This must the discovery of the decade. Walnut shells are used to purify water from any sort of Contamination and has been a blessing for the Oil & Gas Sector.
4. Slide4
Water Technologies
Produced
Water
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
5. Slide5
Water Technologies
Separation Technology Spectrum
10,0001,000100101
Oil in Water Concentration (ppm)
Efficiency
API
CPI
DAF, IGF, DGF
Hydrocyclone
Centrifuge
Membrane
Walnut Shell and
Coalescing Filters
1º
2º
3º
6. Slide6
Water Technologies
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
7. Slide7
Water Technologies
The Siemens Walnut Shell Filter Media
The Black Walnut Shell
Excellent surface characteristics for
Coalescence
Filtration
High “modulus of elasticity”
Chemical free oil separation
9. Slide9
Water Technologies
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
16. Slide16
Water Technologies
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
19. Slide19
Water Technologies
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
ForwardFlowUsedfor
Backwash(%)
20. Slide20
Water Technologies
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
21. Slide21
Water Technologies
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