Method for removing filtercake

Details Method for removing filtercake Method for removing filtercake

1998-12-04

2000-11-07

Tucker, Philip

Earth boring, well treating, and oil field chemistry

Earth boring

Contains inorganic component other than water or clay

507141, 507272, 507276, 507277, 166312, 166278, C09K 702, E21B 2100, E21B 4304

Patent

active

061436984

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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