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:
Mar. 31, 1987
Filed:
Jan. 31, 1985
Harold S Chung, Dallas, TX (US);
Krishnaswamy Sampath, Carollton, TX (US);
Frederick C Schwab, Metuchen, NJ (US);
Mobil Oil Corporation, New York, NY (US);
Abstract
The permeability of a subterranean oil-bearing formation is controlled by the injection of an aqueous solution of a block copolymer containing polar and non-polar segments, with the polar segments generally making up at least 50 percent, usually 60 to 99 percent, of the copolymer. The polar segments are derived from an alkylene oxide and the non-polar segments from styrene or an alkyl styrene either by itself or with a diene. The copolymers may be cross-linked with polyvalent metal ions such as chromium and are normally used in solution concentrations of 1000-10,000 ppm. Diene units in the non-polar segment may be hydrogenated to reduce residual unsaturation and solubilizing functional groups such as sulfonate or hydroxyl may be present to improve water solubility.