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:
Nov. 07, 2000
Filed:
Dec. 04, 1998
Applicant:
Inventors:
Joseph R Murphey, Spring, TX (US);
Jeffrey S McKennis, The Woodlands, TX (US);
Keith W Sharp, Houston, TX (US);
Assignee:
Tetra Technologies, Inc., The Woodlands, TX (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C09K / ; E21B / ; E21B / ;
U.S. Cl.
CPC ...
507145 ; 507141 ; 507272 ; 507276 ; 507277 ; 166312 ; 166278 ;
Abstract
A method for removing filtercake from a subterranean borehole comprising drilling the borehole with a drilling fluid that includes additives to form a filtercake having an oxidation-degradable component, preferably a polysaccharide. The filtercake is contacted with a clear brine containing bromine or bromate generating agents to degrade the polymers within the filtercake. The brine contains bromide salts and an oxidant capable of delayed oxidation of the bromide to bromine at downhole conditions.