This paper describes how multiphase flow simulation was used to assist the clean-up operation of an offshore oil well. The modeling complex involves the simultaneous transient flow of nitrogen, brine, and reservoir hydrocarbons. The dynamic simulation was used to decide the minimum drawdown to ensure a proper well clean-up, define the required ramp-up steps to avoid sand production, and estimate the total amount of liquid produced during the transient operation to confirm the topside has enough liquid handling capacity. The simulation results enhanced the understanding of the transient process and provided valuable guidelines for practical operation.

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