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Well Completion Design for Tight-Gas Formations M. Y. Soliman, PhD

Well Completion Design for Tight-Gas Formations M. Y. Soliman, PhD. September 20, 2006 Mendoza, Argentina. Completion of Tight gas sand. Various completion options Fluid Flow GeoMechanics. Successful Completion Optimization. Set up realistic expectations

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Well Completion Design for Tight-Gas Formations M. Y. Soliman, PhD

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  1. Well Completion Design for Tight-Gas FormationsM. Y. Soliman, PhD September 20, 2006 Mendoza, Argentina presentation to Repsol by MYS on 9/13/06

  2. Completion of Tight gas sand • Various completion options • Fluid Flow • GeoMechanics presentation to Repsol by MYS on 9/13/06

  3. presentation to Repsol by MYS on 9/13/06

  4. Successful Completion Optimization • Set up realistic expectations • Consider various completion options presentation to Repsol by MYS on 9/13/06

  5. Successful Completion Optimization • Set up realistic expectations • Reservoir Characterization • Well tests, Logging, and core data • production analysis of offset well • Stress field • Understanding of reservoir fluid properties • Realistic modeling presentation to Repsol by MYS on 9/13/06

  6. Successful Completion Optimization • Optimize completion • Various completion strategy • Set optimization criterion or criteria • Define parameters that affect the optimum design • Fracture geometry, conductivity, height • Reservoir properties • Realistic modeling presentation to Repsol by MYS on 9/13/06

  7. Some of the Possible completion types • Vertical well • Fractured vertical well • MLT • Radially distributed, kicked off in the middle of the formation • Vertical distribution • Fractured horizontal well presentation to Repsol by MYS on 9/13/06

  8. presentation to Repsol by MYS on 9/13/06

  9. presentation to Repsol by MYS on 9/13/06

  10. Investigated properties • Permeability 0.005, 0.05, 0.1 md • Height 400 ft, also looked at 100 and 20 ft • Pressure 4000 psi • Fracture Parameters • half length 400 ft, Conductivity, 1750 md-ft • MLT • 6 arms 550 ft each + the vertical well • Horizontal well, • 1320 ft • Four fractures presentation to Repsol by MYS on 9/13/06

  11. Effect of completion type presentation to Repsol by MYS on 9/13/06

  12. Effect of completion type presentation to Repsol by MYS on 9/13/06

  13. Effect of completion type presentation to Repsol by MYS on 9/13/06

  14. Vertical Well Pressure Distribution presentation to Repsol by MYS on 9/13/06

  15. Fractured Vertical Well pressure Distribution presentation to Repsol by MYS on 9/13/06

  16. MLT pressure Distribution presentation to Repsol by MYS on 9/13/06

  17. Cross section presentation to Repsol by MYS on 9/13/06

  18. Frac HW pressure Distribution presentation to Repsol by MYS on 9/13/06

  19. Refrac and multiple Fractures • One fracture • Two perpendicular fractures • Multiple fractures. presentation to Repsol by MYS on 9/13/06

  20. presentation to Repsol by MYS on 9/13/06

  21. One-Frac case presentation to Repsol by MYS on 9/13/06

  22. Two-Frac case presentation to Repsol by MYS on 9/13/06

  23. GeoMechanics effect • Depletion • Stress interference presentation to Repsol by MYS on 9/13/06

  24. Effect of pressure dependant permeability and porosity presentation to Repsol by MYS on 9/13/06

  25. Stress Interference in Fractured Horizontal Well presentation to Repsol by MYS on 9/13/06

  26. Annulus Pressure, Tubing Rate, & Annulus Rate A C Annulus Pressure (psi) A Slurry Rate (bpm) C Flowback Rate (bpm) C 3000 40 35 2500 30 2000 25 1500 20 (psi) (bpm) 15 1000 10 500 5 0 0 09:00 10:00 11:00 12:00 13:00 14:00 15:00 16:00 17:00 18:00 7/10/2003 7/10/2003 Time presentation to Repsol by MYS on 9/13/06

  27. Conclusions • The lower the permeability, the more attractive fracturing. • Fracturing horizontal wells is the most promising technique in thick, tight gas formations. • The geomechanics effect on complex reservoir performance should always be considered, especially when creating multiple fractures in horizontal wells • Multiple fracturing from a wellbore is a fast growing area of technology presentation to Repsol by MYS on 9/13/06

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