Gas extraction method for extra thick coal seam
A technology for gas drainage and extra-thick coal seam, which is applied in the field of extra-thick coal seam gas drainage, can solve the problems of large effective gas control range, single method, and poor gas control effect, so as to reduce the occurrence of coal mine gas accidents and improve gas drainage. The effect of improving mining efficiency and improving the scope of effective governance
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[0019] In order to make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and not to limit the present invention, that is, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.
[0020] Attached Figure 1-4 , A detailed description of the method for gas drainage in an extra-thick coal seam of the present invention is a method for gas drainage in an extra-thick coal seam. The method includes the following steps:
[0021] Step 1. Construction of two vertical horizontal drillings on the ground 1. When the vertical part of the drilling reaches the middle of the coal seam to be mined, use the drill bit window tool to guide the drilling direction so that the drill bit will con...
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