Applying the Rosemount Model
3095MV™
on a Gas Lift
 The Rosemount Model 3095MV™ is a Multi-variable
mass flow meter which measures differential pressure, pressure, and temperature. These
measurements, along with information about the process fluid, are used by an internal flow
computer to calculate the mass flow rate of the process fluid. This measurement and
calculation result in an accuracy better than 1% of rate over a range in flow rates of
8:1. The mass flow rate and each individual measurement (DP, P, and T) are available as
digital or analog 4-20 mA signals.
Gas Lift
Many oil wells require an artificial means to assist in the oil recovery. Gas lift
works by high-pressure continuously injecting relatively natural gas into the well to
reduce the flow gradient. The gas aerates the crude, reducing its weight which allows it
to flow to a production separator on the surface. A gas lift takes advantage of the
well’s produced gas energy. It is a popular technique in off-shore wells where space
is at a premium or a high amount of solids (sand) are present. Automation systems help to
increase oil production, reduce compressed gas consumption, and more efficiently use
manpower.
Flow Measurement
The measurement of the gas flow into the well for gas lift applications is critical
to provide an optimal economic payback. Each well has its own unique characteristics and
therefore a unique optimal flow rate. As gas flow to the well is increased the pressure at
the bottom of the well falls off rapidly due to the reduction of the gradient; however, as
gas is increased further the pressure decreases much less and the curve becomes almost
flat. As additional gas is injected, oil production will actually decrease as the gas
displaces oil in the well bore. Further addition will increase pressure due to friction
loss and actually reduce production.
 Measuring the mass
of gas flowing into the well increases a producers’ ability to improve efficiency of
the overall operation. A cubic foot (volume) of gas at the surface is not the same as a
cubic foot of gas in the formation due to changes in temperature and pressure. The 3095MV
will measure the actual standard cubic feet of gas, which will be the same amount
(mass) of gas at any operating pressure and temperature. This allows a producer to
distribute and inject a much more precise amount of gas to the formation as conditions
above and below ground change. The exact amount of gas at each compressor and well head
can be accurately measured using the 3095MV.
The 3095MV can help to optimize gas lift operations by significantly improving
measurement accuracy and simplifying installation, with one compact device that accurately
measures and computes mass flow rates.
For more information, link to the 3095 MV Product
Page or Call Customer Central at 1-800-999-9307 or 952-906-8888 to discuss how the
Rosemount Model 3095MV can be used in your applications.
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Emerson Process Management,
Rosemount Division, 8200 Market Blvd.
Chanhassen, MN USA 55317
North America: 1-800-999-9307 International:
952-906-8888 Fax: 952-949-7001
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