Delayed breaker
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United States of America Patent
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Mar 5, 2013
Grant Date -
Oct 28, 2010
app pub date -
Jul 31, 2008
filing date -
Aug 3, 2007
priority date (Note) -
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Abstract
A process that includes pumping a first wellbore fluid comprising an oxidative degradable polymer into a wellbore through a subterranean formation; pumping a second wellbore fluid comprising a pH-activated oxidative breaker into the wellbore; pumping a third wellbore fluid comprising a delayed acid source into the wellbore; and allowing the delayed acid source to acidify at least a portion of the wellbore to a pH of less than 7 so as to activate the pH-activated oxidative breaker at the lower pH and degrade the oxidative degradable polymers is disclosed.
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