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:
Aug. 01, 1989
Filed:
Jul. 06, 1988
Applicant:
Inventor:
John K Borchardt, Houston, TX (US);
Assignee:
Shell Oil Company, Houston, TX (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
E21B / ; E21B / ;
U.S. Cl.
CPC ...
166272 ; 166274 ; 166303 ; 252-8554 ;
Abstract
An improvement to a steam foam enhanced oil recovery process, whereby the time between injection of a surfactant and the resulting increase in steam injection pressure is reduced by initially injecting a rapidly-foaming surfactant, such as an internal olefin sulfonate, a vinylidene olefin sulfonate, or secondary alkane sulfonate, and subsequently injecting a typical steam foam surfactant that forms foam less rapidly.