This paper will discuss in details the balance between disposal system flexibility and system efficiency. Typically such systems are designed with some uncertainties from reservoir performance and production rates. This fact encourages designers and operators to oversize the system to be in the safe side. However, this approached comes on the expense of efficiency.

This paper describe an efficient approach to evaluate the existing water handling system within upstream facilities in terms of capacity and operation cost and to define the required upgrades and areas of optimization. This approach applies to upstream Gas Oil Separation Plants where produced water is gravity separated, treated and re-injected back into the producing formation. Water is therefore accounted for in the injection over all mass balance calculations.

The paper will show a new approach to effectively analyze produced water disposal systems and evaluate alternatives to significantly improve their efficiencies. This approach evaluates the whole system from the suction of the disposal pumps to the bottom of the disposal wells of multiple facilities simultaneously. Addressing the reservoir pressure, headers and laterals, pumps configuration and drive mechanism in details to be able to accurately balance required flexibility and improve efficiency. This approach addresses both short and long term optimization needs.

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