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Update on Surfactant EOR in Fractured, Oil-Wet Carbonates

Update on Surfactant EOR in Fractured, Oil-Wet Carbonates. D. Leslie Zhang 06 / 04 /05 UT, Austin. Outline. Problems with the old blend – TDA-4PO S : CS-330 =1:1 Introduction of the new blend – N67-7PO S : IOS1518 = 4:1. Phase Behavior IFT Adsorption

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Update on Surfactant EOR in Fractured, Oil-Wet Carbonates

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  1. Update on Surfactant EOR in Fractured, Oil-Wet Carbonates D. Leslie Zhang 06/04/05 UT, Austin

  2. Outline • Problems with the old blend – TDA-4PO S : CS-330 =1:1 • Introduction of the new blend – N67-7PO S : IOS1518 = 4:1 • Phase Behavior • IFT • Adsorption • Oil recovery by centrifuge imbibition

  3. WOR=1 WOR=10 WOR=3 Soap/Synthetic Surfactant Mole Ratio Correlation Acid number of crude oil:0.2 KOH mg/g oil 14 TC Blend: TDA-4PO S/CS-330=1:1 12 10 8 Optimal NaCl Conc., % 6 4 2 Formation brine salinity 0 1E-02 1E-01 1E+00 1E+01 Soap/Synthetic Surfactant Mole Ratio

  4. 0.05% TC Blend / 1%Na2CO3 / NaCl @ WOR=10:1 (27 weeks after settling at 30 °C in the environmental room) 2 4 6 6.2 6.4 6.6 6.8 7 7.2 7.4 7.6 7.8 8 9 %

  5. 3% TC Blend/1%Na2CO3/NaCl (7 weeks after settling at 30 C in the environmental room) 0 2 5 7 9 10 11 12 13 14 15 16 Gel/viscous emulsion

  6. In 1% Na2CO3 / x%NaCl, WOR=3:1, Room Temperature X= 4 5 5.2 5.4 5.6 5.8 6 7 Settling time: 4 months Abe et al, JCIS 114 (2), 1986 (2.4%)N67-7PO S + (0.6%)IOS-15/18

  7. (0.04%)N67-7PO S + (0.01%)IOS-15/18 In 1% Na2CO3 / x%NaCl, WOR=3:1, Room Temperature X= 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 3.0 Settling time: 7 days Settling time: 1 month

  8. Soap/Synthetic Surfactant Mole Ratio Correlation Acid number of crude oil:0.2 KOH mg/g oil 14 12 TDA-4PO S : CS-330=1:1 10 8 Optimal NaCl Conc., % 6 N67-7PO S : IOS-1518=4:1 4 2 Formation brine salinity 0 1E-02 1E-01 1E+00 1E+01 Soap/Synthetic Surfactant Mole Ratio

  9. 10 9 2-Phase Region 8 7 6 5 Salinity of Phase Separation, % 1-Phase Region 4 3 2 1 0 1:1 4:1 9:1 IOS-15/18 N67-7PO S N67-7PO:IOS-15/18 (w/w) Surfactant Solution Should Be Single Phase At Injected Composition

  10. 7-19 days settling 26 days settling IFT of (0.04%)N67-7PO S + (0.01%)IOS-15/18 In 1% Na2CO3 / x%NaCl, WOR=3:1, Room Temperature 1E+01 1E+00 IFT, dyne/cm 1E-01 1E-02 1E-03 0 1 2 NaCl, %

  11. 0.1% new blend 0.05% new blend 0.05% new blend/1% Na2CO3 Adsorption of (N67-7PO S : IOS-15/18 = 4:1) on Calcite 2.5 2 1.5 Adsorption, mg/m2 1 BET surface area of the calcite: 17.851 m2/g 0.5 0 0.00 0.50 1.00 1.50 2.00 Residual Surf Conc, mmol/l 0.1% new blend/1% Na2CO3

  12. Core Schematic Setup for Imbibition in Centrifuge x x x x x x x x x x x x x Brine or Surf. Sol. Stainless Screen rotor

  13. Oil Recovery by Imbibition in Centrifuge Aged at 80C for 48 hours RPM=6000, centrifuge time=4days

  14. Not aged Aged at 80 C Waterflood Oil Recovery by Centrifuge Imbibition 0.05% NewBlend/1%Na2CO3/x%NaCl 80 75 Oil Recovery 70 65 60 1 2 3 4 5 NaCl, %

  15. NB Why and When Surfactant Improves Oil Recovery At 6000 RPM Ref: Lake, 1989 (Camilleri, 1983)

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