Research Article
Investigation on the CBM Extraction Techniques in the Broken-Soft and Low-Permeability Coal Seams in Zhaozhuang Coalmine
Table 2
Hydraulic fracturing test parameters and results.
| | Number | Stress state/MPa | Injection rate
ml/min | Fracturing fluid | Fracture shape | | | |
| | 01# | 3 | 5 | 6 | 20 | Water | Coal seam unpenetrated | | 02# | 3 | 5 | 7 | 20 | Water | Coal seam unpenetrated | | 03# | 3 | 5 | 7 | 20 | Water | Coal seam unpenetrated | | 04# | 3 | 5 | 8 | 20 | Water | Coal seam unpenetrated | | 05# | 3 | 5 | 8 | 20 | Water | Coal seam unpenetrated | | 06# | 3 | 5 | 9 | 20 | Water | Coal seam penetrated | | 07# | 3 | 5 | 9 | 20 | Water | Coal seam penetrated | | 08# | 3 | 5 | 9 | 20 | Water | Coal seam penetrated | | 09# | 3 | 5 | 15 | 20 | Water | Coal seam penetrated |
|
|
