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:
Jan. 01, 1985
Filed:
Dec. 19, 1983
Charles A Euker, Jr, Houston, TX (US);
Exxon Research & Engineering Co., Florham Park, NJ (US);
Abstract
Oil is recovered from oil-bearing rock composed primarily of carbonates by treating the oil-bearing rock with an aqueous solution of an alkali metal compound selected from the group consisting of alkali metal silicates, alkali metal phosphates, and alkali metal borates at a temperature above about 150.degree. F. and then contacting the treated oil-bearing rock with hot water or a hot aqueous solution for a sufficient amount of time to extract the oil from the oil-bearing rock. Normally, the concentration of the alkali metal in the aqueous solution will be above about 0.5 molar and an organic solvent such as toluene, xylene or cyclohexane will be present in the treatment step. The oil-bearing rock will normally be an oil-bearing limestone containing a high viscosity oil which cannot be recovered using conventional hot water extraction techniques.