The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 28, 1985
Filed:
Dec. 21, 1983
James M McMillen, Arlington, TX (US);
Mobil Oil Corporation, New York, NY (US);
Abstract
This invention provides a method for recovering heavy crude oil from an underground reservoir penetrated by a well, which comprises (a) heating the reservoir surrounding the wellbore with steam at a temperature below coking temperature but sufficient to increase the temperature 40.degree.-200.degree. F. above the reservoir temperature; (b) producing the formation until most of the injected water is produced; (c) injecting a liquid solvent having a ratio of crude viscosity to solvent viscosity of at least about 10 and in an amount ranging from about 5 to about 25 barrels per foot of oil-bearing formation; (d) producing a solvent-crude mixture; and (e) repeating steps (c) and (d).