Table 1 Borehole layout data.
From: Investigation of change coal seam floor permeability based on pressurized water testing
Y1 | Y2 | |||||||
|---|---|---|---|---|---|---|---|---|
Cumulative drilling length | Inclination length | Vertical hole depth | Number of tests | Cumulative drilling length | Inclination length | Vertical hole depth | Number of tests | |
Coal No. 9 | 3.51 | 3.51 | 1.91 | 0 | 2.07 | 2.07 | 1.20 | 0 |
Carbonaceous mudstone | 10.41 | 6.90 | 3.76 | 2 | 5.57 | 3.50 | 2.03 | 2 |
Aluminum clay mudstone | 19.81 | 9.40 | 5.12 | 2 | 14.16 | 8.59 | 4.99 | 2 |
Fine sandstone | 37.71 | 17.90 | 9.75 | 5 | 39.46 | 25.30 | 14.69 | 6 |
Benxi limestone | 42.21 | 4.50 | 2.45 | 2 | 44.26 | 4.80 | 2.79 | 2 |
Coal No.10 | 43.02 | 0.81 | 0.44 | 1 | 45.05 | 0.79 | 0.46 | 1 |
Bauxite rock | 78.62 | 35.60 | 19.39 | 5 | 70.85 | 25.80 | 14.98 | 4 |
Ordovician limestone | 99.09 | 20.47 | 11.15 | 4 | 91.38 | 20.53 | 11.92 | 4 |
