Research Article
Gas Displacement Engineering Test by Combination of Low and Medium Pressure Injection with Liquid CO2 in High Gas and Low Permeability Coal Seam
Table 2
Drilling parameter design table.
| | Drilling name | Hole depth (m) | Azimuth (°) | Inclination (°) | Aperture (mm) | Sealing length (m) |
| | Injection hole | 140 | 90 | 0.5°–1° | 113 | 40 | | Observation hole | 140 | 90 | 0.5°–1° | 113 | 12 | | Original drainage hole | 140 | 90 | 0°–1° | 113 | 12 |
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