VELOCITY DISTRIBUTION IN PIPE CROSS-SECTION UNDER LAMINAR FLOW CONDITIONS
Keywords:
drilling fluid, velocity profile, laminar flow, Reynolds number, annular flow, pressure losses, hydraulic efficiency, cuttings transport.Abstract
This article explores the formation and importance of velocity profiles
in drilling-fluid circulation as a key factor affecting hydraulic efficiency, pressure
losses, and cuttings transport during drilling operations. Focus is given to the
development of laminar and transitional flow regimes within the drill pipe and annular
space, the impacts of viscosity and density, and the evolution of the flow profile near
the bit entry. The analysis emphasises how velocity distribution influences the
predictability of pressure gradients, the stability of cuttings suspension, and the risk of
turbulence-induced erosion. Understanding these hydrodynamic principles allows
drilling engineers to optimise pump performance, maintain safe flow regimes, and
prevent sedimentation. The findings demonstrate that velocity-profile analysis
provides a critical foundation for enhancing drilling efficiency, borehole stability, and
overall operational safety.
References
1.
Bird, R. B., Stewart, W. E., & Lightfoot, E. N. (2007). Transport phenomena
(2nd ed.). John Wiley & Sons.
2.
Bourgoyne, A. T., Millheim, K. K., Chenevert, M. E., & Young, F. S. (1991).
Applied drilling engineering. Society of Petroleum Engineers.
