Extraction method for mining formed composite goaf coalbed methane through lower caving method
A technology for old empty areas and coalbed methane, which is applied in the field of coalbed methane extraction in composite old empty areas, and can solve problems such as waste of resources
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Embodiment 1
[0026] Example 1: The method of extracting the coalbed methane in the composite old goaf formed by the caving method of the upper part of the cutter column and the lower part
[0027] This embodiment takes a certain working face of Yuecheng Mine of Shanxi Coal Group as an example, see figure 1 Shown, illustrate the extraction method of this invention. Yuecheng Mine is located in Qinshui Coalfield, which is one of the important coalfields rich in coalbed methane resources in my country. The recoverable coal seams in the coalfield are No. 3 coal seam of Shanxi Formation and No. 9 and No. 15 coal seams of Taiyuan Formation. Due to history and outdated mining methods, the recovery rate of No. 3 coal in the main coal seam in the coalfield is low, a large amount of coal is left underground, and the old goaf area is quite rich in coalbed methane resources. The No. 9 coal in the thin coal seam with an average distance of 47.16 meters from the floor of Coal No. 3 has an average coal t...
Embodiment 2
[0040] Example 2: The method of extracting coalbed methane in the composite old goaf formed by caving mining in both the upper part and the lower part
[0041] Taking a certain working face of Jinsheng Coal Mine of Shanxi Coal Group as an example below, the inventive method is illustrated. Jinsheng Coal Mine is located in Qinshui Coalfield, which is one of the important coalfields rich in coalbed methane resources in my country. The mineable coal seams within the scope of the coalfield are the No. 3 coal seam of the Shanxi Formation and the No. 9 and No. 15 coal seams of the Taiyuan Formation. Due to history and outdated mining methods, the recovery rate of No. 3 coal in the main coal seam in the coalfield is low, a large amount of coal is left underground, and the old goaf area is quite rich in coalbed methane resources. The No. 9 coal in the thin coal seam with an average distance of 53.20 meters from the floor of Coal No. 3 has an average coal thickness of 0.81 meters. The...
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