Allocation and production accounting make use of various methods to track components, estimate volume change and equate shrinkage factors. Complications arise when the phase behavior of gas and liquid streams are not fully captured by the system. Estimating, for example, the reduction in liquid volume due to introduction of lean gas requires the allocation system to be able to capture the vapour pressures and solubilities of the hydrocarbons, including the heavier components. The system is also required to continue to account for these properties as composition and conditions change throughout the field and facilities.
VMGSim provides a platform for allocation and production accounting suitable for a single well or a system wide VMG-F.A.C.T.S. model that includes hundreds of wells. VMGSim’s new PIONA composition matrix creates a foundation for tracking the composition and properties through blending, separating and processing of streams. VMGSim’s thermodynamic engine involves all components captured in the matrix in a rigorous, high-fidelity flash. Wellhead composition and production data allows VMG-F.A.C.T.S. to relate hydrocarbons seen at sales to their origin. The system takes account of volume and phase change due to pressure, temperature and composition including the interaction of the constituent hydrocarbons. The ability to integrate VMG-F.A.C.T.S. with your data management systems allows allocation and production accounting to be updated with the recorded state of the field to track change with time.
The distribution of NGL components between phases and the solubility of light hydrocarbons is captured by VMGSim providing a solid accounting basis for shrinkage, volume change and component allocation.
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