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MassPhaseWet Gas Measurement System

Jiskoot Ltd

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MassPhase applications

• Wet gas metering • Use with existing or new wet gas meter (i.e. venturi etc)

• Measurement of liquid/gas mass ratio to allow compensation of meter for over-measurement caused by liquid content

• Using Murdoch, Chisholm, de Leeuw etc. equations

• Provide liquid and gas compositional samples.

• Hydrocarbon valuation from samples

• Well testing for high GVF wells (>95% GVF) • Higher accuracy that wet gas and multiphase meters

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MassPhase commercial benefits

• Allocation measurement• Improve measurement accuracy to reduce the taxation

revenue burden

• Better partner revenue allocation on shared production facilities

• Cost effective and accurate revenue allocation for margin assets produced using shared facilities

• Well testing• High accuracy well test data for improved reservoir

management

• Increase well test frequency reducing uncertainty

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Measurements

• Highly accurate liquid/gas mass measurement • Each system is an application specific design

• Liquid mass measurement is typically better than 0.5%

• Gas mass measurement is typically better than 0.5%

• Sample of dry gas for analysis

• Sample of liquids for analysis• Allowing determination of component ratio, densities and

valuation of any hydrocarbons

• Manual or automatic system

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The alternatives

• Spot sample• Completely unrepresentative

• Dye tracer• Expensive, difficult to operate and high uncertainty

• Wet gas meter• Measures liquid fractions but not components

• (i.e. water, methanol and condensate etc)

• Lower accuracy - typically +/- 5%

• Multiphase meter• Not suitable for applications above 95% GV

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Patented design principle

• Extract a representative bypass loop from the main pipeline

• Filter the liquids into a molecular sieve of known mass – this dries the gas

• Measure the mass of dry gas

• Measure the accumulated mass of liquid in the sieve

• Use the accumulated mass of liquid in the sieve for analysis

• Extract a sample of dry gas for analysis

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Wet gas sampling system

Molecular Sieve

Mass flow meter

Gas sample receiver

Wet Gas sample loop

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Wet gas sampling – Step 1

Loop is flowed to stabilise pipe-work (P&T)

The mass of empty molecular sieve is known

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Wet gas sampling – Step 2

Flow diverted through mole sieve and mass flow meter

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Wet gas sampling – Step 3

Mass of dry gas measured and mass of liquid accumulates in molecular sieve during sampling

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Wet gas sampling – Step 4

Sample of dry gas taken

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Wet gas sampling

• Dry gas mass determined by flow meter

• Liquid mass determined from increase in molecular sieve mass caused by liquid retention

• Normal dry gas sample used for composition analysis

• Liquids are removed from the molecular sieve to provide a sample for composition analysis

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Sample loop extraction

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Maintain representivity

• The profile probe, inlet system and loop are sized to ensure representivity, the required velocity and volume throughput

• Loop is designed with no liquid traps, drop out points or constrictions where aerosol formation could occur

• System designed so that flow rate can be adjusted/changed to meet future flow conditions

• Either using multi-stage regulated let-down (to the flare stack) or returned downstream

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Liquid mass measurement

• If you take a 1 litre spot gas sample it is not possible to determine the liquid/gas ratio or the composition because the liquids would be lost in the overall measurement. • Mass or volume is too small to measure or extract from

the sample

• Vessel: 1 litre volume (15kg)

• Liquids: 2.1ml (1.7gm) (typical)

• No mass measurement system has the required accuracy AND turndown

• Volumes so small that it is likely to be entrained on receiver walls or lost in dead volumes

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Uncertainty - conclusions

• Uncertainty is mainly determined by slipstream sampling methodology

• Slipstream error is minimised by ‘belt and braces’approach of optimising dispersion and multipoint profiling.

• Mass accuracy of loop flow meter is typically 0.35%

• Extracted liquid mass accuracy is typically 0.20% - 0.33%

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Options

• Multiple systems in single cabinet

• Manual system

• Automatic system

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BP Juno project

• Sample take-off installed downstream of venturi, in well mixed flow

• Flow regime, mist flow, no slugs predicted

• Liquids contain condensate, methanol and water

• 15:1 turndown

• Now installed offshore

• UK southern gas basin

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BP Juno project

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BP Juno project

Dual wet gas measurement system for BP Juno Project

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Data set required for system design

• Gas void/mass fraction

• Water/condensate/methanol ratios

• Fluid densities

• Liquid and gas composition

• Predicted flow regimes

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Sample recovery

• Dry gas sample from discharging constant pressure receiver

• Liquid sample extracted from mole sieve using heating/cooling process

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Mole sieve heater

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Thank you