Download - Walnut Shell Filters - Oil & Gas
Water Technologies
Walnut Shell Filters
Siemens Water Technologies
Redesigning for Offshore Use
Michael Howdeshell
Chad Felch
Eric Lorge
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Geography
-Siemens
-O&G offices
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Agenda
Walnut Shell Technology Background
Testing in North Sea
Taking Walnut Shell Technology Off-Shore
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ProducedWater
Water Treatment in Oil Field Industry
Tertiary Separation
Walnut shell filter
Coalescing filter
Cartridge filter
Sand filter
Secondary Separation
Dissolved Air Flotation (DAF)
Dissolved Gas Flotation (DGF)
Induced Gas Flotation (IGF)
Primary Separation
Hydrocyclone
API Separator
Plate Separator
Skimmer
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Separation Technology Spectrum
10,0001,000100101
Oil in Water Concentration (ppm)
Eff
icie
ncy
API
CPI
DAF, IGF, DGF
Hydrocyclone
Centrifuge
Membrane
Walnut Shell and
Coalescing Filters
1º
2º
3º
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How Do Walnut Shell Filters Work
Continuous pressurized media bed
Bed(s) cycle based on time or ΔP
Media is recharged using backwash cycles
Oil is adsorbed not absorbed
Used to removed SS and free oil
Walnut shell media have an equal affinity for oil and water
Very low attrition rate
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The Siemens Walnut Shell Filter Media
The Black Walnut Shell
Excellent surface characteristics for
Coalescence
Filtration
High “modulus of elasticity”
Chemical free oil separation
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Walnut Shell Global Usage
- Installation
- Void regions
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Pilot Testing – BP Valhall Platform
Objectives
Prove walnut shell media can handle North Sea produced water
Test efficiency of system
Suitable for off-shore?
Stavanger
Bergen
Oslo
BP Valhall
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Pilot Unit Used on BP Valhall Platform
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Walnut Shell Media Close-ups
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Backwash Procedure Used in Test
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Results from Pilot Testing
*
* Measurements conducted with TD500 OiW analyzer
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Results from Pilot Testing –
Inlet and Effluent Oil Concentrations
45
50
55
60
65
70
8/21/2008 8/22/2008 8/23/2008 8/24/2008 8/25/2008 8/26/2008
Inle
t o
il (
pp
m)
0
1
2
3
4
5
Eff
lue
nt
oil
(p
pm
)
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Results from Pilot Testing –
Oil Removal Efficiency
80
82
84
86
88
90
92
94
96
98
100
8/22/2008 8/23/2008 8/24/2008 8/25/2008
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Moving from On-Shore to Off-Shore
Demonstration Objectives
Prove walnut shell media can handle North Sea produced water
Test efficiency of system
Suitable for off-shore use?
Off-shore challenges
Footprint and weight reduction
Simplify and optimize backwash system
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Moving from On-Shore to Off-Shore
Tasks
Reduce external scrubbing
Increase throughput
Reduce backwash water volume
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Siemens Internal Backwash
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Improvements for Off-Shore
Complete turn over and mixing of the media
Fully fluidize the walnut shell bed
No rotating equipment or moving parts
The ability to use a finer walnut shell media to improve oil and solids removal
Smaller footprint and weight
A reduction in backwash water volume
0.72%0.35%
5%
Sand Filter Old WSF New WSF
Fo
rwa
rd F
low
Us
ed
fo
r
Ba
ck
wa
sh
(%
)
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The Siemens Walnut Shell Filter
Design Considerations
Ready for off-shore use
Refinement of the design through many years of successfully commissioned installations, most of which still in operation today
Direct experience of many applications for which walnut shell filters can be appropriate
No compromise of design to ensure effluent quality is maintained
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Summary
Walnut Shell Media
Efficiently remove oil from North Sea produced water
Solids do not impact the efficiency
Suitable for off-shore use
Walnut Shell System
Reduced footprint through efficient backwash design and finer shell media
Reduced weight
Reduced backwash water volume
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Thank you for your attention!