Oil based drilling fluid
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United States of America Patent
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Sep 14, 2004
Grant Date -
Dec 13, 2001
app pub date -
Jan 26, 2001
filing date -
Aug 2, 1996
priority date (Note) -
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Abstract
Invert emulsion compositions including an oleaginous, a non-oleaginous and an amine surfactant that are useful in the oil and gas well drilling art are disclosed. The amine surfactant is selected so that the invert emulsion can be converted form a water-in-oil type emulsion to a oil-in-water type emulsion upon the protonation of the amine surfactant. Deprotonation of the amine surfactant reverses the conversion.
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