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Table 4 Time interval (∆t) with start and end values in parentheses, average borehole pressure (Pb), increase in outlet pressure (∆P), and permeability index (ki) for each direction at each flow rate in Run 2
Flow rate (mL/min) | Direction | ∆t (s) | Pb (MPa) | ∆P (MPa) | ki (s−1) |
|---|---|---|---|---|---|
1 (1st use) | σ2 (L) | 1350 (1200–2550) | 0.9 | 0.3 | 2 × 10–4 |
σ2 (R) | 1350 (1200–2550) | 0.9 | 0.1 | 8 × 10–5 | |
σ3 (F) | 1350 (1200–2550) | 0.9 | 0.1 | 8 × 10–5 | |
σ3 (B) | 1350 (1200–2550) | 0.9 | 0.3 | 2 × 10–4 | |
5 | σ2 (L) | 1200 (200–1400) | 1.3 | 0.2 | 1 × 10–4 |
σ2 (R) | 1200 (200–1400) | 1.3 | 0 | 0 | |
σ3 (F) | 1200 (200–1400) | 1.3 | 0 | 0 | |
σ3 (B) | 1200 (200–1400) | 1.3 | 0.2 | 1 × 10–4 | |
10 | σ2 (L) | 800 (700–1500) | 2.5 | 0.3 | 2 × 10–4 |
σ2 (R) | 800 (700–1500) | 2.5 | 0.1 | 5 × 10–5 | |
σ3 (F) | 800 (700–1500) | 2.5 | 0.3 | 2 × 10–4 | |
σ3 (B) | 800 (700–1500) | 2.5 | 0.1 | 5 × 10–5 | |
15 | σ2 (L) | 700 (800–1500) | 3.7 | 0.1 | 4 × 10–5 |
σ2 (R) | 700 (800–1500) | 3.7 | 0.2 | 8 × 10–5 | |
σ3 (F) | 700 (800–1500) | 3.7 | 0.9 | 3 × 10–4 | |
σ3 (B) | 700 (800–1500) | 3.7 | 0 | 0 | |
1 (2nd use) | σ2 (L) | 900 (1400–2300) | 1.1 | 0.2 | 2 × 10–4 |
σ2 (R) | 900 (1400–2300) | 1.1 | 0.1 | 1 × 10–4 | |
σ3 (F) | 900 (1400–2300) | 1.1 | 0.1 | 1 × 10–4 | |
σ3 (B) | 900 (1400–2300) | 1.1 | 0 | 0 |