Entrained Solids / Gas prove no match for ABLE SlugMaster
ABLE has successfully installed their SlugMaster system to solve a challenging produced water application on board the Talisman Clyde Platform.
Talisman Energy (UK) Ltd has been operating the Clyde Platform, situated in UKCS block 30/17b
some 360 kilometres East of Dundee, since acquisition of the asset from BP Exploration in January
1997. It is a fixed platform on which there are facilities for drilling, production, accommodation and
the associated utilities.
The Clyde Platform's processing facilities separate production from a number of different reservoirs,
exporting oil and gas via the Talisman Fulmar 'A' Platform to Teesside and St Fergus terminals.
To meet hydrocarbon in produced water regulations, it became necessary to meter the water
discharge to sea and also sea water/produced water volumetric flow rate prior to being injected
back into the well reservoir.
The produced water on Clyde - containing a degree of gaseous content - was a perfect application for the ABLE SlugMaster system. The SlugMaster system fully coped with the low back pressure observed downstream of the degasser vessel which was the defining cause of gas migrating out of
The ABLE SlugMaster uses two ultrasonic flow-metering technologies and a smart PLC to intelligently choose which technology to use, based on the process conditions. Constant metering
is achieved regardless of solids and gas contamination. The change over between the two
metering technologies is calculated with unique mathematical software, which enables exceptional
The importance of this measurement and the SlugMaster system is apparent in the penalties invoked by the DECC (formerly DTI) on produced water contamination levels. An excerpt from the
DTI trading standard scheme information states:-
1. If a permit holder fails by the date specified in rule 8.1(b) to surrender in respect of an
offshore installation operated by him a number of allowances equivalent to the number of
kilogrammes of dispersed oil in produced water certified in the verified annual return as having
been discharged from that installation, that permit holder shall be liable to pay a civil penalty
calculated in accordance with rule 10.3.
2. If a permit holder's registry account in respect of an offshore installation operated by him does
not contain sufficient allowances to facilitate a reduction of allowances under Rule 6.4.9(c) or a
withdrawal of allowances under rules 6.7 or 6.8, that permit holder shall be liable to pay a civil
penalty calculated in accordance with rule 10.3.
3. The civil penalty mentioned in rule 10.1 and 10.2 shall amount to GBP 280 (two hundred and eighty
pounds) per kilogramme of dispersed oil in produced water that is discharged in excess of
allowances surrendered or deficient in the registry account.
Talisman Metering Specialist, Baron Bennington, commented "Environmental measurement
legislation requires that Operators are currently required to measure produced water volume to no
greater than +/-10% uncertainty. The elimination of any significant errors in attempting to do this is
very important, as an over or under measure bias would mean we were saying we put more or less
water into the sea than we actually did. As the oil content is referenced to water volume this would
result in over or under reporting of oil discharged to sea."
To put it in to perspective, a small systematic bias in volume measurement on a site flowing 250,000
barrels per day into the sea would amount to a great deal over the course of a year.
The SlugMaster is now also available as a densitometer version for high gas entrainment
applications. The densitometer version enables precision compensation of the gas volume in the
liquid. Independent trials at the NEL shows that sub 1% accuracy is achievable with the densitometer
model even into gas volume fractions of over 30% significantly reducing the over read of liquid
volume caused by high levels of gas entrainment.
For further details regarding the ABLE SlugMaster, please contact ABLE on Tel: +44 (0)118 931188 or by email to email@example.com
ABLE Instruments & Controls provides control and instrumentation solutions for the Process and Research Industries, applying the most suitable technology for any given application. Through its access to a comprehensive range of instrument technologies, ABLE can offer the best available solution.
The company is actively involved in a wide range of industries including pharmaceutical, food, water, power generation, chemical, petrochemical, semiconductors, mining HVAC, oil and gas.
ABLE engineers cover disciplines which include flow, level, temperature, pressure, density, media analysis, moisture, humidity, process control and radiometry measurement.
Detailed knowledge of the instrumentation / process control market and the purchasing power accumulated via package procurement contracts, allows ABLE to be extremely competitive under any circumstance.
ABLE has a nationwide network of sales and support offices, while its manufacture, repair and calibration facilities are located at Reading, Berkshire.
Visit ABLE's web site at www.able.co.uk
For further information:-
Richard Sygrove, Sales & Marketing Manager
ABLE Instruments & Controls Ltd., Cutbush Park, Danehill, Reading, Berkshire, UK
Tel: +44 (0)118 9169401. Fax: +44 (0)118 9312161. email: firstname.lastname@example.org