Daniel Finfer, Silixa’s Head of Applications Development, will be presenting at OFSIS 2017 in Brisbane, Australia on 8th – 10th January 2017.
The presentation titled Flow monitoring of industrial slurries and oilfield production using the Metering intelligent Distributed Acoustic Sensor (MiDAS) will reveal the results of the world’s first pilot installation for a nonintrusive, multizone flow metering system based on distributed acoustic sensing (DAS). (Authors: Daniel Finfer and Mohammad Amir (Silixa Ltd.); Phil Newman, Steve Amor, Neil Rein, Clinton Naicker (Anglo American PLC)
Silixa was commissioned by Anglo American to execute the DAS-based pilot installation at eMalaheni Water Reclamation Plant (EWRP), where 30 ML per day of Acid Mine Water (AMD) is reclaimed from local coal mines for use as both drinking water and within mining operations.
During this pilot, 6 separate liquid flow zones in 3 different regions of the plant were instrumented using a single optical fiber. Zone 1 of the installation featured a large scale HDPE water supply line feeding water from the surrounding mines into the plant. This pipe is metered continuously using a conventional magnetic flow meter, making it straightforward to obtain reference flow rates. The HDPE flow line in Zone 2 handles water processing slurry, the solids content of which varies over time. Zones 3-6 were installed along on a multibranch stainless manifold handling high rate liquid flow. Reference data in this last region of the plant was obtained via a clamp-on ultrasonic meter.
During the course of the 6-week pilot, flow rates were monitored continuously using the MiDAS system, and automatically uploaded from the plant in rural South Africa to the Silixa Headquarters in London. MiDAS output was compared with the rates obtained by Anglo American using conventional sensors. It will be shown that the sensing layout was straightforward to install, and that the output is in good agreement with conventional sensors. Opportunities and challenges for large scale future applications of this nonintrusive system will be considered.
In addition to applications on industrial slurries as described above, Silixa will describe recent experience gained using this same opto-acoustic sensing architecture for the measurement of multiphase flows in the oil and gas industry. It will be seen that the MiDAS flow monitoring technology offers a robust approach to flow rate measurement and composition trending for oilfield production across the full range of gas void fraction (GVF) and water in liquid ratio (WLR).
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Related Links: OFSIS 2017
Image by AwOiSoAk KaOsIoWa, CC BY-SA 3.0, Wikimedia Commons