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:
Feb. 17, 1987
Filed:
Apr. 15, 1985
Applicant:
Inventors:
David L Roberts, Rijswijk, NL;
Johan F van Velzen, Rijswijk, NL;
Assignee:
Shell Oil Company, Houston, TX (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
E21B / ;
U.S. Cl.
CPC ...
166303 ; 1663051 ;
Abstract
To prevent dissolution of siliceous grains or siliceous bonds between grains in or around a well when aqueous fluid is passed through the well in an oil recovery process, the siliceous solids are at least once treated with a solution of Co ions in a solvent such as water.