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part of Aker
© 2008 Aker Solutions
MEG Regeneration –Separation Challenges
Separasjonteknologi 2009
By Shanta Seereeram
Aker Process Systems AS
Aker Solutions
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Outline
■ MEG – General Overview
■ Separation Requirements■ Technology Experiences
■ Future Development
■ Summary
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■ Formation of Hydrates
■ Characteristic for remotetie-back gas fields with long(e.g. 100-200km)multiphase pipelines
■ Risk of hydrate formation:
● Natural gas
● Free water present
● Low T - High P
■ A closed MEG loop willbecome contaminated withsalts/particles from the gas
production
MEG – General Overview
Typical Hydrate form ation curve
0
100
200
300
400
500
0 5 10 15 20 25 30
Temperature [degC]
P r
e s s u r e
[ b a r
HI
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Closed loop MEG System
Slug Catcher
Condensate
Rich MEG Storage
Water, Salts, Corrosion Products
Lean MEG
Storage
Well stream:
Gas / condensate
Formation water
pH-stabilizer
Completion fluids
Corrosion inhibitor
Gas
processing
Pipeline corrosion
Condensate
MEG
Reclamation
MEG – General Overview
MEG Pre-
treatment
Rich
MEG
Lean
MEG
Condensed water
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■ Rich MEG/Gas/Condensate Separation
● Flashing
● Gravity Separation
■ MEG/Water Separation
● Distillation
■ Salt separation
● Precipitation (in a controlled manner)
● Particle removal
Main Separation Requirements
Scale in pipeline
Scale in Distillation Column
Most challenging area in MEG Regeneration
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Salt Separation
CHEMISTRY CONTROL
■ Low soluble salts (Ca2+, Mg2+, Fe2+, CO32-, HCO3
-)● Divalent cations will easily precipitate thus forming scale on undesired
locations at low concentrations
● Precipitation by alkalinity and temperature control
■ High soluble salts (Na+,K+, Cl-)● Monovalent cations may accumulate up to > 75000 mg/l without
precipitation
● Precipitation by evaporation
Precipitation in a controlled manner in specific locations
All salts must
be removed
Some levelcan be
tolerated
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Ormen Lange
(Norsk Hydro)Full-stream Reclamation Shah Deniz
Vacuum boiling
Salt precipitation
Centrifuges
Main Separation Requirements
Temperature increase
Pressure decrease
Rich MEG Pre –
Treatment &
Storage
Lean MEG storage
and Injection
MEG
Reconcentration &
Reclamation
Low & high
Soluble salts
Rich MEG
Feed
Hydrocarbons Water
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Ormen Lange
(Norsk Hydro)
Slip-stream Reclamation Ormen Lange
Atmospheric
boiling
Main Separation Requirements
Rich MEG Pre –
Treatment &Storage
Lean MEG
Storage & Injection
MEG
Reconcentration
Low soluble salts
Rich MEG
Feed
Hydrocarbons Water
Reclamation
Vacuum boiling
Particle precipitation
Centrifuges
High soluble saltsTemperature increase
Pressure decrease
Alkalinity controlParticle precipitation
Centrifuges/Settling
tanks
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Technology Experience
Decanter Centrifuges
■ Installed and operated on● Asgard B (Norway)
● Shah Deniz (Azerbaijan)
● Britannia Satellites (UK)
● KG-D6 (Reliance - India)
■ High speed rotation – up to 3000g■ Particle removal down to 10
microns
■ Removal of high and low solublesalts
■ Preference for dry product (lessthan 5% moisture content)
■ Low MEG loss
Standard part of the APS MEG Regeneration unit
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Technology Experience
Disc-stack Centrifuges
■ Installed and operated on
● Ormen Lange (Norway)
■ Testing
● Gorgon
■ Removal of low soluble salts from Lean MEG
● APS independent testing
■ Removal of low soluble salts from Rich MEG■ Effect of entrained condensate on efficiency
■ High centrifugal forces – 5000 to 7000g
■ Remove of particles down to 1micron
■ Preference for clarified liquid phase
■ Small footprint
■ Down stream equipment required to reduce MEG loss
To be installed on the Gorgon Project
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Technology Experience
Settling Tanks
■ Installed and operated on
● Reliance KG-D6 (India)● Pluto (Australia) – to be commissioned in
2010
■ Gravity settling
■ Remove of particles down to 10microns
■ Secondary treatment required to remove smallerparticles (e.g. Filters)
■ Large footprint (only feasible for onshoreapplications)
■ Stable conditions (i.e. no movement)
■ Down stream equipment required to reduce MEGloss
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Future Development
Market Trends
■ Larger MEG Regeneration requirements■ Development of gas fields with high salt content formation water
■ Increase in offshore and FPSO applications
● Limitations on space and power usage
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Future Development
■ Solid-Liquid Cyclones
● APS has extensive experience with cyclones■ Oil/water cyclones
■ Sand cyclones
● Solid-liquid separator with no moving parts
● Compact
● Removal of particles down to 10 microns
● On-going research work (University of Bergen)■ Gas Flotation
● Use of micro-bubbles to float particles out of solution
● Patent filed
● Looking for partners to test and qualify technology
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Summary
■ Salt removal in MEG Regeneration systems is a challenge
● Can be achieved through good chemistry control & properseparation equipment
■ Use of decanter centrifuges to separate large particles is veryeffective
■ The most effective/compact method for small particle removal is
through the use of disc stack centrifuges■ Settling tanks in combination with downstream polishing methods
can be used as an alternative to disc stack centrifuges, however notconsidered feasible in offshore applications
■ Looking into alternatives to reduce footprint and complexity
● Solid-liquid cyclones● Flotation
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Contact Details
Product & Technology Manager
Jon Even Vale
Telephone No: +47 67513655 / mobile +47 97146179
E-mail: [email protected]
Sales Director
Simonetta Brossa HoelTelephone No: +47 67837771 / mobile +47 41400998
E-mail: [email protected]
Technical Contact
Shanta SeereeramTelephone No: +47 67527229
E-mail:[email protected]
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Copyright
Copyright of all published material including photographs, drawings and images in this documentremains vested in Aker Solutions and third party contributors as appropriate. Accordingly, neither the
whole nor any part of this document shall be reproduced in any form nor used in any manner withoutexpress prior permission and applicable acknowledgements. No trademark, copyright or other noticeshall be altered or removed from any reproduction.
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