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:
Oct. 30, 1984
Filed:
Nov. 22, 1982
Applicant:
Inventors:
Mark P Warchol, Houston, TX (US);
Walter W Gale, Houston, TX (US);
Assignee:
Exxon Production Research Co., Houston, TX (US);
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
E21B / ;
U.S. Cl.
CPC ...
166273 ;
Abstract
To reduce the surfactant adsorption in a subterranean formation during a surfactant or microemulsion flooding process, lignosulfonate salts are injected into the formation after the surfactant solution has already been injected. The lignosulfonate afterflush may contain a thickener to promote better sweep efficiency, and water or brine will usually be used to drive the lignosulfonate salts through the reservoir to a production well.