Treatment for Blended Produced and Fresh/Brackish Water

Transcription

1 Treatment for Blended Produced and Fresh/Brackish Water

2 Produced Water Cycle Wellhead to Injection Well Well Pad Salt Water Disposal Gathering System Chemical Treatment Tank Battery Biocide Oil/Water Separation

3 Typically placed prior to gun barrels to prevent bacteria and provide iron control

4 Produced Water Cycle Wellhead to Reuse Well Pad Produced Water Pit Gathering System Tank Battery Oil/Water Separation

5 Produced Water Options Where are you getting your Produced Water Tank Battery Gun Barrel OWS Produced Water from tank batteries can have higher oil, iron and solids. Must consider this if recycling from this point Produced Water from Gun Barrels is generally better quality. Low oil, low solids and if oxidation is being used for bacteria control, low iron

6 Produced Water Options Typical Reuse Model Tank Battery Gun Barrel OWS

7 Produced Water Options Typical Reuse Model w/aeration Tank Battery Gun Barrel OWS

8 Aeration Background Air Driven Submersible or Floating Submersible better for oxidation and solids control Submersible include bubble tubing and diffuser type systems Floating only aerates the top few feet, leaving the remaining water to foul and bacteria to grow Systems must be sized based on water quality and oxygen demand Submersible Floating

9 Aeration: Produced Water Aeration Benefits Bacterial Control/Growth Inhibition Algae Control/Growth Inhibition Iron Control Sulfide Control Stratification Control Icing Inhibition Mixing / Homogenization Low Cost

10 Aeration: Produced Water

11 Produced Water Pit Mixing w/aeration Improved Water Quality 24 hour Pit Mixer Comparison % Reduction 99.7% Reduction 79% Reduction Total Fe Fe2+ Tannins ORP Reserve Pit Active Pit Parameters Active Pit with Mixing / Aeration Reserve Pit without Mixing / Aeration Pit Volume, bbl 100,000 15,000 ORP, mv Total Fe, mg/l Fe 2+, mg/l Tannins, mg/l

12 Case Study : What Aeration Does ATP over time ATP, pg/ml % Reduction % % ATP, pg/ml % 40% 20% % Reduction Day 0%

13 Produced Water Reuse Requirements What Are Your Goals Constituent Slickwater Guar (Linear) Guar (XL) Hybrids (XL) Chlorides (ppm) 140K (anionic) No Limit (cationic) 60K 60K 60K Total Hardness (ppm) 50K 20K 20K 20K Iron (ppm) Oil (ppm) TSS (ppm) Boron (ppm) No Limit No Limit Bacteria (cfu/ml)

14 Water Treatment Requirements Slickwater Fracs Bacteria Control Primary Solids Control Tertiary Primary Iron & Sulfide Control Secondary Scale Inhibition Bacteria causes corrosion, plugging/fouling and generation of hydrogen sulfide Iron can cause formation damage and Sulfides form dangerous gases Solids can cause formation damage and contribute to plugging/fouling Scale can cause plugging/fouling, and contribute to underlayment corrosion

15 Water Treatment Requirements Conventional Treatment Program Blend Disinfection Pre-Treatment Fresh/Brackish Water Produced Water Pre-treatment TDS Removal (Softening) Floc and drop EC

16 Water Treatment Requirements Conventional Treatment Program Blend for Scale Inhibition/Add Scale Inhibitor Disinfection Fresh/Brackish Water Produced Water

17 Water Treatment Requirements Slickwater Fracs Bacteria Control Solids Control Secondary Primary Iron & Sulfide Control Primary Solids can cause formation damage and contribute to plugging/fouling Bacteria causes corrosion, plugging/fouling and generation of hydrogen sulfide Iron can cause formation damage and Sulfides form dangerous gases

18 The Hydrozonix Difference Identify right micron size to satisfy your goal Field evaluations and size distribution are performed to identify micron size performance Nominal vs. Absolute Percentage 120.0% 100.0% 80.0% 60.0% 40.0% 20.0% 0.0% Particle Size Distibution for Produced Water Samples 0.0% 0.0% 0.0% 0.0% 84.2% 97.9% Bag Filtration TSS Control Reduces bacteria and iron Provides algae control Must be applied correclty 5.4% 9.3% 0.7% 1.0% 0.8% 0.6% > < 0.45 Particle Size, µm

