Methane Explosions and Outbursts: Quantum Theory of Methane Content, Outburst Hazards and Methane Drainage from Coal Beds

2019 ◽  
Vol 146 (4/2019) ◽  
pp. 138-143
Author(s):  
I.E. Kolesnichenko ◽  
V.B. Artemiev ◽  
E.A. Kolesnichenk ◽  
E.I. Lyubomishchenko
Keyword(s):  
Quantum Theory ◽  
Methane Content ◽  
Coal Beds ◽  
Methane Drainage

scholarly journals Method for Determining the Coalbed Methane Content with Determination the Uncertainty of Measurements

2016 ◽  
Vol 61 (2) ◽  
pp. 443-456 ◽  
Author(s):  
Nikodem Szlązak ◽  
Marek Korzec
Keyword(s):  
Coalbed Methane ◽  
Coal Sample ◽  
Methane Content ◽  
Underground Mines ◽  
Methane Drainage ◽  
Uncertainty Of Measurements ◽  
Underground Coal Mines ◽  
Mining Works ◽  
Prevention Methods ◽  
Two Stages

AbstractMethane has a bad influence on safety in underground mines as it is emitted to the air during mining works. Appropriate identification of methane hazard is essential to determining methane hazard prevention methods, ventilation systems and methane drainage systems. Methane hazard is identified while roadways are driven and boreholes are drilled. Coalbed methane content is one of the parameters which is used to assess this threat. This is a requirement according to the Decree of the Minister of Economy dated 28 June 2002 on work safety and hygiene, operation and special firefighting protection in underground mines. For this purpose a new method for determining coalbed methane content in underground coal mines has been developed. This method consists of two stages - collecting samples in a mine and testing the sample in the laboratory. The stage of determining methane content in a coal sample in a laboratory is essential. This article presents the estimation of measurement uncertainty of determining methane content in a coal sample according to this methodology.

The inverse correlations between methane content and elastic parameters of coal-bed methane reservoirs

Geophysics ◽  
2013 ◽  
Vol 78 (4) ◽  
pp. D237-D248 ◽  
Author(s):  
Xin-Ping Chen ◽  
Quanming Huo ◽  
Jiandong Lin ◽  
Yang Wang ◽  
Fenjin Sun ◽  
...  
Keyword(s):  
Methane Content ◽  
Coal Bed ◽  
Coal Bed Methane ◽  
Biot Theory ◽  
Elastic Parameters ◽  
Gas Reservoirs ◽  
Coal Beds ◽  
Amplitude Versus Offset ◽  
Environmental Variations ◽  
Amplitude Versus

We investigated three coal-bed methane (CBM) reservoirs in which there exist, when we are careful about data quality and reduce environmental variations, inverse correlations between methane content and the elastic properties of the coal beds. Such inverse correlations may exist in general in high- and medium-rank CBM reservoirs. There is evidence that supports the generalization of such inverse correlations and factors that distort them. These distorting factors may prevent identification of such inverse correlations in certain CBM prospects; however, they cannot negate the underlying inverse correlations. Such inverse correlations may play a role in CBM amplitude versus offset (AVO) similar to the role played by Gassmann-Biot theory ( Gassmann, 1951 ; Biot, 1956 , 1962 ) in AVO technology for conventional gas reservoirs. This may lay the first brick for a theoretical basis of CBM AVO.

scholarly journals EFFECTIVE TECHNOLOGY FOR DRILLING ADVANCE METHANE DRAINAGE BOREHOLES IN OUTBURST-PRONE COAL BEDS

Ugol ◽  
2021 ◽  
pp. 11-14
Author(s):  
T.K. Isabek ◽  
◽  
V.F. Demin ◽  
D.S. Shontaev ◽  
S.K. Malybaev ◽  
...  
Keyword(s):  
Coal Beds ◽  
Methane Drainage ◽  
Effective Technology

Methane content and relative methane releasability versus occurrence depth of coal seams in Mạo Khê mine

2020 ◽  
pp. 26-37
Author(s):  
Dik Thang Fam ◽  
Tuan An’ Fan ◽  
K. S. Kolikov
Keyword(s):  
Coal Mining ◽  
Mine Drainage ◽  
Mining Industry ◽  
Methane Content ◽  
Gas Content ◽  
Coal Seams ◽  
Methane Drainage ◽  
Geological Conditions ◽  
Coal Reserves ◽  
Full Conversion

Methane is one of the critical safety concerns in the modern coal mining industry. The current outputs per coal faces induce risk of explosion even at low gas content of coal. Methane drainage is an obligatory component of a coal mining technology; it enables full conversion of coal resources into coal reserves, safe operation of coal mine and utilization of coal methane. The approaches to introduction of norms on methane concentration in return ventilation air and to rating of coal mines by the gas criterion in the leading coal-producing countries are reviewed. Based on the analysis of underground measurements, the content and relative releasability of are estimated as functions of the occurrence depth of coal seams in Mạo Khê mine. The methane content-occurrence depth curves are obtained. Considering the geological conditions of the mine, the promising degassing technologies based on enhancement of coal permeability are discussed, and the required modification of standards to be imposed on geological exploration data for the purpose of introduction of new methane content prediction methods is described. The main problems of pre-mine drainage of methane are examined. The urgent nature of methane drainage in Mạo Khê mine is validated.

scholarly journals Determination of methane content and methane released when exploiting longwall at different levels at 13.2 seams, Khe Cham coal mine, Vietnam

2020 ◽  
Vol 211 ◽  
pp. 03017
Author(s):  
Van Thinh Nguyen
Keyword(s):  
Coal Seam ◽  
Coal Mine ◽  
Methane Emissions ◽  
Methane Content ◽  
Methane Drainage ◽  
Gas Explosions ◽  
Two Factors ◽  
The Relationship ◽  
Different Levels

Khe Cham coal mine is managed by Ha Long Coal Company TKV. Currently, Khe Cham coal mine is exploited from the ground up to 350 and is ranked III for methane. In 2008, a methane explosion at -168 level of the 13.2 coal seam of Khe Cham coal mine occurred, injuring 16 people and killing 8. In order to avoid gas explosions at mines like 2008, it is necessary to have appropriate solutions to eliminate methane accumulation in the pit paths. We have studied to determine the relationship between the level of methane emissions with the methane content in the coal seam and the bazaar’s mining output because of the methane content in the coal seam and coal mining output. These are the two factors that greatly affect the release of methane from the longwall. The paper used practical measurement, sampling, and analysis methods to determine the level of methane emissions from longwalls at different extraction levels of the 13.2 coal seam and determine the relationship between the methane drainage and the methane content in the coal seam and the exploitation output of the longwall. This relationship is expressed by the equation y = a.x2 + b.x + c (Fig. 2 and Fig. 3). The results will help with planning for mining and have specific solutions for diluting methane in the mine’s pit lines

Quantum theory of light in nonlinear media with dispersion and absorption

1998 ◽  
Vol 45 (2) ◽  
pp. 377-402 ◽  
Author(s):  
EDUARD SCHMIDT , JOHN JEFFERS , STEPHEN M.
Keyword(s):  
Quantum Theory ◽  
Nonlinear Media
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