Research Article
Effects of Borehole Arrangement on Methane Migration and Implications for High Efficiency Extraction in Intact and Tectonic Combined Coal Seams
Table 4
Comparison of the gas extraction amount under different simulation cases (300 d).
| | Case | Traditional single-row borehole arrangement for gas extraction (kg/m3) | Optimal dislocation borehole arrangement for gas extraction (kg/m3) | Incremental gas extraction amount (%) |
| | 1 | 3.674 | 4.052 | 10.3 | | 2 | 2.676 | 3.526 | 31.8 | | 3 | 2.108 | 3.273 | 55.3 | | 4 | 1.782 | 3.091 | 73.5 | | 5 | 1.533 | 2.948 | 91.0 | | 6 | 2.887 | 3.828 | 32.5 | | 7 | 2.791 | 3.719 | 33.2 | | 8 | 2.578 | 3.364 | 30.5 | | 9 | 2.523 | 3.216 | 27.5 |
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