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:
Apr. 09, 1991
Filed:
Oct. 06, 1989
Applicant:
Inventors:
Robert G Wall, Pinole, CA (US);
Francois Friedmann, Laguna Beach, CA (US);
Steven P Current, Novato, CA (US);
Assignee:
Chevron Research Company, San Francisco, CA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
E21B / ; E21B / ;
U.S. Cl.
CPC ...
166272 ; 166273 ; 166294 ; 166309 ; 252-8554 ;
Abstract
A method of enhanced oil recovery using foam to improve the effectiveness of steam to mobilize viscous crude, either for steam stimulation in a single well or for steam drive between wells. A new surfactant composition having branched alkyl aromatic sulfonates as the effective agent for the steam foamer is used because of its ability to foam in the presence of substantial pore volumes of residual oil and thereby mobilize significant amounts of producible oil by diverting steam to less-permeable zones.