Influence of geotechnical factors on gas flow experienced in a UK longwall coal mine panel

Whittles, D.N.; Lowndes, I.S.; Kingman, S.W.; Yates, Campbell C.; Jobling, S.

doi:10.1016/j.ijrmms.2005.07.006

Cited by 136 publications

(72 citation statements)

References 5 publications

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“…In traditional coal mining, CBM is considered a type of hazardous gas, not only because of the danger of explosions and gas outbursts, but also because of serious threat to the safety of mine production [1][2][3][4][5][6]. In contrast, CH4, the main ingredient of CBM, is a greenhouse gas, whose greenhouse effect is ~21-23 times as strong as that of CO2 [7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

“…Among them, the coal seams in America and Australia are of little depth and high permeability, and surface well predrainage and underground directional long borehole drainage technologies are their major and minor strategies, respectively. Part of Germany and Poland are similar to the coal seam conditions in Chinese mining areas; however, their yields are low and the number of underground coal seams is relatively small; and the gas drainage is mainly dependent on the underground cross-measure boreholes gas drainage technology [1][2][3][4][5][6]15]. In contrast, the Chinese coal seams are of larger depth and high ground stress; therefore, underground drainage is the main approach to extract CBM.…”

Section: Introductionmentioning

confidence: 99%

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Coal and Coalbed Methane Co-Extraction Technology Based on the Ground Movement in the Yangquan Coalfield, China

Fu-xi

et al. 2015

Energies

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Abstract:The Yangquan coalfield is one of the typical highly gassy mining areas in China. However, its coal seams are of lower permeability, which are not conductive to coalbed methane (CBM) drainage. In this study, based on the theory of the ground movement, we analyzed the principle of coal and CBM coextraction in the Yangquan coalfield, and established the technology system of coal and CBM coextraction which was further implemented in the coal and CBM coextraction in the Yangquan coalfield. The coal and CBM coextraction technologies based on the "pressure-relief and permeability-increase" effect caused by the mining overburden movement can optimally ensure the safe and efficient mining and improve the gas drainage rate. A series of developed coal and CBM coextraction technologies for the Yangquan coalfield were mainly characterized by the high-level gas drainage roadway. This reached a maximum gas drainage amount of 270,000 m 3 /day for single drainage roadway and a pressure-relief gas drainage rate of >90%. Those technologies significantly improved the gas drainage effect safely and efficiently achieving the coal and CBM coextraction. OPEN ACCESSEnergies 2015, 8 6882

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Coal and Coalbed Methane Co-Extraction Technology Based on the Ground Movement in the Yangquan Coalfield, China

Fu-xi

et al. 2015

Energies

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“…In addition to complexities given in these studies, boreholes may deform under mining stresses and strata displacements [13][14][15], making production predictions even more difficult. Studies presented in [7,12] do not take borehole stability issues into account while predicting GGV performance.…”

Section: Introductionmentioning

confidence: 99%

Sequential Gaussian co-simulation of rate decline parameters of longwall gob gas ventholes

Karacan¹,

Olea²

2013

International Journal of Rock Mechanics and Mining Sciences

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Gob gas ventholes (GGVs) are used to control methane inflows into a longwall mining operation by capturing the gas within the overlying fractured strata before it enters the work environment. Using geostatistical co-simulation techniques, this paper maps the parameters of their rate decline behaviors across the study area, a longwall mine in the Northern Appalachian basin. Geostatistical gas-in-place (GIP) simulations were performed, using data from 64 exploration boreholes, and GIP data were mapped within the fractured zone of the study area. In addition, methane flowrates monitored from 10 GGVs were analyzed using decline curve analyses (DCA) techniques to determine parameters of decline rates. Surface elevation showed the most influence on methane production from GGVs and thus was used to investigate its relation with DCA parameters using correlation techniques on normal-scored data. Geostatistical analysis was pursued using sequential Gaussian co-simulation with surface elevation as the secondary variable and with DCA parameters as the primary variables. The primary DCA variables were effective percentage decline rate, rate at production start, rate at the beginning of forecast period, and production end duration. Cosimulation results were presented to visualize decline parameters at an area-wide scale. Wells located at lower elevations, i.e., at the bottom of valleys, tend to perform better in terms of their rate declines compared to those at higher elevations. These results were used to calculate drainage radii of GGVs using GIP realizations. The calculated drainage radii are close to ones predicted by pressure transient tests.

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“…So here, these nine parameters involved in outburst are selected as the main parameters to construct the interaction matrix and to establish the assessment system, and the suggested rating values of these nine parameters can be seen in Iable 2. According to the constructing principIes of interaction matrix described in Section 3.1, the nine main parameters are located along the diagonal elements and the interacting actions between each two parameters are placed in the corresponding off-diagonal elements, thus a 9 x 9 square interaction matrix including 9 diagonal terms and 81 off-diagonal terms is constructed (see Figure 3) to represent the outburst system, here the interaction matrix constructing was carried out mainly based upon the knowledge obtained fram the previous studies [60][61][62][63][64][65][66] and the author's experiences . For the coding of the established interaction matrix, here we also use the ESQ coding systems suggested by Hudson [3] (see Table 3).…”

Section: Formulating the Outburst Assessmentmentioning

confidence: 99%

Development of a quantitative assessment approach for the coal and gas outbursts in coal mines using rock engineering systems

Zhou

Herrera

Hidalgo

2017

International Journal of Mining, Reclamation and Environment

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ABSTRAeTIn this study, a new approach is proposed and developed for evaluating the comprehensive outburst index (range between Oand 100), which is a quantitative assessment approach and will enable us to better understand the risk degree of coal and gas outburst in coal mines. By selecting some typical risk-free and high-risk outburst mines from China as the evaluation targets, we assessed their comprehensive outburst indexes with the developed approach. The assessment results are fully consistent with the actual situations, which indicates that our new developed approach is reliable and can be recommended for applying in more coal mines.

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Influence of geotechnical factors on gas flow experienced in a UK longwall coal mine panel

Cited by 136 publications

References 5 publications

Coal and Coalbed Methane Co-Extraction Technology Based on the Ground Movement in the Yangquan Coalfield, China

Coal and Coalbed Methane Co-Extraction Technology Based on the Ground Movement in the Yangquan Coalfield, China

Sequential Gaussian co-simulation of rate decline parameters of longwall gob gas ventholes

Development of a quantitative assessment approach for the coal and gas outbursts in coal mines using rock engineering systems

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