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1 Journal of Sustainable Mining

1 2025

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Eco-efficiency and life cycle assessment of the long reach directionally drilled and cross-measure boreholes methane drainage technologies employed in bituminous coal mine on the basis of the pilot scale experimental data

Jura Bartłomiej, Krawczyk Piotr, Śliwińska Anna, Skiba Jacek, Karbownik Marcin, Howaniec Natalia

Journal of Sustainable Mining

2025

Vol. 24, iss. 2

189--202

This paper presents the results of eco-efficiency and life cycle analysis conducted for two methane drainage technologies: cross-measure (CM) and long reach directionally drilled (LRDD) boreholes. In the analyses, data from coal mine methane drainage of two coal panels, I-C and II-C, located at the Staszic-Wujek coal mine in Poland, were used. The results of the life cycle and eco-efficiency assessments showed that employment of long reach directional drilling boreholes method has a lower environmental impact and is more eco-efficient, causing the lower environmental impact and lower construction and operating costs per cubic meter of methane extracted. The results of the sensitivity analysis indicated that the quantity of methane extracted has the greatest impact on the eco-efficiency index. For LRDD technology, the quantities of methane captured are significantly higher than for CM technology. The advantage of LRDD technology results mainly from the possibility of further extraction of methane from the exploited coal panel after coal extraction is completed. This is not possible with CM technology, in case of which the boreholes are being destroyed during coal extraction. CM technology also requires drilling a much larger number of boreholes and of a higher total length than needed in LRDD technology.