A comprehensive theoretical analysis of turbulent flow of apower law fluid in coiled tubing was conducted with theapproach of boundary layer approximation. Equations ofmomentum integrals for the boundary layer flow were derivedand solved numerically. Based on the results of the numericalanalysis, a new friction factor correlation was developedwhich is applicable to a wide range of fluids used with coiledtubing operations. The new correlation was verified bycomparing it with the published Ito correlation for the specialcase of Newtonian fluid. For non-Newtonian fluids, there isalso a close agreement between the new correlation and theexperimental data from recent full-scale experiments.
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