Following completion of the original Field B8 development study in 2009, EPConsult Energies was engaged by LOTOS Petrobaltic to update the original reservoir simulation model. Our Approach used updated PVT Tables for black oil simulator, updated vertical flow performance (VFP) tables, history matching to resolve the issue of high tubing head pressures and slow reservoir pressure decline in the model by using well test and observation data, and updated production history for the field and setting the production well's control on bottom hole pressure for prediction phase of the modelling. Four separate cases and two sensitivities were modelled in order to determine the optimum production profile.