Study on Desorption Index Sensitivity of Drilling Cuttings from Tunlan Mine

Xu, GAO; Lang, ZHANG; Dong, WANG; Long-yong, SHU
October 2014
Coal Science & Technology (0253-2336);Oct2014, Vol. 42 Issue 10, p41
Academic Journal
In order to establish and improve the coal and gas outburst prevention system of Tunlan Mine ,relative sensitivities of drilling cuttings about gas desorption index K1 and Δh2 were determined. Based on high pressure set volume adsorption and desorption experiments and simulation measurements of the drilling cuttings and desorption index ,the study found that the gas adsorption balance pressure and gas desorption volume of each seam sample from Tunlan Mine was in a power function relationship,and K1 and Δh2 was in a linear relationship. The first minute gas desorption volume of each seam sample from Tunlan Mine was more obvious than the fourth and fifth minute by the control function of desorption balance pressure. With the site measured of K1 and Δh2 and combined with the minimum mean variance method analysis,the paper hold that the K1 of each seam in Tunlan Mine was more sensitive than Δh2 index.Therefore,when predicting the outburst danger was conducted for each team in Tunlan Mine, the drilling cutting desorption index K1 should be selected as the main index ( sensitive index ) and Δh2 should be selected as an auxiliary index.


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