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Methods and Materials to Enhance High Temperature Rheology in Invert Emulsions

Monday, December 9, 2013  
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 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 tall oil fatty acid by thermal or acid catalyzed methods. The dimerisation ...

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