Method for using reversible phase oil-based drilling fluid
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United States of America Patent
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Feb 20, 2007
Grant Date -
Dec 23, 2004
app pub date -
Jul 13, 2004
filing date -
Aug 2, 1996
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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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