proserv - sand challenges...2018/03/19 · • sand production prediction is unreliable – comes...
TRANSCRIPT
Month Day, YEAR
Sand Challenges
Nov, 2019
James Banister
Sand and Solids PLM (Global Technology Manager)
Applications and Process Engineering Manager
Montrose (UK)
NOV Wellstream Processing
Introduction
Who we are.
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NOV Wellstream Processing
Wide technology portfolio
©2019 NOV | Proprietary and confidential. Process and Flow Technologies |
NOV Wellstream Processing
Deep fluids expertise
Fundamental
analysis of fluids
behaviour
Fundamental
chemistry
analysis
Modelling
of flow pattern &
depositions
Performance monitoring
& fluids characterisation
at site
Performance
evaluations &
optimisations
We think fluids behaviour − not just hardwareWe understand the interactions
between technologies
TEG - Johan Sverdrup SWT - Catcher MEG - Ichthys
SEP - Vessel Internals PWT & SAND - Mariner CRUDE – Johan Sverdrup
1978Kværner Process
Systems
1979Merpro is
founded
1997First sale of MEG
reclamation
system
1991Tore™
technology is
developed
1994Petrex is
founded
2011NOV acquires
Merpro
2012NOV acquires
Petrex
2014Demerger of
Aker Process
Systems;
renamed Fjords
Processing
2015NOV acquires
ProFab
fabrication yard
2016NOV acquires
Fjords Processing
Wellstream
Processing is
formed
2013APS acquires Opus
Maxim including
Flotta facililty
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Separation Processes
• Where solids impact
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Separation ProcessAnd impact of solids
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Separation Process
Chokes
Maximise production
But monitor solids to:-
-limit/prevent erosion
- keep within limitations of
downstream
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Separation Process
Separators
Gradually fill with 150+
micron sand.
Slugging/upsets can lead to
sand surge downstream.
Loss of separation
performance.
- Filling
- Stabilisation of emulsions
De-pressurisation changes
acidity – can lead to fouling
(naphthenates)
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Separation Process
Deoiling Hydrocyclone
Erosion
Blocking
Separation dependent on
viscosity
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Separation ProcessDegasser
80+ micron solids
Gradual filling
Can impact OIW
Co-mingling of water streams
leading to scaling
Reservoir
Pore size?
Injectivity
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Case Study A
• Condensate Field
• Late life
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A Condensate Flow Scheme
A Wells
B Wells
C Wells
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A Condensate Flow Scheme
Blocking with SolidsSolids stabilised emulsion
High WIO
Blocking with Solids
Not used
Slugging
problems
A Wells
B Wells
C Wells
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A Condensate Flow Scheme
A Wells
B Wells
C Wells
Check for chemical impacts
Surface active additives
Avoid over-dosing
Early Solids Removal
Provide residence time for solids drop-
out from water layer
- weirs and levels
- keep solids out of oil
Minimise Shear of oil/water/solids mix
Convert 2-phase to 4-phase separation
Remove/replace clogging and blocking
internals
Remove cartridge filters
Plus measures to improve OIW…
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A Condensate Flow Scheme
A Wells
B Wells
C Wells
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ToreOVD(Tore Online Vessel Desanding)
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A Condensate Flow Scheme
A Wells
B Wells
C Wells
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CYCLONE SIZE SELECTED ON SAND CONCENTRATION, PARTICLE SIZE AND REQUIRED EFFICIENCY
• Cyclonic action separates the sand from the produced water
• Ceramic liners remove sand down to 15 micron
• Sand is removed from the vessel while still on-line
• Solids transferred to a ToreScrub, Sand bagging frame, mud skip or similar
ToreTrap
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A Condensate Flow Scheme
A Wells
B Wells
C Wells
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ToreScrubCleaning sand for discharge
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TorescrubCleaning the sand
One page technology description + picture• XXX
Diluted Slurry
Oily water
Feed waterSolids are re-circulated with
sand fluidising device
Eductor boosts the
pressure & dilutes
the slurry
before cleaning.
Cyclone scrubs solids & discharges
them to the vessel
Suction
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• Sand Production Prediction is unreliable– Comes with the water
– Completion failures
• 30 micron sand easy to remove, 10 micron sand expensive/difficult to remove
• Produced water solids are fouling– Clog filter cartridges
– Can’t use backwash filters
• Tie-ins, stimulation leading to solids
• Unnecessary Expense?– May not be needed for many years
– Need to be used regularly even when no sand
• Sand dewatering/cementing
• Water consumption
Challenges
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Bagging Frames and Containers
• Simple to complex
• Vessels to open bags
• Mud skips
• Builder’s bags
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Well Head Desanding
ADVANTAGES
• Eliminates Choke Wear and Flow Line
Problems
DISADVANTAGES
• Multi-Phase Flow – Higher Solids Cut Point
• High Pressure Design ($$$)
• One Well : One Desander
• Space and Weight