Invert emulsion drilling fluid and process
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United States of America Patent
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N/A
Issued Date -
May 15, 2003
app pub date -
Oct 9, 2002
filing date -
Oct 11, 2001
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
An invert emulsion, in which the aqueous phase includes a low concentration of potassium formate, is used in well drilling. The low concentration of potassium formate may be maintained by monitoring the potassium level in the circulating drilling fluid and/or by intermittently measuring the water activity of the drilling fluid. As an emulsifier, a reaction product of tall oil and a fatty alkanolamide may be used, optionally with an additional reaction product of tall oil with an aminoethylpiperazine.
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