Method for removing filtercake
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United States of America Patent
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Nov 7, 2000
Grant Date -
N/A
app pub date -
Dec 4, 1998
filing date -
Aug 3, 1998
priority date (Note) -
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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.
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