Methods and solutions for removing HEC-based CFLA from a subterranean formation
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United States of America Patent
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May 12, 2009
Grant Date -
May 27, 2004
app pub date -
Nov 26, 2002
filing date -
Nov 26, 2002
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The current invention provides a novel downhole maleic acid solution suitable for restoring fluid permeability to subterranean formations that were previously treated with chemical fluid loss control agents based on hydroxyethyl cellulose polymer. The current invention also provides methods for restoring fluid permeability to subterranean formations that have been treated with chemical fluid loss control agents based on hydroxyethyl cellulose polymer. The methods of the current invention contact the subterranean formation with downhole maleic acid solutions for a period of time sufficient to restore fluid permeability to the formation.
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