The published work literature on pressure drop in a single phase flow is reviewed.While many papers have been published on the prediction of bottom-hole pressure in single phase vertical gas wells; there are not many studies that show the effects of friction on this flow of interest. A model has thus far been derived from first principle as an improvement over Sukkar and Cornell's approach of calculating bottom-hole pressure by the introduction of friction factor in the turbulent region.

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... ed friction factor under varying conditions are explicitly discussed.Finally, two models are compared, one considered the friction effect while the other assumed a non friction factor.