International Journal of Earth Sciences and Engineering

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Cavity completion of coalbed methane as an emerging technology has gradually been widely used abroad; there are three zones after completion, cavity, broken zone and disturbed zone. This technology could improve the permeability of coalbed and then improved the productivity greatly. In this paper, the crack propagation of pressurization process and the shear fracture of relief process are under series of studies. In conclusion, the potential radius of extension fracture zone is presented; shear fracture always taking place along the minimum horizontal stress direction is proved theoretically, and anisotropic coalbed is suitable for artificial momentum cavity completion.

Keywords

CBM, Cavity Completion, Artificial Momentum, Crack Propagation, Shear Fracture, Anisotropy.
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