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TX 75083-3836, U.S.A., fax 01-972-952-9435. AbstractA comprehensive theoretical analysis of turbulent flow of a power law fluid in coiled tubing was conducted with the approach of boundary layer approximation. Equations of momentum integrals for the boundary layer flow were derived and solved numerically. Based on the results of the numerical analysis, a new friction factor correlation was developed which is applicable to a wide range of fluids used with coiled tubing operations. The new correlation was verified by comparing it with the published Ito correlation for the special case of Newtonian fluid. For non-Newtonian fluids, there is also a close agreement between the new correlation and the experimental data from recent full-scale experiments.