Drilling fluid and method for drilling a wellbore
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United States of America Patent
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Jun 6, 2017
Grant Date -
May 23, 2013
app pub date -
Jan 11, 2013
filing date -
Mar 2, 2007
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Abstract
A method for drilling a wellbore into a formation uses a mixed metal-viscosified drilling fluid including at least 1% potassium salt and/or at least 0.05% calcium sulfate; circulating the drilling fluid through the well; and drilling into a formation. An anionic thinner may be added if the clay concentration of the drilling fluid reaches a problematic level to adversely affect pumpability of the fluid.
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