In a production development project (PDP) many disciplines work, arising with a set of inherent uncertainties, which are quantifiable or not. A well-represented set of these uncertainties should lead to a realistic stochastic spectrum of production forecast, however only a part of these uncertainties is usually consider in the process. This paper presents an integrative proposal between different uncertainty areas inherent in a DP project, from the association of reservoir and activities schedule, driving to more accurate assessment of the probability spectrum and production-curve-based schedules optimization opportunities, assisting the decision making process. It was noticed that the impact on production forecasts may be significant when the uncertainties in the schedules are evaluated together with the reservoir uncertainties, especially in the short term. Moreover, the opportunities identified when reservoir and schedules are assessed combined can lead to a significant improvement in production forecasts and indicates flexibility and robustness gains.

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