NetSim is a powerful, integrated program that determines pipeline network capacity by balancing flow losses in the network with well deliverability. Sensitivity analysis on the system configuration maximizes capacity while simulating the system at a specified set of conditions facilitates flow assurance. When desired, a sophisticated, non-linear optimization program (ProOpt) "oversees" system operation to maximize profit subject to operational constraints.

The Network Simulation (NetSim) program predicts the flow capacity of a system of pipes connected in a network structure. Supply nodes - typically oil and/or gas wells - represent points in the network where fluid is introduced. The pipe network commingles flow to either a common terminal facility or set of specific sales points. Distribution segments in the network are setup by introducing sales nodes - that is, points in the network where fluid is removed. Any number of pipes can be used to define network connections and describe the elevation terrain traversed. Equipment such as separators, pumps, compressors, heaters, chokes, etc. can all be included in the description of the network.

NetSim provides comprehensive flow performance technology for a wide variety of fluids including single-phase gas, single-phase liquid, multiphase gas-oil-water systems and multiphase single component systems (e.g steam or CO2). Both pressure and temperature profiles are determined throughout the network.

The single well performance model, Well evaluation Model (WEM), is FULLY INTEGRATED with NetSim and generates individual well rates as required by NetSim. Should any single well require separate analysis, the user simply selects the well on the network schematic to open the WEM program and the well data is automatically loaded into memory. All design and sensitivity features available in WEM are then available to optimize well productivity. When WEM is closed, the next run of NetSim automatically includes the updated well model, provided the user elected to update any edited well data.


Optimize Field Operating Strategy

The NetSim solution for total field rate depends on how the wells are operated. For example, the rate for a naturally flowing well is governed by adjusting a wellhead choke; the rate for a gas lifted well is governed by adjusting the lift gas circulation rate, etc. During a NetSim iterative solution, individual well rates are manipulated by the Production Optimization module (ProOpt). ProOpt systematically adjusts well rates using a "constrained, Non-Linear Optimization" algorithm so that the final NetSim solution maximizes net revenue subject to facility limitations such as water disposal capacity, separator limitations, compression horsepower, contract gas rates, etc.