Title: Method for recovery of bitumens from tar sands

Abstract: A method for the recovery of low gravity viscous oils or bitumens from a subterranean formation by the injection of a mixture of an oxygen-containing gas and steam to establish a hot communications path, followed by a shutting in of the wells for a period to allow the oxygen to react with the oil or bitumen in the formation and thereafter recovering the oil or bitumens via the production well. The cycle may thereafter be repeated.

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Inventors: Redford, David A. (Fort Saskatchewan, CA, US)

Application Number: 481582
Filing Date: 1974-06-21
Publication_date: 1976-09-07
Assignee: Texaco Exploration Canada Ltd. (Calgary, CA)
Primary Class(es): 166/261 166/401
Other Classes:
US Patent Ref:

2839141	Jun, 1958	Walter	166/261.
3209825	Oct, 1965	Alexander et al.	166/261.
3292702	Dec, 1966	Boberg	166/303.
3375870	Apr, 1968	Satter et al.	166/259.
3400762	Sep, 1968	Peacock et al.	166/259.
3409077	Nov, 1968	Durie	166/256.
3411575	Nov, 1968	Connally	166/259.
3411578	Nov, 1968	Holmes	166/256.
3500913	Mar, 1970	Nordgren et al.	166/259.
3605890	Sep, 1971	Holm	166/272.
3680634	Aug, 1972	Peacock et al.	166/261.

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