Novel integrated techniques of drilling-slotting-separation-sealing for enhanced coal bed methane recovery in underground coal mines

Zou, Quanle, Lin, Baiquan, Zheng, Chunshan, Hao, Zhiyong, Zhai, Cheng, Liu, Ting, Liang, Jinyan, Yan, Fazhi, Yang, Wei and Zhu, Chuanjie (2015) Novel integrated techniques of drilling-slotting-separation-sealing for enhanced coal bed methane recovery in underground coal mines. Journal of Natural Gas Science and Engineering, 26 960-973. doi:10.1016/j.jngse.2015.07.033

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Author Zou, Quanle
Lin, Baiquan
Zheng, Chunshan
Hao, Zhiyong
Zhai, Cheng
Liu, Ting
Liang, Jinyan
Yan, Fazhi
Yang, Wei
Zhu, Chuanjie
Title Novel integrated techniques of drilling-slotting-separation-sealing for enhanced coal bed methane recovery in underground coal mines
Journal name Journal of Natural Gas Science and Engineering   Check publisher's open access policy
ISSN 1875-5100
Publication date 2015-09-01
Year available 2015
Sub-type Article (original research)
DOI 10.1016/j.jngse.2015.07.033
Open Access Status File (Author Post-print)
Volume 26
Start page 960
End page 973
Total pages 14
Place of publication Philadelphia, United States
Publisher Elsevier
Language eng
Subject 2102 Energy Engineering and Power Technology
Abstract Coal bed Methane (CBM), a primary component of natural gas, is a relatively clean source of energy. Nevertheless, the impact of considerable coal mine methane emission on climate change in China has gained an increasing attention as coal production has powered the country's economic development. It is well-known that coal bed methane is a typical greenhouse gas, the greenhouse effect index of which is 30 times larger than that of carbon dioxide. Besides, gas disasters such as gas explosive and outburst, etc. pose a great threat to the safety of miners. Therefore, measures must be taken to capture coal mine methane before mining. This helps to enhance safety during mining and extract an environmentally friendly gas as well. However, as a majority of coal seams in China have low-permeability, it is difficult to achieve efficient methane drainage. Enhancing coal permeability is a good choice for high-efficiency drainage of coal mine methane. In this paper, a modified coal-methane co-exploitation model was established and a combination of drilling–slotting-separation–sealing was proposed to enhance coal permeability and CBM recovery. Firstly, rapid drilling assisted by water-jet and significant permeability enhancement via pressure relief were investigated, guiding the fracture network formation around borehole for high efficient gas flow. Secondly, based on the principle of swirl separation, the coal–water–gas separation instrument was developed to eliminate the risk of gas accumulation during slotting and reduce the gas emission from the ventilation air. Thirdly, to improve the performance of sealing material, we developed a novel cement-based composite sealing material based on the microcapsule technique. Additionally, a novel sealing–isolation combination technique was also proposed. Results of field test indicate that gas concentration in slotted boreholes is 1.05–1.91 times higher than that in conventional boreholes. Thus, the proposed novel integrated techniques achieve the goal of high-efficiency coal bed methane recovery.
Keyword Enhanced coal bed methane recovery
Permeability enhancement
Dual-power drilling
Sealing material
Coal-water-gas separation
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Mechanical & Mining Engineering Publications
Official 2016 Collection
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Citation counts: TR Web of Science Citation Count  Cited 34 times in Thomson Reuters Web of Science Article | Citations
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