Invert emulsion drilling fluids and muds having negative alkalinity and elastomer compatibility
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United States of America Patent
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Jul 8, 2003
Grant Date -
Jul 26, 2001
app pub date -
Dec 20, 2000
filing date -
Aug 2, 1996
priority date (Note) -
Expired
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Abstract
An invert emulsion suitable for drilling subterranean wells, in particular oil and gas wells is disclosed which has negative alkalinity and includes an oleaginous phase, and a non-oleaginous phase and an emulsifying agent which stabilizes the invert emulsion under conditions of negative alkalinity. The practice of the present invention permits the formulation of drilling fluids which are absent an alkaline reserve and are compatible with elastomers utilized in drilling equipment. Thus the invert emulsion fluids of the present invention are highly suitable for drilling oil and gas wells.
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