Determination and Application on Critical Value of Drilling Cuttings Gas Desorption Indices
KONG Sheng-li
CHENG Long-biao
WANG Hai-feng
ZHOU Hong-xing
Abstract：In order to define the critical value of drilling cuttings gas desorption indices which predicted gas outburst risk,based on the physical meaning explanation of drilling cuttings gas desorption indices and the desorption regulation of the No.2 coal seam in Tunlan Coal Mine,the relationship of the indices,the gas desorption quantity and the gas pressure were obtained.Through the theoretical calculation and actual mining situation,the outburst of the No.2 coal seam was characterised by high gas pressure and low gas content.The critical value of gas pressure which could indicate the outburst was given.The critical value of drilling cuttings gas desorption indices were calculated,0.18 mL/(g·min0.5 )for K1 and 95 Pa for Δh2 .The field application showed that the identified critical value was more accurate for the outburst perdiction,which could better guarantee the safety mining.
Keywords：coal and gas outburstoutburst riskdrilling cuttings gas desorption indicescritical value
Publication Date：2014-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：5( 56-59,64 )