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ARTICLE

Research on Reliability of Desorption Indexes of Drilling Cuttings (K₁ and ∆h₂): A Case-Based on Pingdingshan Mining Region, China

Jianguo Zhang¹, Biao Hu^2,*, Xiyuan Li¹, Hongxing Zhou², Zhixu Dai³, Yanlei Lu³, Deyang Wang²

1 State Key Laboratory of Coking Coal Exploitation and Comprehensive Utilization, China Pingmei Shenma Group, Pingdingshan, 467009, China
2 Laboratory of Gas and Fire Control for Coal Mines (China University of Mining and Technology), Ministry of Education, Xuzhou, 221116, China
3 Pingdingshan Tian’an Coal Mining Co., Ltd., Pingdingshan, 467000, China

* Corresponding Author: Biao Hu. Email:

Energy Engineering 2021, 118(3), 605-614. https://doi.org/10.32604/EE.2021.014655

Received 17 October 2020; Accepted 30 November 2020; Issue published 22 March 2021

Abstract

To accurately predict the risk of coal and gas outburst and evaluate the reliability of desorption indexes of drilling cuttings (K₁ and ∆h₂) 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 K₁ and ∆h₂ present power function relationships with methane pressure. Similarly, the power function relationships also can be found between the initial desorption characteristics (Q₁ and Q_4–5) and the methane pressure. Finally, the average relative error between the measured value and the calculated value of Q₁ based on K₁ is less than that of Q_4–5 based on ∆h₂, which indicates that K₁ is a more reliable index than ∆h₂ to predict the risk of coal and gas outburst in the No. 16 coal seam of Pingmei No. 12 coal mine.

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