Wells – Processes – Distinct – separate injection and producing wells
Reexamination Certificate
2005-04-26
2005-04-26
Bagnell, David (Department: 3672)
Wells
Processes
Distinct, separate injection and producing wells
C166S266000, C166S267000, C166S272700, C166S303000
Reexamination Certificate
active
06883607
ABSTRACT:
A process for the recovery of hydrocarbons from a hydrocarbon bearing formation having an extraction chamber where the extraction chamber has an extraction surface. The process has the steps of heating a solvent, such as propane, and then placing the solvent into the extraction chamber at a temperature and a pressure sufficient for the solvent to be in a vapor state in the chamber and to condense on the extraction surface. The next step is to produce a liquid blend of solvent and heavy oil and then to separate the solvent from said heavy oil. Then the solvent is purified, before being re-injected into the formation again. The purification step removes less condensable fractions from the solvent to ensure a purity that is high enough to support continued heat transfer at extraction conditions. The pressure and temperature are set to levels to cause less condensable fractions to drain away with the liquid bitumen and solvent blend that is produced, thus mitigating heat transfer poisoning.
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Nenniger Emil
Nenniger John
Bagnell David
Gay Jennifer H
N-Solv Corporation
Vidas Arrett & Steinkraus P.A.
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