SPE MS Reuse of Produced Water by Membranes for Enhanced Oil Recovery

Transcription

1 Slide 1 SPE MS Reuse of Produced Water by Membranes for Enhanced Oil Recovery Remya Ravindran Nair, Evgenia Protasova, Skule Strand, Torleiv Bilstad University of Stavanger, Norway

2 OBJECTIVES Slide 2 Waterflooding Water Treatment

3 SMART WATER IN CHALK RESERVOIRS Slide 3 Manipulation of ions in Seawater or Produced Water Improves oil recovery by altering wettability High divalent and low monovalent ions Wettability alteration by Smart water injection

4 SMART WATER IN CHALK RESERVOIRS Slide 4 Suggested mechanism for wettability alteration by SW (Austad, 2012)

5 PRODUCED WATER(PW) Slide 5 3 barrels of water with every barrel of oil (Ref. Halliburton) Major components - Dissolved and dispersed oil - Dissolved formation minerals - Naturally occurring radioactive materials (NORM) - Chemicals added during oil production - Dissolved gases - Water Discharge standard in Norway - 30 mg/l

6 Million Standard Cubic Meter 200 PRODUCED WATER MANAGEMENT ON NCS Slide Water volume to the sea Produced Water injected Norsk Oil and Gas, Environmental report, 2016

7 SMART WATER FROM PW IN CHALK RESERVOIRS Slide 7 Spontaneous imbibition of mixtures of PW and SSW into chalk cores (Puntervold, 2008)

8 MAJOR CHALLENGES Slide 8 Oil Content Scaling High TDS

9 PRETREATMENT OF SYNTHETIC PRODUCED WATER Slide 9 Dual media filtration unit Activated Carbon Anthracite

10 PRETREATMENT OF SYNTHETIC PRODUCED WATER Slide 10 Synthetic PW produced by mixing 0.1, 0.2, 0.3, 1, 2 and 3 ml of Ekofisk oil / L of SW at rpm Comparison of influent and effluent samples

11 MAJOR CHALLENGES Slide 11 Scaling High TDS

12 CROSSFLOW MEMBRANE SEPARATION Slide 12 Membrane - Selective barrier separating ions NF feed pressure 3-15 bar NF pore size nm NF retains divalent ions PW feed up to 40,000 ppm can be used without dilution. Feed SW Permeate Permeate Retentate Membrane separation

13 THIN FILM COMPOSITE MEMBRANES Slide 13 <1 mm Poly amide Coating 50 mm Polysulphone porous layer 100 µm Non-woven poly ester support fabric

14 PRETREATMENT OF SW UPSTREAM OF WATER INJECTION ON BRAE ALPHA PLATFORM Slide 14

15 Feed Synthetic PW Dilution 1:1.5 NANO-BW EM-NF Slide 15 Dilution 1:3.5 EM-NF NANO-SW IC Analysis NF

16 BARIUM ION SEPARATION WITH NF MEMBRANES Slide 16 Composition similar to Tor Field in North Sea Barium ion concentration increased to 200 mg/l Rejection % by NANO-BW-4040, NANO-SW-2540 and NF at 9 bar

17 RECOVERY - NF MEMBRANES Slide 17 Recovery varies with membranes Proper membrane selection is a challenge Recovery by two different membranes

18 POWER CONSUMPTION Slide 18 Power required for PW treatment by NF Power required for SW treatment by NF Total power consumption Power consumed for smart water production Cost / NF membrane Cost / RO membrane 1.35 kw kw kw 0.37 kwh/m USD 650 USD

19 CONCLUSIONS Slide 19 Environment friendly production of Smart water with NF Hydrocarbon removal efficiency of 96 % by dual media filtration 80% barium ion removed from PW by NF membranes Focus is on selection of suitable NF membrane with higher permeate recovery to increase efficiency of the presented model.

20 Slide 20 Acknowledgements The authors would like to acknowledge the Research Council of Norway, the National IOR Centre of Norway and the University of Stavanger for financial support.