Emerson MMI-20011276 Manuel D’Utilisation

16

The terms used in NOC measurement are listed and defined in Table 2-1. These terms are used in a 
variety of process variables and locations throughout the NOC application.

Gross

The sum of the oil volume and the water volume, as measured by the NOC application. 
If TMR carry-over is implemented, this value includes oil and water from the gas leg.

Net oil

Oil only, measured by volume, corrected to reference temperature, with the oil 
shrinkage factor applied. If TMR carry-over is implemented, this value includes oil from 
the gas leg.

Water cut

Percentage of water in production stream, corrected to reference temperature, with the 
water shrinkage factor applied.

Uncorrected water cut

Percentage of water in production stream at operating conditions.

Net water 

Water only, corrected to reference temperature, with the water shrinkage factor applied. 
If TMR carryover is implemented, this value includes water from the gas leg.

Back flow

Uncorrected volume flow moving backward through the sensor.

Uncorrected oil

Oil only, through the oil or oil/water leg, measured by volume, with no corrections 
applied. Any configured pressure compensations are applied. Temperature correction 
and shrinkage factors are not applied.

Uncorrected water

Water only, through the oil or oil/water leg, measured by volume, with no corrections 
applied. Any configured pressure compensations are applied. Temperature correction 
and shrinkage factors are not applied.

Uncorrected gross

Raw volume flow measurement from the oil or oil/water leg.

Density

Density of the mixture, with no corrections applied.

Carry-over

Oil and water entrained in the gas stream and added back to the net oil and net water 
measurements

Carry-under

Gas entrained in the liquid stream

Gas volume

Volume of gas in the gas stream, calculated by the NOC application from mass flow 
data from the gas meter

Actual

Flow rate as measured at the time of viewing

Average

Rolling average, calculated from the beginning of the applicable time period.

Total

Rolling total, calculated from the beginning of the applicable time period.