Abstract

Abstract Combinations of drill string motion, annular eccentricities and fluid temperatures along the length of the annulus affect fluid flow regimes that control annular pressure losses. In a research well with conventional annular configuration, increases in annular pressure losses were observed to follow increasing drill string rotation. Drill string rotation can result in the formation of centrifugal instabilities that can increase annular pressure losses before the transition to turbulent fluid flow. These instabilities partially take the form of Taylor vortices which lead to irregular fluid flow. Rapid and cyclic changes in rotation rates can lead to synchronous changes in down hole pressures.

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