Research Article
Study and Verification of a Physical Simulation System for Formation Pressure Testing while Drilling
Table 3
Explained results of formation pressure.
| | Number | Parameters | Number 1 | Number 2 |
| | 1 | Lithology | Coarse siltstone | Fine siltstone | | 2 | Permeability (mD) | 105.2 | 10.2 | | 3 | Confining pressure (psi) | 4500 | 4500 | | 4 | Annular pressure (psi) | 3900 | 3900 | | 5 | Formation pressure (psi) | 3000 | 3000 | | 6 | Pressure drop time (/s) | 5.0 | 5.0 | | 7 | Withdrawn flow rate (/(ml/s)) | 1.5 | 0.5 | | 8 | Explained results using the present system (psi) | 2895.12 | 2873.22 | | 9 | Absolute error (psi) | −4.88 | −26.78 | | 10 | Relative error (%) | −0.17 | −0.92 | | 11 | Explained results using the previous system (psi) | 2849.23 | 2784.88 | | 12 | Absolute error (psi) | −50.77 | −115.12 | | 13 | Relative error (%) | −1.75 | −3.97 |
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