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Hydraulic Fracture Optimization Study

Hydraulic Fracture Optimization Study. Goals: Understand relationships between fracture design and economics: History match previous fractured wells understand field wide matrix permeabilities and fracture lengths Understand importance of dimensionless conductivity

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Hydraulic Fracture Optimization Study

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  1. Hydraulic Fracture Optimization Study Goals: • Understand relationships between fracture design and economics: • History match previous fractured wells • understand field wide matrix permeabilities and fracture lengths • Understand importance of dimensionless conductivity • Fracture conductivity - variable • Fracture length

  2. Goals: • Design fractures that yield optimal production profiles • Optimal economic fracture conductivity and length • Include safety factor for uncertain matrix permeability • Post Fracture Analysis

  3. 350 Acre Single Well Hydraulic Fracture Grid

  4. Pressure Profile For 50 foot Hydraulic Fracture

  5. Effect of Fracture Conductivity • No effect over 100 fold difference in Kf*H

  6. Effect of Fracture Length • Large Influence – 0 versus 50 versus 100 feet

  7. Effect of Under Designing Fracture in Good Perm. Area • Production losses smaller • For 600 versus 1200 foot fracture half length • Production acceleration reduced

  8. Effect of Under Designing Fracture in Low Perm. Area • Production losses larger • For 600 versus 1200 foot fracture half length • 20% lost reserves at year 5 • Production acceleration greatly reduced

  9. History Match of Post Fracture Production • Include tubing curves to match tubing pressures • Needed because no bottom hole buildup data

  10. History Match of Post Fracture Production • Match tubing pressures

  11. Predictive runs - 17- 20% recovery factor in 10 years

  12. Hydraulic Fracture Optimization Study Conclusions • Fracture conductivity not important • Fracture length critical to design • Fracture length should be overdesigned unless matrix perm known with certainty because: • Production acceleration losses are large • Reserves lost – 20% over 5 years

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