Process for in situ recovery of bitumen and heavy oil

Details Process for in situ recovery of bitumen and heavy oil Process for in situ recovery of bitumen and heavy oil

2005-02-04

2008-12-16

Wright, Giovanna C (Department: 3672)

Wells

Processes

Distinct, separate injection and producing wells

C166S263000, C166S272400, C166S401000

Reexamination Certificate

active

07464756

ABSTRACT:
A process is described for in situ recovery of bitumen or heavy oil from a reservoir having a horizontal injection well and a horizontal production well. The process includes a first phase in which steam and a heavy hydrocarbon solvent are injected into the reservoir, a second phase in which the steam and heavy hydrocarbon injections are transitioned to a light hydrocarbon solvent injection, and a third phase in which a light hydrocarbon solvent is injected without further steam or heavy hydrocarbon injection. A displacement gas may be added during any of the phases, and production of hydrocarbons continues throughout all phases. The process employs a high-production start-up phase, followed by lower cost phases which progress a depletion chamber within the reservoir.

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