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. 23, 1976
Filed:
Mar. 26, 1975
Applicant:
Inventors:
Ying-Chech Chiu, Houston, TX (US);
Harold J Hill, Houston, TX (US);
Assignee:
Shell Oil Company, Houston, TX (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
E21B / ;
U.S. Cl.
CPC ...
1663 / ; 166275 ; 252 / ;
Abstract
The properties of an aqueous surfactant system for displacing oil within a permeable medium are improved by adding an aromatic ether polysulfonate to the system. This improves the tolerance of the system toward salts of monovalent and/or multivalent cations, and also causes emulsions formed between the oil and the oil-displacing system to be less viscous and less stable.