Abstract
Summary This paper presents experimental results of the effects of coiled-tubing curvature on the drag-reduction behavior of polymeric fluids in turbulent flow. The experimental setup consists of a 10-ft section of ½-in. outside diameter (OD) straight tubing and four reels of coiled tubing of the same diameter. Fluids investigated included water, guar, hydroxypropyl guar (HPG), and xanthan fluids at various polymer concentrations. It was found that the coiled-tubing curvature could reduce the drag reduction by 10 to 30% compared to straight tubing, depending on the flow conditions. The tubing curvature also delays the onset of drag reduction. The percentage of drag reduction in coiled tubing may be improved if fluid is pumped at higher rates. The results of the present study were also verified with full-scale experiments and were found to be representative of the drag-reduction behavior of similar fluids under field flow conditions.
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