Invert Emulsion Drilling Fluids for Flat Rheology Drilling
Monday, December 9, 2013
VB Wagle, SS Maghrabi, DG Kulkarni - US Patent
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 ...