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Invert Emulsion Drilling Fluids for Flat Rheology Drilling

Monday, December 9, 2013  
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VB Wagle, SS Maghrabi, DG Kulkarni - US Patent 20,130,303,410, 2013

Abstract:

An invert emulsion drilling fluid, and a method of drilling with such fluid, having substantially flat or relatively controlled rheology, as demonstrated by the drilling fluid exhibiting little change in its yield point and gel strength across a temperature range of from about 40° F. to about 180° F., and effected with addition of a fatty dimer diamine additive together with an acid and without the addition of organophilic clays or lignites.

 

... 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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