Optimizing the rheological properties of silica nano-modified bentonite mud using overlaid contour plot and estimation of maximum or upper shear stress limit
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Abstract
Description
An optimization based statistical (response surface) approach was used
to evaluate the rheological properties of bentonite mud treated with silica nanoparticles.
The overlaid contour plot established the feasible region for the various factor
settings from multiple regression equations. The steepest method was used to further
determine the optimal factor settings for minimum rheological properties and
this was established at 6.3 wt.% bentonite content and 0.94 wt.% silica nanoparticles.
The rheological properties of the bentonite mud containing and without silica
nanoparticles was evaluated using a Hyperbolic (new) model and related with other
oil industry based models: Herschel Bulkley, Sisko, Casson. The hyperbolic rheological
model estimated the rheological behaviour of the nano-modified mud satisfactorily
while also predicting a shear stress limit for the nano-modified mud. The
maximum shear stress limit values for 6.3, 13 and 15 wt.% mud were 14.59, 61.74
and 107.4 Pa respectively. Upper shear stress values obtained from a 1.5 wt.% silica nanoparticle modified 6.3, 13 and 15 wt.% bentonite mud were 22.27, 72.62 and
171.3 Pa respectively, which represents an increment of 34.5 to 37.4% in the upper
limit of shear stress. The effect of silica nanoparticles on the upper shear stress limit
was quantified using a response surface design
Keywords
T Technology (General), TC Hydraulic engineering. Ocean engineering, TP Chemical technology