The heterogeneous nature of the North West Hutton reservoir has created manydevelopment infill drilling opportunities. Therefore in order to select an optimum completion string for the new infill wells with a reasonable degree of accuracy, a suitable multiphase flow correction for the North West Hutton field must be established first. Multiphase flow correlations analysis via the Multiphase flow Correlations Program reveals that, the Hagedorn and Brown correlation can be used together with the new version of the System Nodal Analysis Program. This is the best way of approximating tubing performance, in both naturally flowing and gas lifted wells with water cuts of less than 60% (aaproximately). beyond this limit, the Beggs and Brill correlation should be used especially in highly deviated holes. Sensitivity studies were also performed which show that wellhead pressure, wellhead temperature, gas-oil ration and solution gas gravity have considerable effect on predicted flowing pressure gradients in low water cut, naturally flowing wells. For tubing size selection, an oil well model was developed from typical North West Hutton well data, and was evaluated under two different productivity indices; namely a good productivity index (PI) of 5.5 b/d/psi and a poor PI of 0.2 b/d/psi. In a good PI, new infill well, the selection of a 5 1/2-ins tubing string was found to be more appropriate, as a significant increase in production could be realised compare to smaller tubing sizes at 0% and 30% water cut. In a poor PI well with 0% water cut, a 3 1/2-ins, tubing string was shown to be the best choice. The performance of the existing wells was also evaluated qualitatively, assuming that the 5 1/2-ins, and 4 1/2-ins, completions had the same well data as the model. Sensitivity studies reveal that the existing completions are correct and should remain unchanged in a good PI well with 50% water cut. However, considerable saving in operating costs could be realised by installation of insert strings in the existing poor PI, 4 1/2-ins, and 5-1/2 ins, completions with 0% water cut. Generally, this preliminary study is very useful in providing the basis for future optimum tubing size selection in the North West Hutton field.