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Foam for mobility control in alkaline surfactant EOR process

Foam for mobility control in alkaline surfactant EOR process. Wei Yan George J. Hirasaki Clarence A. Miller. Outline. Bulk foam apparent viscosity in fractures Foam stability with the presence of residual oil Salinity and Calcium tolerance of NI blend

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Foam for mobility control in alkaline surfactant EOR process

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  1. Foam for mobility control in alkaline surfactant EOR process Wei Yan George J. Hirasaki Clarence A. Miller

  2. Outline • Bulk foam apparent viscosity in fractures • Foam stability with the presence of residual oil • Salinity and Calcium tolerance of NI blend • Alkaline-surfactant-polymer-foam flooding in vertical silicone sand pack

  3. Bulk foam at medium to low gas fractional flow Water

  4. Model for bulk foam apparent viscosity Crowding factor Viscosity of continuous phase Internal circulation factor Viscosity of dispersed phase

  5. Pal’s Model matches the experimental results for bulk foam apparent viscosity

  6. Short pack device for foam stability

  7. Foam stability test results

  8. 3 % surfactant + 1% Na2CO3 , 1 week 10 9 8 Phase boundary 7 Clear solution 6 2 clear phases % NaCl 5 Precipitate of surf. 4 Cloudy solution 1-Phase Region 3 * 2 * 1 * 0 * 1:1 4:1 9:1 IOS-15/18 N67-7PO S N67-7PO S:IOS-15/18 (w/w) NI Surfactant Blends Improve Salt Tolerance * Cloudy after 9 months.

  9. NI Surfactant Blends Improve Calcium Tolerance

  10. Experimerntal conditions for ASPF in sandpack

  11. Experimental procedure for ASPF flooding • Fill the sand pack with crude oil • Brine flood until no oil comes out • Na2CO3/NI-blend/Polymer flood for 0.5PV • IOS/Polymer flood for 0.2PV • Foam (fg = 0.67) flood as drive

  12. ASP Experiment in 40 darcy vertical silica sandpack

  13. Effluents for different pore volume for ASPF experiment

  14. Conclusions • Bulk foam apparent viscosity at medium to low gas fractional flow can be described by semi-empirical model. • IOS is a good foamer with the presence of residual crude oil • NI blend can improve the surfactant’s tolerance to calcium and salinity • Foam drive can be used to replace polymer drive in alkaline-surfactant-polymer process

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