VB Wagle, SS Maghrabi, S Savari, SD Kulkarni - US
Patent 20,130,303,411, 2013
An invert emulsion drilling fluid, and a method of drilling with
such fluid, having improved rheology at low mud weights and high
temperatures. The improved rheology is effected with addition of a
rheology additive of the invention comprising fatty dimer diamines or
dimer diamines and an organic acid or ester of the acid. A nonlimiting
example of such a rheology additive comprises a C36 fatty dimer diamine
and adipic acid or dimethyl adipate.
... These fatty dimer
diamines are prepared commercially from fatty dimer diacids which have been
produced from dimerisation of vegetable oleic acid or talloilfatty
acid by thermal or acid catalyzed methods. The dimerisation ...
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