Title: Influence of coal mechanical properties and water content on generation characteristics of coal particles

Authors: Yingchun Wei; Maolin Cui; Zheng Yao; Anmin Wang; Baolei Cui; Zhejun Pan

Addresses: College of Geoscience and Surveying Engineering, China University of Mining and Technology – Beijing, D11, Xueyuan Road, Haidian District, Beijing, China ' College of Geoscience and Surveying Engineering, China University of Mining and Technology – Beijing, D11, Xueyuan Road, Haidian District, Beijing, China ' Shaanxi Institute of Geological Survey, No. 25, Xiying Road, Yanta District, Xi'an City, Shaanxi Province, China ' College of Geoscience and Surveying Engineering, China University of Mining and Technology – Beijing, D11, Xueyuan Road, Haidian District, Beijing, China ' College of Geoscience and Surveying Engineering, China University of Mining and Technology – Beijing, D11, Xueyuan Road, Haidian District, Beijing, China ' CSIRO Energy Business Unit, Private Bag 10, Clayton South, VIC 3169, Australia; Key Laboratory of Continental Shale Hydrocarbon Accumulation and Efficient Development, Ministry of Education, Northeast Petroleum University, No. 99, Xuefu Road, Daqing City, Heilongjiang Province, China

Abstract: Coal particles have a great importance in the production of coalbed methane. To reveal the relationship between the coal mechanical properties and the coal particles characteristics generated by the coal samples with different coal rank, coal failure experiments in the natural state and water-saturated state under triaxial compression are performed. The effects of coal rank, coal mechanical properties and water content on the characteristics of coal particles generated are investigated. The results show that the water-saturated sample has a lower compressive strength than the corresponding natural sample. Coal with different rank shows various fracturing modes after failure. Compared with the natural sample, the water-saturated sample generates more amount of coal particles. As coal rank increases, the amount of coal particles shows a 'U' shape trend, while there is a negative exponential correlation between the amount of coal particles and the compressive strength of coal. [Received: June 3, 2020; Accepted: April 10, 2021]

Keywords: coalbed methane; coal particles; mechanical properties; water content.

DOI: 10.1504/IJOGCT.2022.121265

International Journal of Oil, Gas and Coal Technology, 2022 Vol.29 No.4, pp.359 - 378

Received: 03 Jun 2020
Accepted: 10 Apr 2021
Published online: 03 Mar 2022 *

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