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Datamate 2200 O&M
Page 39
7.11 Net Oil and Well Testing (Optional)
The Datamate 2200, when purchased with the Net Oil and Well Testing option, calculates
the net oil and net water (or saline water) present in an emulsion stream, utilizing
Chevron’s patented algorithm. This allows the user to integrate into one device the
capabilities of a Coriolis Transmitter and a Net Oil Computer.
Mass flow rate, density and temperature are obtained directly from the Coriolis sensor.
The standard Datamate 2200 will provide these direct measurements as well as volume
and concentration flow. Adding the Net Oil and Well Testing option allows to obtain
Water
Cut
, i.e., the volume fraction of water in the crude oil and water mixture at metering
conditions, Net Oil
rate and total (mass or volume of the crude oil corrected to standard
temperature) and Net Water
rate and total (mass or volume of the water or brine corrected
to standard temperature).
Water cut determination is based on the principle that Crude Oil and Saline Water have
different densities. Using the pre-determined, known densities of dry crude oil and
produced saline water at standard temperature, the Datamate 2200 will adjust them for
temperature effect and use them along with the measured density to obtain the volume
fraction of the produced water.
The net oil mass rate is obtained by multiplying the mass fraction of crude oil times the
mass flow of the emulsion stream, times the shrinkage factor1. Net oil volume rate is
achieved using the previous value divided by the density of the crude oil at the reference
temperature. Similar computations are performed for the net water rate.
To use the Net Oil functions, the user will have to set up the Well Data and Shrinkage
Factor. Datamate 2200 can store data for up to 30 Wells, saving for each one of these
the density of dry crude oil and density of produced water at the selectable reference
temperature of 60°F or 15°C.
The Wells Testing feature works with the Net Oil measurements and provides the tool
to run a
potential test
for a well. This test measures the largest amount of oil a well can
produce over a 24-hour period under certain fixed conditions. Basically, the test involves
allowing the well to produce for a given period of time and accurately measuring the
production. Lease operators perform
potential tests
both when first producing the well
(after completion) and again several times during its life.
To perform a well test, the user must input the information required to set up the Net Oil
feature plus the selected well number to use for the testing, type of purge (none, elapsed
time or dumps) and the time it will take for the test (0, 4, 8, 12, 20 or 24 hours).
1 At the allocation measurement point, a hydrocarbon liquid is normally at its bubble point (equilibrium vapor pressure) condition.
When this liquid is discharged to a stock tank at atmospheric condition, the light components in the hydrocarbon evaporate, causing
a reduction in liquid mass and volume. Therefore, a correction term called
shrinkage factor
may need to be applied to correct the
measured lliquid volume from metering condition to stock tank condition.
Summary of Contents for Datamate 2200
Page 1: ...Datamate 2200 Operating Maintenance Manual M 612 Rev G Datamate 2200...
Page 18: ...Datamate 2200 O M Page 12...
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