Functionalized clay compositions for aqueous based drilling fluids
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United States of America Patent
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Aug 2, 2011
Grant Date -
Mar 20, 2008
app pub date -
Sep 14, 2006
filing date -
Sep 14, 2006
priority date (Note) -
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Abstract
An aqueous drilling fluid which contains a diquaternary ammonium cation functionalized clay which provides a substantially constant rheological profile, with respect to salinity, when incorporated into well drilling fluids. A clay/organic chemical composition includes: (a) montmorillonite clay and (b) one or more diquaternary ammonium compounds. A further aspect of the invention is a well drilling process which employs a drilling fluid containing the diquaternary ammonium cation functionalized clay described hereafter.
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