Research Article
Modelling of Formation Pore Pressure Inversion during Tight Reservoir Drilling
Table 2
The inversion results of seven drilled gas-kick wells.
| | Well | Depth (m) | ROP (m/h) | Permeability (md) | Pit gain | True pore pressure (MPa) | Estimated pore pressure (MPa) | Relative errors | | Volume (m3) | Time (min) |
| | 1 | 4481.88 | 2.88 | 1.7 | 0.2 | 4.5 | 90.04-93.18 | 91.28 | ≤2.03% | | 2 | 4322.00 | 1.08 | 13.9 | 0.76 | 8 | 67.33 | 67.87 | 0.802% | | 3 | 4285.00 | 7.56 | 31.0 | 1.5 | 4 | 80.00 | 79.51 | 0.6125% | | 4 | 3573.01 | 4.32 | 100 | 1.64 | 6.5 | 64.68 | 64.33 | 0.541% | | 5 | 3999.00 | 4.68 | 25 | 1.07 | 4 | 78.51 | 79.07 | 0.713% | | 6 | 4544.55 | 6.84 | 18 | 0.45 | 7 | ≤82.39 | 83.11 | ≥0.874% | | 7 | 5524.81 | 8.64 | 69.4 | 1.37 | 11 | 64.80 | 64.57 | 0.355% |
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