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:
Jul. 27, 1982
Filed:
Jan. 16, 1981
Applicant:
Inventors:
Steven R Blattel, Houston, TX (US);
Larry W Hilscher, Houston, TX (US);
Assignee:
NL Industries, Inc., New York, NY (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C09K / ;
U.S. Cl.
CPC ...
252 / ; 252 / ;
Abstract
Aqueous, clay-containing drilling fluids and packer fluids are modified for reduction of viscosity and gel strength upon addition of water soluble lignosulfonates and particular low molecular weight acrylic copolymers. Enhanced reduction of viscosity and gel strength may be obtained by also adding an ethoxylated phenol surfactant.