Wells – Processes – Distinct – separate injection and producing wells
Patent
1976-01-05
1978-01-17
Novosad, Stephen J.
Wells
Processes
Distinct, separate injection and producing wells
166263, 166274, 166271, E21B 4324
Patent
active
040687171
ABSTRACT:
A method is provided for recovering heavy oil from an underground tar sand reservoir by injecting steam into an injection well penetrating the reservoir sufficiently to fracture the tar sand and provide passage for the steam through the tar sand to a production well piercing the tar sand reservoir. Steam is provided at sufficient heat to mobilize heavy oil from the permeated tar sand and a pressure sufficient to maintain competency of the formation to permit continued flow from the injection well to the production well. Injection of surfactant into the tar sand reservoir is used to produce a condensible foam which aids in maintaining back pressure on the injected steam within the tar sand reservoir to maintain the competency of the formation and to cause further permeation of the formation by the steam. Foam can be produced of strength sufficient to permit pressure to be applied in the tar sand reservoir capable of further fracturing the reservoir.
REFERENCES:
patent: 2866507 (1958-12-01), Bond et al.
patent: 3280909 (1966-10-01), Closmann et al.
patent: 3330346 (1967-07-01), Jacobs et al.
patent: 3412793 (1968-11-01), Needham
patent: 3464491 (1969-09-01), Froning
patent: 3504745 (1970-04-01), Elkins
patent: 3908762 (1975-09-01), Redford
Novosad Stephen J.
Phillips Petroleum Company
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