Tetra Technologies, Inc.

Joe Murphey

Jeffrey S McKennis

Mohammad Hossaini

Tom S Carter

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&#xb0; F. to 165&#xb0; F. Concentration of the persulfate sets the pace of the reaction.

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Spring, TX, United States of America

Joe Murphey