CHROME FREE WATER-BASED WELLBORE FLUID
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United States of America Patent
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Issued Date -
Jul 28, 2011
app pub date -
Oct 13, 2009
filing date -
Oct 13, 2008
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
Methods for maintaining the rheology and reducing the fluid loss of chrome-free, aqueous-based wellbore fluids under high temperature-high pressure conditions are disclosed. The method may comprise formulating the chrome-free, aqueous wellbore fluid with an aqueous base fluid, at least one chrome-free viscosifier, at least one chrome-free fluid loss control additive, at least one chrome-free dispersant; and circulating the chrome-free aqueous-based wellbore fluid in a wellbore at temperatures exceeding 300° F.
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