Method for removing filtercake

Details Method for removing filtercake Method for removing filtercake

1998-08-03

2000-10-17

Neuder, William

Wells

Processes

Chemical inter-reaction of two or more introduced materials

166307, 166312, E21B 3700

Patent

active

06131661&

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 polymer. The filtercake is contacted with a precursor that forms an oxidizing agent at downhole temperatures to degrade the polymers within the filtercake. Alternatively one or more catalysts for activating the precursor of an oxidizing agent is embedded within the filtercake. The catalyst activates the precursor as the precursor is flushed over the filtercake and remains in contact with the filtercake to form an oxidizing agent to degrade the oxidation-degradable agent and decompose the filtercake. The remaining particles of decomposed filtercake are then flushed away.

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