Environmental Risk Related to the Exploration and Exploitation of Coalbed Methane

Uliasz-Misiak, B.; Misiak, Jacek; Lewandowska-Śmierzchalska, Joanna; Matuła, Rafał

doi:10.3390/en13246537

Cited by 7 publications

(3 citation statements)

References 29 publications

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“…Coal extraction releases methane that is self-generated and stored in coal pores during mining operations [8,9]. Methane is the second most abundant anthropogenic greenhouse gas, and it is 23 times more pollutant than carbon dioxide [10]. Moreover, its flammable nature makes it the main hazard to mining operations.…”

Section: Introductionmentioning

confidence: 99%

Experimental Comparison of Functionality between the Main Types of Methane Measurement Sensors in Mines

et al. 2023

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In recent years, coal mine methane measurement techniques in mines have been gaining importance as poor firedamp control in work can cause the interruption of production and even fatal accidents. Since there is currently a variety of methane measurement equipment with different functional characteristics and measurement principles, a study is needed to indicate which type of equipment has the highest degree of confidence. This research presents the results of a study carried out by the Official Laboratory J. M. Madariaga (LOM) of the Polytechnic University of Madrid that aims to analyze the reliability of methane detection systems used in underground mining. Therefore, a series of portable and non-portable methane detectors with different measurement principles have been selected to subject them to laboratory tests following the methods described in the applicable regulations, such as time of response, dust effect, temperature, pressure, etc. The test equipment is usually the one used in the certification and calibration of these devices, subject to the LOM quality system. The results of these tests allowed for defining a marking system that led to a ranking of the tested methane detectors in order to find the advantages and disadvantages of each type. From the performed tests, a summary of the main sources of sensor inaccuracy was reported. It was found that catalytic sensors might present significant deviations when testing high concentrations in short periods of time or low concentrations during long periods of time. On the other hand, devices with an interferometric sensor can be unreliable as the measures are very sensitive to changes in environmental conditions, and optical sensors present longer response times than catalytic sensors.

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Section: Introductionmentioning

confidence: 99%

Experimental Comparison of Functionality between the Main Types of Methane Measurement Sensors in Mines

et al. 2023

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“…With the continuous consumption of energy and the gradual intensification of the greenhouse effect, coalbed methane (CBM), a high-quality clean unconventional energy, has been of wide concern. − In China, exploration and development techniques are critical for improving the production of CBM, and U-, V-, and L-shaped horizontal wells and multilateral horizontal wells have been favored for CBM . Coal is a complex medium with a dual pore structure and is composed of a coal matrix and pores/fractures. , The pore specific surface area and fracture volume of coal provide sufficient storage and migration space for CBM .…”

Section: Introductionmentioning

confidence: 99%

“…With the continuous consumption of energy and the gradual intensification of the greenhouse effect, 1 coalbed methane (CBM), a high-quality clean unconventional energy, has been of wide concern. 2 − 4 In China, exploration and development techniques are critical for improving the production of CBM, 5 and U-, V-, and L-shaped horizontal wells and multilateral horizontal wells have been favored for CBM.…”

Section: Introductionmentioning

confidence: 99%

Relationship between Dielectric Relaxation Time and Permeability of High-Rank Coal in the Jiaozuo Mining Area

Zhang

Lei

2022

ACS Omega

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To evaluate the permeability of coal by the complex resistivity method, the real part of complex resistivity (R), the imaginary part of complex resistivity (X), capacitance (C), permeability (k), and strain (ε) of coal in different directions under variable pressure were measured. Based on the physicochemical structure characteristics of coal and its conductivity and dielectric mechanism, the experimental phenomenon was analyzed and correlated with the permeability of coal. The results demonstrated that (1) the R–X curve is U-shaped. With increasing frequency, the amplitude first decreases and then increases, forming an obvious trough. C decreases with increasing frequency. (2) The R–X curve is affected by pressure and directivity. The absolute value of the R–X curve amplitude gradually decreases and shifts to the left as the pressure increases; meanwhile, it decreases and shifts to the left in the order of the vertical bedding direction (z direction), the vertical main fracture direction in parallel bedding (y direction), and the main fracture direction in parallel bedding (x direction). There is also a related change law for C. (3) The dielectric relaxation time (τ) was optimized as the electrically sensitive parameter of coal. τ continues to decrease as pressure increases and decreases in the order of the z, y, and x directions. (4) The permeability of coal is strongly correlated with the dielectric relaxation time, and the relationship between them conforms to a logarithmic function. The relationship of strain and the dielectric relaxation time verifies the strong correlation between permeability and the dielectric relaxation time. This study provides an experimental basis and theoretical support for the subsequent accurate prediction and evaluation of coal permeability using the dielectric relaxation time.

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Impact of liquid nitrogen freeze–thaw on multistage gas flow: differences between shallow and deep coal in Qinshui Basin

Sun

Zhao

et al. 2023

Geomech. Geophys. Geo-energ. Geo-resour.

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Liquid nitrogen freeze–thaw (LNFT) is an environmentally-friendly permeability enhancement technology. There are significant differences between shallow and deep coal in their composition and stress history. Therefore, it is necessary to reveal the difference in the impact of LNFT on the multistage gas flow between shallow and deep coal. In this paper, the differences in multistage gas flow were revealed from the perspective of a multiscale structure evolution, and the differences in the multiscale structure evolution were analyzed from the coal compositions and stress history. Nuclear magnetic resonance method was used in the multiscale structure evolution characterization. As for the multistage gas flow evolution, gas ad/de-sorption, diffusion, and seepage evolution characterization were investigated. There is a quadratic relationship between the total porosity and LNFT cycles in both shallow and deep coal. The fracture expansion is dominant in deep coal, while pores connectivity enhancement is dominant in shallow coal. The permeability of both shallow and deep coal increases during the LNFT cycling, presenting a logarithmic correlation between permeability and the number of cycles. With the same porosity, shallow coal has a higher permeability. LNFT cycling can improve the Langmuir volume. Langmuir volume and gas diffusion coefficients of deep coal is smaller both pre- and post-LNFT cycling. Except for CH4 in deep coal, the Langmuir pressure and gas diffusion coefficients in both coals are improved by LNFT cycling.

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Environmental Risk Related to the Exploration and Exploitation of Coalbed Methane

Cited by 7 publications

References 29 publications

Experimental Comparison of Functionality between the Main Types of Methane Measurement Sensors in Mines

Experimental Comparison of Functionality between the Main Types of Methane Measurement Sensors in Mines

Relationship between Dielectric Relaxation Time and Permeability of High-Rank Coal in the Jiaozuo Mining Area

Impact of liquid nitrogen freeze–thaw on multistage gas flow: differences between shallow and deep coal in Qinshui Basin

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