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