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Smart Water for EOR by Membranes
PhD May 2015 – 2018 Supervisors: Prof. Torleiv Bilstad and Dr. Skule Strand
Myself
Membrane is a selective barrier separating ions
Feed SW Retentate
Permeate
Permeate
Cross Flow Membrane Separation
Low TDS Water + Chemicals
Smart Water Production Options
Nanofiltration membrane
Seawater as feed and (retentate) stream from membrane
Why NF for Smart Water
3000 NO
K
6500 NO
K
SO42- and Mg 2+ spiking effects on Cl⁻ and Na+ membrane separation
Cl- rejection decreased Na+ rejection decreased
Ion spiking of feed water
SO42- and PO4
2- spiking effects on Cl⁻ and Na+ separation
Very high solubility in seawater
Filtered SeawaterNF
RONF Permeate
NF Reject
RO Feed
RO Reject
RO Permeate
Smart Water
TDS = 10 000 – 28 000 ppm
Element ppmNa 10800Cl 19500Ca 400
Mg 1200SO4 2500TDS = 34400
Element ppmNa 9300Cl 16700Ca 350Mg 1000SO4 2400TDS = 29750
TDS < 500 ppm
Combination of NF and RO membrane for smart water production
Produced Water for Smart Water
Marathon oil, 1990, North SeaOffshore SR 90 membrane plant
Barium Scale in Oil Production
Ion rejection by NANO-BW-4040, NANO-SW-2540 and NF-270 (9 bar)
Results
0
10
20
30
40
50
60
70
80
90
100
Na Cl Ca Mg Ba
REJE
CTIO
N, %
LNANO-BW-4040 - 1:1.5 dilution NANO-SW-2540 - 1:3.5 dilution
Nutshell-Filter
Coalescer NF
NF/RO
Permeate
Retentate
Permeate
Retentate
Seawater
Diluted Brine for Re-
Injection
Re-use or Disposal
Produced Water Flow
Undesired increase of Na and Cl
Re-use or Disposal
Conclusions
No Excess Chemicals
Sulphate Substitution by Phosphate?
Energy Efficient
Produced Water Reuse
Fresh Water Saving
Sustainability