DOI: 10.11799/ce201706018
Application of reverse circulation sampling indetermination ofdrilling cuttings gas desorption index K1
KANG Jian-ning
ZHANG Rui
HU Jie
Abstract：As the traditional method of K1 determination using twist drill pipe mechanical sampling is greatly influenced by the residual powder of the hole wall and the coal samples exposure time can't be accurately defined,reverse circulation sampling technique based on double-wall drill pipe is proposed for the determination of K1 value for underground coal mine.This technique can transport the hole drilling cuttings at the bottom to the drilling external,so as to achieve rapid and fixed-point sampling,and avoid the problems existing in the traditional sampling method,such as small effective borehole depth and poor reliability for prediction of deep hole.K1 value determination test using reverse circulation sampling technique in Wulan Coal Mine showed that,the effective prediction depth of K1 value was up to 30m,and the result was not affected by borehole inclination.
Keywords：reverse circulation samplingdrilling cuttings gas desorption indexK1 valuerapid and fixed-pointdeep hole prediction
Publication Date：2017-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：4( 60-63 )