WFA - Well Flow Analyser
Well Flow Analyser is invented by Sensorteknikk. The principle could be describes as a principle extracting
information in acoustic signals from a multiphase fluid that passes
through a choke valve or a turbulence creating means.
The principle is based on the fact that a fraction of the
kinetic energy of the through flowing fluid is transformed into
acoustic energy, which contains a wide acoustic spectrum.
This spectrum is a function of several parameters that
characterise the composition of the flow.
The acoustic signals are picked up by an acoustic sensor
clamped on the outside of a choke valve or another suitable flow
processing the acoustic signals and then use multivariate data
analysis, models are built based on existing data and could be used
for future prediction of incoming data.
The compositions and amount of oil, gas, water and particle
content in the flow are then obtainable for the user.
sensor installation is very simple and does not require modification
of flow lines or valves. Test
installations made by Sensorteknikk at various test rigs and
facilities, i.e. Trecate Italy, Ceesi Colorado and Kårstø Norway,
successfully verify that the WFA probably is one of the most accurate
way to perform a multiphase flow metering.
Figure - On top the signal processing of the Well Flow Analyzer. Spectral presentation for phase composition (left) and variation in flow rate.
Figure - The Well Flow Analyser (WFA) system. The three screen graphs are the levels of each media (oil, gas and water) from the well.