EOR Produced Water Recycling. Derek Mandel Director of Technology, Flex EDR

Transcription

1 EOR Produced Water Recycling Derek Mandel Director of Technology, Flex EDR

2 Project Overview Reliable desalination of oil and gas produced water for reuse. Desalination saves chemical costs (Polymer), which pays for water treatment and yields 20% Return on Investment, improving EOR economics More water reuse Exceeded all metrics for capacity, economics, reliability and timeline Delivered 8 months ahead of schedule, treated more than 2 x the water planned Flex EDR pilot plant at Enerplus site in Medicine Hat, Alberta 2

3 Polymer Flood Enhance Oil Recovery (EOR) 3

4 Polymer Flood Enhance Oil Recovery (EOR) Polymer increases solution viscosity, extracting more oil Heavy oil (Alberta) requires higher viscosity = 2-3x more polymer than other regions Polymer costs can be very high ($2-10M/year for 1,000-4,000 m 3 /day site) POLYMER MAKEUP WATER OIL TDS: 5,000-15,000 mg/l POLYMER MIXING PRODUCED WATER RETURN INJECTION 4

5 Polymer Flood Enhance Oil Recovery (EOR) With Desalination Desalination offers: Reduced polymer consumption by ~50%, saving on chemical cost ($1M-$5M/y) Higher injectivity and reduced well scaling Reduced waste water volume ELECTRICAL POWER ACID (Carbonate Scale Risk MGMT) CIP CHEMICALS POLYMER MAKEUP WATER TDS: 5,000-15,000 mg/l PRE FILTRATION EDR TDS: mg/l 90% VOLUME POLYMER MIXING LOWER TDS REQUIRES LESS POLYMER OIL PRODUCED WATER RETURN EOR DESALINATION PLANT TDS: 60,000-70,000 mg/l 10% VOLUME INJECTION SALINE BRINE DISPOSAL 5

6 Electrodialysis Reversal (EDR) 6

7 Electrodialysis Reversal (EDR) Low pressure membrane system Low Cost ($2-6/m 3 ) Self Cleaning EDR Stack Target salt concertation can be tuned to desired concentration Animation: 7

8 Ion Flux: Ion Exchange Membranes Novel, highly cross-linked polymer composition improves resistance to oils, solvents and acids/bases. High selectivity to multivalent ions Membrane production Ionflux Ion Exchange Membrane 8

9 Flex EDR Field Pilot Medicine Hat, Alberta 9 8

10 Flex EDR Field Pilot Medicine Hat, Alberta Flex EDR Fit Pilot Operating Conditions Inlet TDS (Salt Concentration) Treatment Target TDS (Salt Concentration) 5,000-25,000 mg/l mg/l mg/l mg/l Recovery Chemistry dependent, typical 85-95% 90% Produced and Treated Water Oil in water concentration Tested up to 1000 ppm Not limited yet Ideally Remove >C ppm 10

11 Pilot Operating Conditions 2-5 m 3 /day (prefiltration capacity) 24/7 automated operation with self cleaning cycles Operated for 42 days, treating 150 m 3 >90% uptime System held under anaerobic conditions (Nitrogen blanket) 11

12 Viscosity (Cp) Pilot Results Desalinated produced water used less polymer to reach target viscosity The data suggests 50% polymer savings Polymer Concentration (ppm) Produced Water, 7139 mg/l TDS Treated Water, 1961 mg/l TDS Treated Water, 1741 mg/l TDS Makeup Water, 1045 mg/l TDS 12

13 Viscosity (Cp) Pilot Results Desalinated produced water used less polymer to reach target viscosity The data suggests 50% polymer savings. Cost of desalination is less than the polymer savings Polymer Concentration (ppm) Produced Water, 7139 mg/l TDS Treated Water, 1961 mg/l TDS Treated Water, 1741 mg/l TDS Polymer Savings Makeup Water, 1045 mg/l TDS 13

14 Challenges Filtration Field pilot produced water had very high oil-in-water More research required into reliable, reusable filtration. Extreme weather Blizzards and windstorms interrupted pilot operation 14

15 Keys to Success Alberta Innovates management of schedule and objectives drove project to completion Working with a right-size corporate partner to implement efficiently and drive innovation Off-site testing for better field pilot expectations and design Field pilot testing to experience real conditions 15

16 Thank you Treat the Toughest Water Saltworkstech.com 16