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:
Mar. 22, 1988
Filed:
Sep. 15, 1986
Applicant:
Inventors:
Karl E Bennett, Hockessin, DE (US);
John L Fitzjohn, Wilmington, DE (US);
Richard A Harmon, Ponca City, OK (US);
Paul C Yates, Jr, Wilmington, DE (US);
Assignees:
Conoco Inc., Ponca City, OK (US);
E. I. Du Pont de Nemours and Company, Wilmington, DE (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
E21B / ;
U.S. Cl.
CPC ...
166292 ; 166275 ;
Abstract
A process for selectively plugging permeable zones in subterranean formations or for plugging subterranean leaks which comprises injecting into the permeable zone or the site of the subterranean leak an aqueous solution containing 1 to 70 weight percent of a non-aggregated colloidal silica sol having a particle size in the range between 4 and 100 nm and a pH in the range between about 1 and 10, and causing said solution to gel in said zone or at said site.