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