An improved estimation of shear rate using rotating coaxial-cylinder Fann viscometer: A rheological study of bentonite and fly ash suspensions

Bentonite is commonly used as a drilling fluid additive for viscosity control during drilling of oil wells. Rheological behavior of bentonite suspensions is very complex and it is very difficult to predict accurate shear rates from viscometer readings. This paper deals with the accurate estimation o...

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Bibliographic Details
Published in:International journal of mineral processing 2014-01, Vol.126, p.18-29
Main Authors: Kumar, Rajesh, Kumar, Vineet, Rajak, Dilip K., Guria, Chandan
Format: Article
Language:English
Subjects:
Bentonite
Drilling fluids
Fly ash
Mathematical analysis
Rheological properties
Rotating
Rotational viscometer
Shear rate
Suspension rheology
Viscometers
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Summary:Bentonite is commonly used as a drilling fluid additive for viscosity control during drilling of oil wells. Rheological behavior of bentonite suspensions is very complex and it is very difficult to predict accurate shear rates from viscometer readings. This paper deals with the accurate estimation of shear rates of bentonite suspensions using rotating coaxial-cylinder Fann viscometer readings. Rotor rotations and bob deflections are the two important Fann viscometer readings which are used to predict shear rates with the help of generalized viscometer difference equation. Rheological behavior of bentonite suspensions are also compared with classified fly ash suspensions with varying particle size and solid loading. The proposed shear rate equation is quite general and can be applied to any fluid. •Rotational coaxial cylinder-viscometer•Improved shear rate estimation•Rheology•Bentonite suspensions•Fly ash suspensions
ISSN:0301-7516
1879-3525
DOI:10.1016/j.minpro.2013.11.004