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Abstract Integrated production management is a crucial step in the field development stage, especially when elemental mercury is present in the reservoir fluid. In this study, the production optimization by considering the operational specifications through surveillance of mercury content at all development steps in a gas field located at the offshore Malaysia is presented. In this work, the existing fluid model was modified to include mercury content and demonstrate the phase behavior and the partitioning of elemental mercury in all phases. Then, the dynamic model was adjusted accordingly. A proper distribution technique was utilized to propagate the mercury through the field based on the available data. Some wells are shut-in in the field due to the imposed criteria of wellbore and surface facilities specification. The methodology in this study is used to monitor the mercury content and propose opening the inactive wells at the appropriate time and optimum production rate to ensure that the mercury content at subsurface and surface would sustain at feasible levels. Due to the low mercury content in the reservoir fluid, the impact of adding mercury to the components on the phase diagram and dew point pressure was not significant. The updated dynamic model addressed the mercury changes in water, condensate, and gas phases. There are two limitations on field production which are high mercury level in the wells located in the flank area of the field besides early water breakthrough of the wells due to aquifer drive. The mercury content is dependent on the reservoir quality, and it is changing across the field. The results of the mercury production of the model are consistent with the historical data. This study helped to increase the gas production of the field through opening the shut-in wells at appropriate timeframe and optimizing the production rate of the other wells by 15% while monitoring the mercury, which was quite considerable. Moreover, this workflow could be implemented on nearby fields with similar flow assurance issues. In this study, an innovative model was built by including the elemental mercury from reservoir rock to wellhead facilities. This study was able to monitor the mercury level at all producing phases (gas, condensate, water). Besides, the gas production rate of each well was optimized to meet the wellhead and facilities specification for mercury content and prolong the field economic life.