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Table 5 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 3
Flow rate (mL/min) | Direction | ∆t (s) | Pb (MPa) | ∆P (MPa) | ki (s−1) |
|---|---|---|---|---|---|
1 (1st use) | σ2 (L) | 2100 (1500–3600) | 0.4 | 0.2 | 2 × 10–4 |
σ2 (R) | 2100 (1500–3600) | 0.4 | 0.2 | 2 × 10–4 | |
σ3 (F) | 2100 (1500–3600) | 0.4 | 0.1 | 1 × 10–4 | |
σ3 (B) | 2100 (1500–3600) | 0.4 | 0 | 0 | |
5 | σ2 (L) | 1270 (500–1770) | 1.2 | 1.2 | 8 × 10–4 |
σ2 (R) | 1270 (500–1770) | 1.2 | 1.1 | 7 × 10–4 | |
σ3 (F) | 1270 (500–1770) | 1.2 | 0.5 | 3 × 10–4 | |
σ3 (B) | 1270 (500–1770) | 1.2 | 0 | 0 | |
10 | σ2 (L) | 700 (200–900) | 2.5 | 2.6 | 1 × 10–3 |
σ2 (R) | 700 (200–900) | 2.5 | 2.2 | 1 × 10–3 | |
σ3 (F) | 700 (200–900) | 2.5 | 2.6 | 1 × 10–3 | |
σ3 (B) | 700 (200–900) | 2.5 | 0 | 0 | |
15 | σ2 (L) | 560 (250–810) | 3.2 | 1.1 | 1 × 10–3 |
σ2 (R) | 560 (250–810) | 3.2 | 1.8 | 2 × 10–3 | |
σ3 (F) | 560 (250–810) | 3.2 | 2.9 | 3 × 10–3 | |
σ3 (B) | 560 (250–810) | 3.2 | 0 | 0 | |
1 (2nd use) | σ2 (L) | 1600 (2000–3600) | 1.0 | 0.7 | 4 × 10–4 |
σ2 (R) | 1600 (2000–3600) | 1.0 | 0.5 | 3 × 10–4 | |
σ3 (F) | 1600 (2000–3600) | 1.0 | 0.3 | 2 × 10–4 | |
σ3 (B) | 1600 (2000–3600) | 1.0 | 0 | 0 |