Well No. | Underbalance interval m | Underbalanced drilling fluid density g/cm3 | Adjoining well conventional drilling fluid density g/cm3 | Coefficient of formation drillability
| Calculate multiples r | Adjoining well conventional actual drilling rate of penetration m/h | Under-balanced drilling the actual rate of penetration m/h | The actual ratio | Calculate multiples ratio and the actual error rate |
SongShen101# | 2974 - 3480 | 0.92 | 1.15 | 5.24 | 1.77 | 1.16 | 2.27 | 1.95 | 9.2% |
WeiShen5# | 3087 - 3610 | 0.94 | 1.15 | 5.16 | 1.78 | 1.25 | 2.46 | 1.97 | 9.6% |
WeiShen501# | 3098 - 3457 | 0.92 | 1.15 | 5.67 | 1.76 | 1.33 | 2.60 | 1.95 | 9.7% |
ZhaoShen11# | 3170 - 3410 | 0,93 | 1.10 | 5.48 | 1.80 | 1.02 | 1.92 | 1.91 | 5.8% |
XuShen1# | 3187 - 3960 | 0.94 | 1.12 | 5.84 | 1.78 | 1.56 | 2.88 | 1.84 | 3.3% |
XuShen3# | 3625 - 4763 | 0.92 | 1.10 | 6.23 | 1.81 | 1.14 | 1.95 | 1.71 | 5.9% |
XuShen5# | 3338 - 4057 | 0.92 | 1.15 | 5.89 | 1.77 | 1.04 | 1.88 | 1.82 | 2.7% |