Methods for using reversible phase oil-based drilling fluid
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United States of America Patent
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May 27, 2008
Grant Date -
May 17, 2007
app pub date -
Jan 10, 2007
filing date -
Aug 2, 1996
priority date (Note) -
Expired
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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. This solution also permits the conversion of oil-wet solids in the fluid into water-wet solids.
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