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. 27, 1976
Filed:
Sep. 07, 1973
Applicant:
Inventor:
Armand E Daigle, Maryland Heights, MO (US);
Assignee:
Amoco Production Company, Tulsa, OK (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C09K / ;
U.S. Cl.
CPC ...
252 / ; 252 / ;
Abstract
Aqueous mixtures of fermentation-produced polysaccharides and cellulose derivatives such as hydroxyethylcellulose are used as drilling fluids. They exhibit low viscosity at high shear rates and high viscosity at low shear, causing them to be ideally suited for rapid drilling rates and good cuttings carrying capacity. These fluids are stable in the presence of high calcium ion and salt concentrations and can be used in drilling troublesome shale sections without hydration problems. The addition of KCl in modest amounts improves shale stabilization.