Varying temperature oil recovery method

Wells – Processes – Distinct – separate injection and producing wells

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166274, E21B 4324

Patent

active

044651376

ABSTRACT:
The present invention is a sequenced method of increasing the injectivity of oil bearing formations and increasing hydrocarbon recovery. The method of the invention is initiated by injecting an aqueous fluid at an ambient temperature into the formation through an injection well while concurrently recovering fluid at a production well. The first injection stage is followed by the injection of fluid of gradually increasing temperature until a temperature of about 75.degree.-100.degree. C. is reached. Finally, steam is injected into the formation.

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Synthetic Fuels, "Status of Technology for the In-Situ Recovery of Bitumen From Oil Sands", 3/74, p. 3-1.

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