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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 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
Goals: • Design fractures that yield optimal production profiles • Optimal economic fracture conductivity and length • Include safety factor for uncertain matrix permeability • Post Fracture Analysis
Effect of Fracture Conductivity • No effect over 100 fold difference in Kf*H
Effect of Fracture Length • Large Influence – 0 versus 50 versus 100 feet
Effect of Under Designing Fracture in Good Perm. Area • Production losses smaller • For 600 versus 1200 foot fracture half length • Production acceleration reduced
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
History Match of Post Fracture Production • Include tubing curves to match tubing pressures • Needed because no bottom hole buildup data
History Match of Post Fracture Production • Match tubing pressures
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