Virtual Metering System
MSi Kenny's Virtuoso®/VMS is used to estimate wellhead flow rates based on the normally measured pressures and temperatures in and around the well and the well choke position. An estimate of the oil, gas, and water production rates is determined by using multiple models to estimate flowrate and then statistically combining their outputs to determine the best estimated production rates. The use of multiple models leads to accurate flowrate estimates that are robust in the event of instrumentation failure.
The system is designed for unattended operation so the system automatically collects process data and calculates the flow rate estimates and alarm information. The calculated flowrate information can be transmitted automatically to SCADA, DCS or process data historian system in real time.
Virtuoso/VMS is made up of four building blocks/models:
- an inflow performance model,
- a transient wellbore model,
- a choke model, and
- a well jumper model.
It is important to use multiple models to estimate flowrates because model accuracies vary depending on flow regimes. Using these four models, nine distinct flow rate estimates are made. The nine flow rate estimates lead to a more accurate
Well Instrumentation
All of the well instrumentation is displayed showing the actual as well as filtered values. Values can be filtered based on a number of criteria. Bad values of replicated instruments can be filtered out instead of just averaging the values to an obvious incorrect value. Instrument quality is displayed by the background color in the value box. Green means it is OK. Magenta means that the value is frozen and has not moved for a user definable period and cannot be trusted. Red means the the communication to the data server is lost and not updating.
The well instrumentation screen displays these values for bottom measurements, master valve, wing valve, before choke measurements, choke valve and after choke measurements.
Flowrate Information
The Well Detail Screen provides information about the well flowrate values and accuracies for gas, oil and water. The flowrate and uncertainty calculated by each method and displayed in a box-and- whisker plot so you can easily see if a method is an outlier.
The best estimate of the flowrate is displayed as the vertical red line. The user may selectively add or subtract methods based on current instrument availability. .
Continues on the next page but on the website it is a scroll down not a new page.
Status/Overview screen
Status/Overview Screen shows the overview for production for each well, displaying:
- Warnings/Alerts
- Choke position
- Wing valve position
- If well is going through the Test Separator
- Gas flowrate
- Condensate flowrate
- Water flowrate
- Uncertainty
- Before choke temperature
- Before choke pressure
- Sparkline trends of the before choke measurements
Tuning VMS
The Tuning screen allows for tuning of certain VMS parameters to maintain accuracy. The Well Tuning Screendisplays parameters that
affect the calculated flowrate when they are revised.
Flowrate Cumulatives
The flowrate cumulative screen can be configured to provide totalized values based on user specific criteria. Cumulative values can be displayed in the Cumulatives screen.
Of course, all flowrate data can be passed automatically to a SCADA or data historian system for use by many functions throughout the company. Cumulative Screen displays the cumulative production rates by phase for each well
Other Functions
Other useful functions include:
- Login Logout
- Privileges based on login
- Automatic trending of any displayed value
- Display up to 8 variables in one plot
- Toolbar for quick access to frequently
used functions - Create groups of saved trends so you do
not have recreate them again - Alarm summary page that can be sorted
- Send alarms to SCADA
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