Emerson MMI-20011276 Manuel D’Utilisation

9

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).

There are two options for determining water cut:

•

Density-based – The NOC application derives the water cut by applying the following 
equation:

where:

-

 = Density of the liquid (oil/gas mixture), as measured by the Micro Motion sensor

-

 = Density of produced oil (user-supplied value)

-

 = 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

–

-----------------------

=