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H. Sidiq, A. Al-bari, R. Amin September 2009

The Impact of SCCO 2 Injection Rate on Recovery efficiency from Gas- Condensate Reservoirs: Laboratory Investigation. H. Sidiq, A. Al-bari, R. Amin September 2009. IEA EOR Conference in Canberra 2009. Presentation Outline. Purpose Introduction Experimental Work Results and Discussion

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H. Sidiq, A. Al-bari, R. Amin September 2009

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  1. The Impact of SCCO2 Injection Rate on Recovery efficiency from Gas- Condensate Reservoirs: Laboratory Investigation H. Sidiq, A. Al-bari, R. Amin September 2009 IEA EOR Conference in Canberra 2009

  2. Presentation Outline • Purpose • Introduction • Experimental Work • Results and Discussion • Conclusions

  3. Purpose To investigate the velocity-dependent relative permeability (VDRP), molecular diffusion and dispersion mechanisms on recovery efficiency from gas-condensate reservoirs.

  4. Introduction • The CO2 associated with natural gas production can be re-injected for enhanced gas-condensate recovery as well as to overcome the problems associated with gas condensation near the production wells. • CO2 injection for enhanced EOR comes as second methods and approximately 300,000 barral/day produced by means of CO2 injection. • SCCO2 is a promising technology that provides mutual benefits for coupled increased productivity and CO2 sequestration.

  5. Experimental Work • Unsteady state design. • Flow rates: 1, 2, 5, 7 and 10 cm/hr equivalent to approx. 0.8, 1.6, 4, 5.5 and 8 ft/day respectively. • Flooding pressure: 5900 psi Table 1: Cores petrophysical characteristics

  6. Experimental Work…cont Fig 1: HPHT Coreflooding Schematic Test sequence: 1-Saturating the Cores with brine measuring, Kw. 2-Flooding the Cores with methane or condensate to Swi and measuring Kge@Swi. 3-Displacing methane or condensate by SCCO2 at different injection rates measuring methane-CO2 and condenstate-CO2 relperm.

  7. Results and Discussion 1-SCO2-Condensate

  8. SCCO2-Condensate Displacements Figure 2: Condensate Recovery vs. PVI

  9. SCCO2-Condensate Displacements…cont Figure 3: Mole % CO2 Production vs. PVI

  10. SCCO2-Condensate Displacements…cont * BT simulation images of air (black) penetrating water (Crandall 2007) A Microscopic Look! 5 cm/s* 1 cm/s*

  11. Swi SCCO2-Condensate Displacements…cont Figure 5: SCCO2 and Condensate Relative Permeability vs. Total Liquid Saturation

  12. Results and Discussion 2-SCO2-Methane

  13. SCCO2-Methane Displacements Figure 6: Mole % CO2 Production vs. PVI

  14. SCCO2-Methane Displacements…cont Figure 7: SCCO2 and Methane Relative Permeability vs. CO2 Saturation at 10 cm/hr

  15. SCCO2-Methane Displacements…cont Figure 8: SCCO2 and Methane Relative Permeability vs. CO2 Saturation at 1 cm/hr

  16. Conclusions • The rate-sensitivity of natural gas and condensate recovery following SCCO2 injection was investigated. • This study showed CO2 injection rate (velocity) greatly affects the displacement efficiency with it the amounts of CO2 sequestered. • In condensate-SCCO2 system improved recovery efficiency achieved with decreasing displacement rate. • Methane recovery factor at CO2 breakthrough confirmed that recovery factor increased as injection rate increased until a maximum recovery factor obtained at corresponding field injection rates of 10cm/h

  17. Thank you Questions?

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