International Journal of Earth Sciences and Engineering

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Analysis of Broken Zone in CBM Artificial Momentum Cavity Completion


Affiliations
1 Research Institute of Petroleum Exploration and Development, Beijing-100083, China
2 CNPC Drilling Research Institute, Beijing-100097, China
3 China Petroleum Technology and Development Corporation, Beijing-100028, China
4 School of Mechanical Engineering, Yangtze University, Jingzhou-434023, China
 

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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  • Analysis of Broken Zone in CBM Artificial Momentum Cavity Completion

Abstract Views: 179  |  PDF Views: 123

Authors

Wan Jifang
Research Institute of Petroleum Exploration and Development, Beijing-100083, China
Li Jingcui
CNPC Drilling Research Institute, Beijing-100097, China
Shi Wen
China Petroleum Technology and Development Corporation, Beijing-100028, China
Zhang Qunhai
China Petroleum Technology and Development Corporation, Beijing-100028, China
Ren Haohao
School of Mechanical Engineering, Yangtze University, Jingzhou-434023, China

Abstract


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.