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. 16, 1978
Filed:
Jun. 25, 1976
Edward F McCarthy, Naperville, IL (US);
Standard Oil Company (Indiana), Chicago, IL (US);
Abstract
A method for increasing the tolerance of hydrocarbon polymer sulfonate surfactant materials to divalent ions especially calcium when such materials are injected into subterranean formations containing high divalent cation contents which comprises contacting the hydrocarbon polymer sulfonate surfactant with an oxidizing agent at oxidizing conditions. The specific hydrocarbon polymer sulfonate surfactants disclosed are those produced from lower aliphatic olefins such as isobutylene, butene-1, butene-2 or propylene or other similar olefinic materials which have been polymerized to average equivalent molecular weights of from about 350 to 675 or higher. The preferred oxidizing agent is hydrogen peroxide.