Research on Determination of Effective Gas Drainage Radius of Boreholes by SF6 Tracer Method and Numerical Simulation
CHEN Hui
NIU Jianchun
LI Zhilei
LI Wenming
Abstract：In order to accurately determine the effective gas drainage radius of boreholes in a coal seam and achieve an ideal gas drainage effect, the effective gas drainage radius of boreholes in the test area in Chengjiao Mine was determined according to the actual occurrence conditions of deep coal seams in this mine, based on the comparative analysis of various determination methods for the effective gas drainage radius of boreholes, with the combination of SF6 gas tracer method and COMSOL Multiphysics numerical simulation and by using the measured results and simulated results. The research results showed that when the diameter of gas drainage hole was 92 mm and the negative pressure for the gas drainage was 15 kPa, the effective gas drainage radius was 1. 73 m after gas pre-drainage for 60 days.
Keywords：coal-seam gasgas drainage by boreholeeffective radiusSF6 gas tracer methodnumerical simulation
Publication Date：2016-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：5( 14-18 )