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. 23, 1991
Filed:
Apr. 10, 1989
Applicant:
Inventors:
Roy F House, Houston, TX (US);
Lonnie D Hoover, Chappell Hill, TX (US);
Assignee:
Baroid Technology, Inc., Houston, TX (US);
Primary Examiner:
Int. Cl.
CPC ...
E21B / ;
U.S. Cl.
CPC ...
252-8551 ; 2523635 ;
Abstract
Disclosed are heavy brine compositions containing zinc bromide and one or more soluble salts selected from the group consisting of calcium chloride and calcium bromide, preferably having a density in the range from about 14.2 to about 16.0 pounds per gallon, which have a low API fluid loss. Also disclosed is a method of formulating certain heavy brines in which hydroxyethyl cellulose functions as a fluid loss additive.