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:
Jul. 31, 1990
Filed:
Dec. 11, 1989
Roger A Grey, West Chester, PA (US);
Lawrence J Karas, West Chester, PA (US);
Linda A Verkruyse, Plano, TX (US);
Atlantic Richfield Company, Los Angeles, CA (US);
Abstract
A process for recovering crude oil from a subterranean formation comprising injecting into the formation a liquid composition consisting essentially of a specific surfactant in an aqueous medium, driving the liquid composition through said formation to displace oil from said formation and recovering said oil in a production well. The surfactant has the general formula ##STR1## wherein R.sup.1 =C.sub.1 -C.sub.30 alkyl or alkylaryl, R.sup.2 =C.sub.2 H.sub.4 or C.sub.3 H.sub.6, R.sup.3 =C.sub.2 H.sub.4 or C.sub.3 H.sub.6, R.sup.4 =C.sub.1 to C.sub.12 alkyl or alkylaryl, R.sup.5 =H or C.sub.1 -C.sub.12 alkyl or alkylaryl, x and y are integers from 0 to 100, and z is an integer from 1 to 4.