The Data Validation and Reconciliation statistical methods are applied to the modeled process, using available measurements and their uncertainties.
The Gas Oil Separation Plant with its different production wells is fully modeled inside the software, based on the process flowsheets. Full mass and energy balances are used through the whole plant, as well as equipment curves, equations and sensors measurements.
Crude composition is fully established, as well as thermodynamic properties and Equation of State, allowing to know the state of the streams at each point of the process based on pressure and temperature conditions.
The model processes the measured values as an input for its DVR calculations, allowing the reconciliation of the different sensors, based on other sensors and equations.
The Gas Oil separation process is similarly modeled. The different pieces of equipment of the plant are integrated to the model. The full thermodynamic knowledge of the production, in association with the pressure and temperature measurements, allows an accurate representation of the thermodynamic states and compositions across the separation process.
VALI 5 offers the possibility to define soft sensors for every node of the model. This allows the software's user to retrieve decisive information for process management, such as temperatures, pressures or gas volume fraction, based on process measurements and accurate modeling of the plant.
This functionality can also be used as a Virtual Flow Metering tool, allowing an accurate knowledge of what is going through the process. These soft sensors, thanks to a full thermodynamic knowledge of the crude oil, can be defined either in process or at standard conditions of pressure and temperature.
These different variables are available at any time, thanks to an online workflow module allowing automated hourly calculations.
Knowing exactly what is coming from the different production wells, it has never been easier to allocate back the total measured production of gas, oil and water. Full mass and energy balance through the whole process guarantees consistent flow rate values between the inlet and outlet streams of the process.
Data Reconciliation allows to detect wrong sensor measurement thanks to equipment equations and measurement redundancy. Corrected calculated values are provided by VALI 5, with decreased uncertainties on the measurements.
The possibility to create KPI's and follow equipment performances over time is another functionality provided by VALI 5. Equipment curves and equations can be validated or reconstructed based on historian data of the process.
Once reconstructed, the curves can be integrated back in the model, and bring one additional level of redundancy, therefore improving the model robustness.