Title: Recovery of bitumens by imbibition flooding

Abstract: A method for recovering bitumen from tar sand deposits by imbibition flooding at ambient temperature wherein the bitumen is sequentially contacted with a paraffin liquid hydrocarbon followed by a soak period to allow imbibition of the solvent, after which the bitumen and solvent mixture is produced, and the cycle is repeated.

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Inventors: Allen, Joseph C. (Bellaire, TX, US)

Application Number: 578560
Filing Date: 1975-05-19
Publication_date: 1976-09-07
Assignee: Texaco Inc. (New York, NY)
Primary Class(es): 166/267 166/305.1, 299/5
Other Classes:
US Patent Ref:

2288857	Jul, 1942	Subkow	166/272.
2882973	Apr, 1959	Doscher et al.	166/305.
3279538	Oct, 1966	Doscher	166/272.
3349850	Oct, 1967	Schlicht et al.	166/267.
3379247	Apr, 1968	Santourian	166/272.
3386513	Jun, 1968	Holmes	166/267.
3811506	May, 1974	Carlin	166/305.
3881551	May, 1975	Terry et al.	166/272.

Other Refs:
Primary Examiner: Purser, Ernest R.
Assistant Examiner: Ebel, Jack E.
Attorney: Whaley; T. H., Ries; C. G., Bauer; Charles L.