or more of said combustion products in said effluent stream; and (f) injecting the effluent stream into an injection well in said reservoir.