sic membranes for produced water treatment case study 2
TRANSCRIPT
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SiC Membranes for Produced Water
Treatment:Case Study 2
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Challenge
• Discharge/Re-injection of Produced Water from oil production becoming difficult.• Oil wells maturing and water cut
increasing• Tighter government regulations
are being enforced for discharge of Produced Water.
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Our Solution
SiC Ceramic Membranes Used in a wide variety industrial settings and make the perfect candidate when dealing with oil separation given their oil repelling characteristics.
Unique hydrophilic properties leads to higher water fluxes -> continuous process flux for oil/water separation is between 200-2000 L/(m2*h)
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What can I remove?
• Oil • Grease• Iron• TSS (<10,000 mg/L)• Bacteria • Algae• Organic Matter
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Why SiC Membranes
• Oil repelling• Inert• Less Footprint• Longer lifetime• High Recovery• Self-cleaning
All this filtration can be accomplished in 1 single
step!
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Why SiC over traditional methods
POLYMERIC MEMBRANES ARE • Not as chemically or temperature resistant as not good (ecspecially at high temperatures of oil&gas industry)
• Handle oil very poorly Polymeric membranes are
• Expensive • Low water flux
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0.04 Micron 3,000 L/(m2hr)
4,000 L/(m2hr)
10,000 L/(m2hr)
>12,000 L/(m2hr)
FluxPore size
0.1 Microns
1 Microns
3 Microns
Filtration capability
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How it works
Feed flow is tangential to the surface of the membrane in order to sweep rejected particles and solutes away
CROSS FLOW FILTRATION
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Field Trial: Produced
Water Treatment for Re-Injection
Application: PW Treatment for re-injection at on-shore Colombian production site. Challenge: Field trial in order to evaluate performance and feasibility of SiC membranes for PW filtration prior to re-injection. Improved water quality for re-injection has significant effect on oil recovery, well, and equipment life time Current Treatment: Conventional setup of skim tanks -> micro-flotation -> walnut shell filtersFeedwater: OiW: 500 ppmTSS: 500 ppmRequirement: OiW: < 5 ppmTSS: < 5 ppm
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Field Trial: Conventional Technology
Issues
• Often not possible to meet permeate quality with current set-up ( Skim Tank + Micro-Flotation + Shell Filter)
• Quality dependent on correct dosage of chemicals (flocculants, demulsifiers, etc.)
• Difficult due to aging of walnut shell filters and feed composition variability
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Field Trial: Test Objectives
& Conditions
2 tests carried out to determine effectiveness of H2O Systems’ SiC membranes:
Test 1: Ultrafiltration before skim tank• SiC Ultrafiltration as a replacement for skim tank, microflotation and walnut shell filters.
• PW is supplied from surge/gun barrell tanks hich process oil/water mixture from oil wells
• High OiW and TSS content fluctuations in feed-water
Test 2: Ultrafiltration after skim tank• SiC Ultrafiltration as a replacement for microflotation and walnut shell filters.
• Pilot testing done on water after skimming tank
• Moderate OiW and TSS content fluctuations in feed-water
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Field Trial: Results
Test 1 (before skim tank):
Test 2 (after skim tank):
Operating Conditions:
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Field Trial: Results
Test 1: • For membrane operation prior to skim tank, significant OiW luctuations in feed
• Operating conditions changed depending on nature of feed water
• OiW and TSS in permeate < 5 ppmTest 2: • For membrane operation after skim tank, OiW fluctuations reduced
• SiC Membranes removed almost all of the oil and TSS
• 95% of the time, OiW < 1 ppm in permeate
Test 1: Feed (left) Permeate (right) Test 2: Feed (left) Permeate (right)
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Conclusion
• Field trial showed oil and TSS can be removed from PW regardless of feedwater oil conc.
• SiC membranes can replace conventional technologies with 1 step process (i.e. microflotation, walnut shell filters)
• Recommended that SiC membranes be used after skim tank -> buffers large conc. fluctuations and leads to higher oil recovery
• Continuous monitoring of OiW required to guarantee
optimal operation of SiC membranes.
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Next Steps• Meeting• Submit water analysis • Proposal and savings • Trial• Full systems intergration