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Net Oil Computer Supplement 13
NOC Overview
NOC Overview NOC ConfigurationUsing the DisplayBefore You Begin
Figure 2-8 Hold Last Value effect on density measurement
2.3.5 Gas measurement
If you want the NOC application to report gas flow data:
• A mass flow gas meter must be installed on the gas leg
• The gas meter must be connected to the Series 3000 platform via the frequency input
• The density of produced gas at reference temperature and reference pressure must be
configured in the NOC application
The Transient Mist Remediation option may be implemented to provide more accurate gas flow data
during conditions of liquid carry-over. See the following section for more information on TMR.
If gas measurement without TMR will be implemented, the gas meter may or may not be a Micro
Motion product. If gas measurement with TMR will be implemented, the gas meter must be a Micro
Motion product.
2.3.6 Gas measurement with liquid carry-over – Transient Mist Remediation
Transient Mist Remediation (TMR) is an optional feature of the NOC application. It is used to
provide more accurate gas flow data during intermittent liquid carry-over – liquid entrained in the gas
stream. Additionally, because the liquid is assumed to be a mixture of oil and water in the same
proportions as in the liquid stream, the NOC application provides the option of adding the estimated
quantities back to the net oil and net water values from the liquid stream. This “addback” option
provides a more accurate measurement of total oil and water production from the well.
In addition to the gas measurement requirements described in the previous section, TMR requires
drive gain data from the TMR gas meter. Accordingly, a HART connection must be set up between
the primary mA output on the NOC platform and the TMR gas meter.
Variations in the drive gain from the TMR gas meter are used to detect liquid carry-over. When the
drive gain exceeds a user-specified threshold, liquid is assumed to be present in the gas stream. The
transient mist interval persists until drive gain is below the configured threshold.
To determine the value to use for the drive gain threshold, observe drive gain values for the TMR gas
meter during various flow conditions.
Density
(used in NOC calculations)
Drive gain (actual)
Averaged retrieved
density value
Drive gain setpoint