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- W3161151732 abstract "Throughout an experimental study it is shown that the axial pressure drop in a 50% eccentric annulus increased with drill string rotation rate for a viscous shear thinning flow at both smaller and intermediate Reynolds and Taylor numbers. This is caused by rotation induced acceleration and deceleration of the fluid flow when the flow is forced to alternating flow in a wide and narrow region of an eccentric annulus. The experiments also demonstrated that at high rotation rates of the drill string the axial pressure drop increased as a result of centrifugal instabilities. The drill string rotation was found to have a significant impact on annular pressure losses. When the axial flow was turbulent the effect of drill string rotation on annular pressure losses was less significant. (orig.)" @default.
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- W3161151732 date "2000-09-01" @default.
- W3161151732 modified "2023-09-27" @default.
- W3161151732 title "Frictional pressure losses during drilling: drill string rotation effects on axial flow of shear thinning fluids in an eccentric annulus" @default.
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