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:
May. 03, 2005
Filed:
Aug. 28, 2002
Mohammad Hossaini, Houston, TX (US);
Joe Murphey, Spring, TX (US);
Tom S. Carter, Houston, TX (US);
Jeffrey S. Mckennis, The Woodlands, TX (US);
Mohammad Hossaini, Houston, TX (US);
Joe Murphey, Spring, TX (US);
Tom S. Carter, Houston, TX (US);
Jeffrey S. McKennis, The Woodlands, TX (US);
Tetra Technologies, Inc., Woodlands, TX (US);
Abstract
A method for removing filter cake from a subterranean borehole comprising drilling the borehole with a drilling fluid that includes additives to form a filter cake having an oxidation-degradable component, preferably a polysaccharide. The filter cake is contacted with a clear brine containing a mixture of a persulfate salt in a variable density brine to degrade the polymers within the filter cake. The persulfate mixture breaks down the filter cake in well bores having temperatures ranging from about 65° F. to 165° F. Concentration of the persulfate sets the pace of the reaction.