PRACTICAL COMPANION TO RESERVOIR STIMUU TION 700 600 1- ___I_= 500 h 400 v) a v Q Q -1 300 200 100 0 20 40 60 80 100 1 20 140 160 180 200 Ah (ft) Figure B-3-Net pressure for upward and downward fracture height migration for Example B-6. B-8