Invert drilling fluid
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United States of America Patent
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Jul 11, 1995
Issued Date -
N/A
app pub date -
Aug 16, 1994
filing date -
Jun 1, 1993
priority date (Note) -
In Force
status (Latency Note)
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Abstract
An environmentally friendly invert drilling fluid comprises a water-in-oil emulsion which includes (a) at least 50 volume percent of a low toxicity base oil, and (b) at least one additive selected from the group consisting of emulsifiers, viscosifiers, weighting agents, oil wetting agents and fluid loss preventing agents, at least about 25 volume percent of the base oil content of the drilling fluid being one or more linear alpha-olefins which have from about 14 to 30 carbon atoms.
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