Relations Between Productivity of CBM Vertical Wells and Coal Structure in Encun Mine Field
Received date: 2009-09-21
Revised date: 2010-01-07
Online published: 2010-06-10
The original permeability, fracturing and reconstructing permeability, surrounding permeability affect the pressure spread contrail in the production process of the CBM vertical wells, and then control the productivity of CBM vertical wells. Based on the raw data of exploration and development of CMB in the Encun mine field, we classified the coal structure into the primary structure coal (Ⅰ), fragmentation coal (Ⅱ) and tectonic coal (Ⅲ and Ⅳ), in combination of curve of logging response and drilling core. According to elasticity theory of rock and state of natural fracture in different coal structures, we set up a model about the azimuth of natural fracture and the direction of the stress, and discussed the main controlling factors about main fractures in different coal structures. Based on azimuth of extended fracture and pressure spread contrail in the production process of CBM vertical wells, we got the relations between the productivity of CBM vertical wells and different coal structures. The production tests showed that under current hydraulic fracturing crafts the fragmentation coal would be the best coal reservoir, then primary structure coal, and the tectonic coal was hardly modified to improve production capacity of CBM vertical wells.
Key words： Coal structure; Coalbed methane; Productivity; Ground stress; Hydraulic fracturing.
NI Xiao-Ming, CHEN Peng, LI Guang-Sheng, ZHANG Yi-Sheng . Relations Between Productivity of CBM Vertical Wells and Coal Structure in Encun Mine Field[J]. Natural Gas Geoscience, 2010 , 21(3) : 508 -512 . DOI: 10.11764/j.issn.1672-1926.2010.03.508
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