This paper describes the wide application of Production Simulator System in deep water gas field, its benefits and effectiveness. Deep water and subsea production system requires transportation of a mixture of gas/water through long subsea tiebacks from the producing well to existing production facilities.

Production Simulator System is extensively utilised by Subsea operators for planning their day to day operations and predicting the systems response to current conditions and/or operator actions. The networked production software allows users to optimise and improve the system performance by monitoring wells and facilities.

The optimisation process goes beyond basic operations, but extends into predicting impact of wells/manifolds start-up/shut down, subsea interventions on system performance and its deliverability. The tool also provides study on the integrity of subsea pipelines and critical flow for mid water pipelines to prevent shutdown of manifolds. Simulation studies have presented results, which were precisely similar to the real time data.

While use of long subsea tie backs allows for better project economics, long flowlines causes additional backpressure on the well tending to reduce flow rates due to liquid hold up and/or backpressure increase thereby affecting ultimate recoveries. The succeeding sections in this paper will discuss how such tie-backs tend to under-utilise reservoir energy and presents alternatives for improving field life and enhance the system efficiency.

Efficient monitoring of subsea gas well behavior, subsea system integrity, analyzing subsea pipelines performance and predicting problems with the software optimisation tool has resulted in significantly decreased downtime and effectively assisted in taking decisions for maintaining well production.

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