Fluid compositions
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United States of America Patent
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-
Oct 11, 1988
Issued Date -
N/A
app pub date -
Jun 15, 1987
filing date -
Apr 24, 1984
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Drilling fluid compositions of the invert oil-based type incorporate (i) as the agent for emulsifying the brine phase in the oil phase, a block or graft copolymer of the general formula (A-COO).sub.m B, where A and B represent polymeric components derived from a specified type of oil-soluble complex monocarboxylic acid and from a water-soluble polyalkylene glycol or polyether polyol, respectively, and m is an integer at least 2, and (ii) as the agent for dispersing solid particulate matter in the oil phase a surfactant containing a C.sub.30-500 hydrocarbon chain as hydrophobic component, and a polar component adsorbable on to the particulate solid surface.
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