19 Prodcued Water Reuse Cycle Slickwater Fracs Wellhead Frac Reuse Oil/Water Separation On the Fly Disinfection Gathering System Produced Water Pit

20 Prodcued Water Reuse Cycle Slickwater Fracs Wellhead Frac Reuse Oil/Water Separation On the Fly Disinfection Gathering System Produced Water Pit AERATION

21 Produced Water Management for Reuse HYDRO 3 CIDE Bacteria, Iron & Sulfide Control Bacteria 90% Iron 90% Sulfides 90% Aerating Mixer Bacteria, Iron, Sulfide & Solids Control Bacteria 70% Iron 90% Sulfides 80% On-the-Fly Bacteria, Iron & Sulfide Control Bacteria 90% Iron 90% Sulfides 90%

22 Water Treatment Requirements Conventional Treatment Program Blend for Scale Inhibition/Add Scale Inhibitor Disinfection Fresh/Brackish Water Produced Water

23 Blend Control No Control Fresh Water, BBL Produced Water, BBL % of Produced 80% 70% % Water Volume, BBL % 40% 30% % of Produced Fluid % % Stage # 0% Volume of Fresh Water and Produced Fluid Treated at Different Stages

24 Blend Control TDS & Blend Ratio 7000 TDS in the Treated Water, mg/l Stage # 80% Water Volume, BBL Fresh Water, BBL Produced Water, BBL % of Produced Stage # 70% 60% 50% 40% 30% 20% 10% 0% % of Produced Fluid

25 Produced Water Stratification Pit Stratification A static, unmixed pit will stratify Chlorides will increase with depth Temperature will decrease with depth Zones are created at different depths with changing water quality Chlorides Increase Temperature Increases

26 Produced Water Pit Mixing Continuous TDS Monitoring: Baseline shows stratification Mixing Start Well - Mixed Point Surface TDS, mg/l Middle Bottom Baseline Time

27 Produced Water Pit Mixing w/aeration Continuous Temperature Measurement: 3 zones monitored Mixing Start Well-Mixed Point Mixing Stop A - Surface B - Surface C - Surface Water Temperature, F Baseline A - Middle B - Middle C - Middle A - Bottom B - Bottom C - Bottom Ambient Ambient Temperature, F Time

28 Blend Control Keep Blend Ratio Consistent with TDS/Chloride Real Time Monitoring KCl Equivalent Produced Water Treated Water 8.0% 7.0% % Monitor Chlorides and TDS To Monitor Blend For KCl equivalency Chloride, mg/l % 4.0% 3.0% 2.0% KCl Equivalent of the Treated Water % 0 Pre % Stage Number 28

29 Solution Keep Blend Ratio Consistent Calibrate Pumps Water Volume, bbl Fresh Water Produced Water % of Produced Fluid 50.0% 45.0% 40.0% 35.0% 30.0% 25.0% 20.0% 15.0% 10.0% 5.0% Monitor TDS Real Time 0 Pre Stage Number 0.0% Adjust Blend Ratio Influent Effluent Prevent Friction Reducer Compatibility Issues TDS, mg/l Stage Number 29

30 Solids Control Filtration No what micron size you need. Pretreatment HYDRO 3 CIDE Bacteria, Iron & Sulfide Control Basics of Produced Water Reuse Pit Treatment Aeration Bacteria, Iron & Sulfide Control On-the-Fly Bacteria Control Bacteria, Iron & Sulfide Control w/ Ozone Water Quality Assurance Real Time Critical to a successful program & Blend Control Five Principal Requirements HYDRO 3 CIDE Aerating Mixers EF80 Ozone based treatment Summary Optimize your chemical program in your gathering system. Use aeration to preserve your water quality. Simplify your On-the-Fly disinfection program. Monitor compatability and disinfection real time.

31 Questions?