@inproceedings{6dc5dac76bb4413180d2af530818a74f,
title = "The effect of drilling mud damping on vertical vibrations of deep rotary drilling assemblies",
abstract = "We analyse the effect of damping of drilling fluids on vertical vibrations in rotary drilling systems. The vibrations are modelled by an impact oscillator excited by vertical impacts produced by the roughness of the borehole floor. This results in a detachment and bit bounce (chatter). These vibrations are influenced by the presence of the drilling mud in the borehole as it provides viscous damping for the oscillations. We investigate the influence of the rheology of the drilling mud on chatter assuming that the mud is shear-thinning and subsequently non-Newtonian. The Herschel-Bulkley fluid model is used to characterise non-Newtonian drilling muds. It is found that accounting for nonlinear fluid rheology may have significant impact on the value of estimated chatter. In the case of a mud with the Herschel-Bulkley viscosity the chatter can be reduced by increasing the consistency index and the power-law exponent.",
keywords = "Drilling mud rheology, Impact oscillator, Non-Newtonian mud models, Vertical vibrations in borehole drilling",
author = "Agata Guzek and Igor Shufrin and Elena Pasternak and Arcady Dyskin",
year = "2014",
month = nov,
day = "1",
language = "English",
series = "8th Australasian Congress on Applied Mechanics, ACAM 2014, as Part of Engineers Australia Convention 2014",
publisher = "Engineers Australia",
pages = "138--146",
editor = "Raj Das and Sabu John",
booktitle = "8th Australasian Congress on Applied Mechanics, ACAM 2014, as Part of Engineers Australia Convention 2014",
note = "8th Australasian Congress on Applied Mechanics, ACAM 2014, as Part of Engineers Australia Convention 2014 ; Conference date: 25-11-2014 Through 26-11-2014",
}