Abstract
ABSTRACT In this work, the effects of hot-aging on the rheological characteristics of acrylamide-based tetrapolymer modified bentonite drilling mud were examined. The dosage of the acrylamide-co-sodium 2-acrylamido-2-methylpropanesulfonate-co-N-vinyl pyrrolidone-co-N-butyl propenoate (ASAPB) in the drilling muds was varied from 0 to 1 wt.% under geothermal condition ranging from 25°C to 150°C. The rheological behaviour of ASAPB modified bentonite drilling mud were quantified using Vipulanandan model and compared with Herschel-Bulkley model. The Herschel-Bulkley model predicted satisfactorily the shear thinning relationship between the shear stress and shear strain rate. However, Vipulanandan has a maximum shear stress limit whereas the other did not.
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