In this project a one dimensional and steady state numerical model (FloWell) for describing wellbore behavior has been conducted. The wellbore simulator solves the continuity, energy and momentum equations using the ode23 function built in MATLAB. Validation of FloWell shows that the Homogenous (with slip ratio equal to one) and Rouhani-Axelsson void fraction correlations give good results for a liquid dominant well in Svartsengi in Iceland. A numerical analysis is performed with the iTOUGH2-PEST package to improve the model design in FloWell. The case study shows that parameters in void fraction correlations can be adjusted with the package so that simulations with FloWell fits measured data. Further work will include simulations of more wells with different characteristics and the future goal is to couple the wellbore simulator FloWell with the reservoir model TOUGH2.

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