DOI: 10.11799/ce201802005
Study on investigation method for effective drainage radius of drilling in coal seam gas pre-drainage
XU Zun-yu
Abstract：According to gas geological conditions of No.1 coal seam in Xinji No.2 Mine, the drilling drainage radius of the No.1 coal seam was investigated using different effective drainage radius methods in the floor roadway of 220112 stope. The results show that the variation of the data during the period of observation with the method of pressure drop is large, and the results of the study are quite different from those of other methods; the theoretical calculation method, content method and flow method are stable whose results are basically the same. It is considered that more than 2 inspection methods can be used to study the effective drainage radius of borehole, and the minimum value of different inspection results should be taken as the final effective drainage radius; the research results can provide design basis for No.1 coal seam gas drainage.
Keywords：Effective drainage radiuspressure drop methodcontent methoddischarge methodgas flow
Publication Date：2018-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：4( 19-22 )