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Net Oil Computer Supplement 9
NOC Overview
NOC Overview NOC ConfigurationUsing the DisplayBefore You Begin
2.2.4 Required well data
The following information is required for each well that will be tested or measured by the
NOC system:
• Density of dry oil from this well, at reference temperature and reference pressure. To ensure
the most accurate net oil data, the density should be based on live oil rather than dead oil.
“Live oil” refers to crude oil at line pressure.
• Density of the water from this well, at reference temperature and reference pressure.
If the density values are not known:
• You can take samples of produced oil and produced water, perform laboratory analysis, and
enter the results into the well configuration.
• You can perform an in-line density determination for oil, water, or both (see Section 4.9).
During in-line density determination, the appropriate process fluid (water or live oil) is routed
through the sensor, density values are averaged over a user-specified time period, and these
values are converted to reference temperature. The water cut calculation uses these average
values for D
O
and D
W
.
• You can enter approximate values at initial configuration, begin measurement, and recalculate
NOC data at a later time when well-specific density values are known (see Section 2.3.7).
2.2.5 Water cut determination
There are two options for determining water cut:
• Density-based – The NOC application derives the water cut by applying the following
equation:
where:
- D
L
= Density of the liquid (oil/gas mixture), as measured by the Micro Motion sensor
- D
O
= Density of produced oil (user-supplied value)
- D
W
= Density of produced water (user-supplied value)
• Water cut monitor (external water cut) – A water cut monitor is used to measure the process
stream directly, and the Series 3000 transmitter retrieves the water cut data via a HART
connection. Accordingly, a HART connection between the primary mA output on the NOC
platform and the water cut monitor is required.
Water cut
D
L
D
O
–
D
W
D
O
–
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