INVERT DRILLING FLUIDS
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United States of America Patent
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Issued Date -
Jul 3, 2014
app pub date -
Mar 21, 2012
filing date -
Mar 21, 2011
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Abandoned
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Abstract
There is described an invert emulsion wellbore fluid that includes: an oleaginous external phase; a non-oleaginous internal phase, wherein a ratio of the oleaginous external phase and non-oleaginous internal phase is less than 50:50 by volume; an emulsifier; and a rheological additive comprising a sulphonated polymer formed from 100 to 10,000 monomers. There is also described a method of drilling a subterranean hole using the invert emulsion drilling fluid.
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