Fast drilling invert emulsion drilling fluids
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United States of America Patent
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-
Apr 2, 1985
Grant Date -
N/A
app pub date -
May 19, 1983
filing date -
May 19, 1983
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Disclosed are invert oil emulsion drilling fluids containing a non-toxic, biodegradable oil having a viscosity at 25.degree. C. of less than 1.5 centipoise, a flash point of at least 60.degree. C., an aniline point of at least 80.degree. C., and a content of aromatic hydrocarbons of less than 1% by volume. These drilling fluids have a low viscosity at the high shear rates imparted to a drilling fluid at the bit during drilling. This low bit viscosity provides for faster penetration rates. Such drilling fluids containing a temperature stabilizing additive exhibit superior thermal stability.
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