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Simple, Fast and Accurate Solvent-free Method for Produced Water Process Monitoring.

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Presentation on theme: "Simple, Fast and Accurate Solvent-free Method for Produced Water Process Monitoring."— Presentation transcript:

1 Simple, Fast and Accurate Solvent-free Method for Produced Water Process Monitoring

2 What is produced water? Water that comes to the surface with oil and gas Contains many chemical constituents – Salt content (salinity, total dissolved solids, electrical conductivity) – Oil and grease Composite of many hydrocarbons and other organic materials – Toxics from various natural inorganic and organic compounds or chemical additives – NORM – Some oxygen demanding materials

3 U.S Oil and grease limit used as a “surrogate” for other pollutants – When oil and grease are controlled, other pollutants will also be controlled Limit is based on a statistical analysis of data from 60 U.S. platforms – Monthly average = 95th percentile = 29 mg/l – Daily maximum = 99th percentile = 42 mg/l Limits based on the Freon Extraction method

4 Method comparison Old protocol –IR Technique –Freon extraction – kept light ends D

5 Method comparison New Technique – EPA 1664 –Hexane extraction –Distill off the hexane Loss of light ends –Weigh the residue Hexane

6 A2 Test Methodology Filter water through a PTFE filter Mass loading Highly efficient Even distribution Quick drying

7 Filter Method Analysis time– 30 seconds No solvents Easy disposal Easy cleanup D

8 PAL Spectrometer

9 1. Place Sample on window 3. Analyze the sample 2. Rotate TumblIR into place 4. Cleaning is easy! No Sample Prep Required, No Training Required

10 Why FT-IR for Lubrication Analysis? Water Additive depletion –Antioxidant Phenolic Aminic EP/AW Oxidation Nitration –Varnish formation

11 IR Detector Scatter Large droplets => IR scattered A IR Detector Small droplets => IR absorbedB Water in oil Before surfactant

12 A B Surfactant effect Minimizes transfer loss from container to container Ensures consistency in amount of oil measured Before After

13 Absorbance Absorbance Before surfactant After surfactant Surfactant Effect

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15 Gravimetrically Prepared Oil in Water Standards Used for FT- IR Calibration and Method Development 1.Oil dilution standards gravimetrically prepared in IPA 2.Appropriate volumes added to a thoroughly cleaned 1000mL volumetric flask 3.The IPA solvent is evaporated at 50°C under vacuum 4.Dried flask is filled to the mark with distilled water 5.250uL of Oil Stabilizer additive is added 6.Sample is vigorously shaken by inversion for 1-2min 7.Transfer solution to cleaned 1L sample jar, shaking the flask vigorously after ¾ of the solution is transferred

16 Methodology

17 Filter

18 FT-IR Spectrum of Mineral Oil

19 Wavenumber Absorbance

20 Actual Concentration Predicted Concentration R 2 =0.9957

21 Actual Concentration Predicted Concentration R 2 =0.9957

22 The limit of detection for this method is 0.10ppm (100ppb)

23 Wavenumber Absorbance

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25 Additional capabilities Water in crude oil –0.1 – 0.3% level –Keeps pipes from corroding Water in crude oil –1% – 50% –Allows dewatering/production validation etc Water/Glycol mix analysis –Drilling fluid

26 Conclusions


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