Synthetic paraffinic hydrocarbon drilling fluid
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United States of America Patent
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Oct 29, 1996
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app pub date -
Feb 16, 1995
filing date -
Feb 16, 1995
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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, weighing agents, oil wetting agents and fluid loss preventing agents, at least about 25 weight percent of the base oil content of the drilling fluid being a mixture of a linear alkane combined with a branched chain alkane, the alkanes individually having from about 14 to about 30 carbon atoms.
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