TY  - EJOU
AU  - Zhang, Jianguo 
AU  - Hu, Biao 
AU  - Li, Xiyuan 
AU  - Zhou, Hongxing 
AU  - Dai, Zhixu 
AU  - Lu, Yanlei 
AU  - Wang, Deyang 

TI  - Research on Reliability of Desorption Indexes of Drilling Cuttings (<i>K</i><sub>1</sub> and ∆<i>h</i><sub>2</sub>): A Case-Based on Pingdingshan Mining Region, China
T2  - Energy Engineering

PY  - 2021
VL  - 118
IS  - 3
SN  - 1546-0118

AB  - To accurately predict the risk of coal and gas outburst and evaluate the reliability of desorption indexes of drilling cuttings (<i>K</i><sub>1</sub> and ∆<i>h</i><sub>2</sub>) in No. 16 coal seam of Pingmei No. 12 coal mine, two sets of coal samples were selected from the target coal seams for proximate analyses, methane adsorption/desorption tests, and desorption indexes of drilling cuttings tests. The results indicated that the desorption volume in the initial stage of desorption is large, and increases slowly in the later stage. The methane desorption volume of PMD1 and PMD2 coal samples accounts for 15.14%–18.09% and 15.72%–18.17% respectively in the first 1 min, and 43.92%–48.55% and 41.87%–52.25% respectively in the first 10 min in the 120 min desorption tests. Both <i>K</i><sub>1</sub> and ∆<i>h</i><sub>2</sub> present power function relationships with methane pressure. Similarly, the power function relationships also can be found between the initial desorption characteristics (<i>Q</i><sub>1</sub> and <i>Q</i><sub>4–5</sub>) and the methane pressure. Finally, the average relative error between the measured value and the calculated value of <i>Q</i><sub>1</sub> based on <i>K</i><sub>1</sub> is less than that of <i>Q</i><sub>4–5</sub> based on ∆<i>h</i><sub>2</sub>, which indicates that <i>K</i><sub>1</sub> is a more reliable index than ∆<i>h</i><sub>2</sub> to predict the risk of coal and gas outburst in the No. 16 coal seam of Pingmei No. 12 coal mine.
KW  - Coal and gas outburst; methane; desorption; desorption indexes of drilling cuttings

DO  - 10.32604/EE.2021.014655