Influence of temperature on gas desorption characterization in the whole process from coals and its application analysis on outburst risk prediction

Li, Xiaowei; Wang, Chaojie; Chen, Yujia; Li, Haonan

doi:10.1016/j.fuel.2022.124021

Cited by 16 publications

(3 citation statements)

References 26 publications

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“…Many scholars have studied the influencing factors of this index and achieved fruitful results (Chen et al, 2012;Meng and Li, 2016;Du et al, 2020;Li et al, 2022;Lu et al, 2022). The effects of adsorption pressure, firmness coefficient, volatile matter, adsorption equilibrium time, and particle size on the initial velocity of gas diffusion have also been studied (Jianning, 2010;Xu and Jiang, 2011;Tan et al, 2012;Xu and Jiang, 2012;Yanwei and Mingju, 2015;Yang et al, 2022).…”

Section: Introductionmentioning

confidence: 99%

Determination of initial velocity of gas diffusion under temperature control

Shang

Weng²,

Wen³

et al. 2023

Front. Earth Sci.

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Introduction: The initial velocity of gas diffusion (ΔP) of coal is an important index to characterize the outburst risk of coal, and temperature is an important factor affecting the determination of initial velocity of gas diffusion. However, how to control the temperature during ΔP determination remains a significant challenge. Methods: In this paper, an experimental system for ΔP testing under temperature-controlled conditions was constructed, and the effect of temperature on the ΔP determination results was further explored by accurately controlling the temperature of the testing system. Results: The results show that the temperature change will affect the determination result of ΔP in the range of 13°C–40°C, and the determination results do not show obvious regularity. Discussion: The main reasons for the analysis are as follows: during the determination of ΔP, although the higher the temperature is, the faster the speed of gas diffusion and the greater the amount of gas diffusion and the pressure produced in the first 60 s, but the smaller the amount of gas adsorption before release. There is a situation of mutual offset between the two, resulting in the fluctuation of ΔP determination results. It is concluded that the temperature change will affect the determination of the initial velocity of gas diffusion, and when ΔP is measured, the temperature of the experimental system should be consistent with the actual temperature of the sampled coal body as far as possible, so as to increase the reliability of the measured results for the prediction of coal and gas outburst. This paper provides an experimental basis for clarifying the industry standard of temperature related to ΔP.

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Section: Introductionmentioning

confidence: 99%

Determination of initial velocity of gas diffusion under temperature control

Shang

Weng²,

Wen³

et al. 2023

Front. Earth Sci.

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“…The national standard “Method for direct downhole determination of coal seam gas content” (GB/T23250-2009) prefers the coring tube sampling method. The frictional heat generated between the tube wall and the coal wall during coring and the cutting heat generated between the coring tube coring bit and the cutting coal body will cause the temperature of the coal core to rise, resulting in excessive gas loss during the sampling process, and the deduced gas loss will have a large deviation from the actual gas loss, thus causing the inaccurate measured value of coal seam gas content. – Temperature is one of the important factors affecting gas desorption. – Wang and Yue et al – proposed a freezing coring technique based on the temperature drop response characteristics of gas-bearing coal cooling and desorption inhibition, which aims to block the heating of the coal body by the frictional and cutting heat of the coring tube and reduce the temperature of the coal body at the same time, thus reducing the amount of gas loss during the sampling process and improving the accuracy of the coal seam gas content measurements.…”

Section: Introductionmentioning

confidence: 99%

Low-Temperature Response Characteristics of Coalbed Methane Desorption under High and Low Destruction Degrees

Zhu,

Wang,

Liang

2023

ACS Omega

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Freeze-coring technology can effectively reduce the amount of gas loss during the sampling process and improve the accuracy of gas content measurements in underground coal seams. In this study, high-and low-damage coals were selected as test objects to investigate whether the freezecoring technique is universally applicable to inhibit gas desorption in high-and low-damage coals. In this paper, the pore structure of the test coal samples was first tested using an ASAP2020 specific surface area analyzer, and then a nonfreezing and freezing simulation test was carried out on high-and low-damage coals using a self-developed freezing coring response test platform. The results showed that the gas desorption curves of both high-and low-damage coal samples followed the pattern of rapid increase in the early stage, slow increase in the middle stage, and stability in the late stage under both conditions; freezing conditions significantly reduced the gas desorption during the sampling process, and the difference in gas desorption between high-and low-damage coals was reduced; the gas desorption inhibition rate of high-damage coals was higher at an external heating temperature of 60 °C under freezing conditions; at an external heating at an external heat temperature of 90 °C, the gas desorption inhibition rate of low-damaged coal was higher in the early stage, and the gas desorption inhibition rate of high-damaged coal was higher in the later stage; freeze coring had a significant inhibition effect on the gas desorption of both high-and low-damaged coal types, which verified that the inhibition effect of freeze coring on the gas desorption of high-and low-damaged coal samples was universal. It provides a basis for the future application of freeze-coring technology in coal mines.

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“…Clearly, the higher the coal rank, the slower the desorption rate decays and the longer the desorption time. The former studies showed that the reservoir temperature, , pressure, and internal factors, such as coal metamorphism, structure, rock, quality, , and pore structure, , are dominant factors that could influence the desorption characteristics.…”

Section: Introductionmentioning

confidence: 99%

Characteristics and Influence Factors of Natural Desorption in Coal Bodies from Fukang Mining Area, Xinjiang, China

Du,

Huang,

Wang

et al. 2023

ACS Omega

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Coal body desorption characteristics are one of the key factors that influence the development of coalbed methane (CBM). In this study, 91 coal core samples from 11 CBM wells in the Fukang mining area were collected from Xinjiang, China, and the coal quality, high-pressure mercury compression, gas content, and natural desorption characteristics measurements were launched. With the detailed analyses of the differences in cumulative desorption volume, desorption ratio, and on-site average desorption rate for the coal samples with different body structures and macrolithotypes, the influence of the maximum reflectance of vitrinite, microscopic coal rock composition, and coal quality and pore characteristics on CBM desorption characteristics were discussed. The results showed that the cumulative desorption volume, desorption ratio, and desorption rate of cataclastic structure-bright coal are higher than those of primary structure-semibright coal. With the increase of R O,max and vitrinite content, the adsorption capacity of coal increases, and the increased methane concentration difference during desorption leads to an increase in cumulative desorption volume and on-site average desorption rate. The higher contents of moisture and ash yield would occupy the adsorption sites and hinder gas diffusion, which would decrease the desorption of coalbed methane. The greater porosity/pore volume ratio of medium and large pores can enhance the connectivity of pores, which increases the desorption ratio and the average desorption rate, while the higher micropore porosity/pore volume ratio can increase the gas adsorption space and the cumulative desorption volume. The pore characteristics have the most significant effect on the cumulative desorption volume and desorption ratio. The results of the study can help guide coal mine gas management and CBM development from middle-and low-rank coal reservoirs in Xinjiang.

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Influence of temperature on gas desorption characterization in the whole process from coals and its application analysis on outburst risk prediction

Cited by 16 publications

References 26 publications

Determination of initial velocity of gas diffusion under temperature control

Determination of initial velocity of gas diffusion under temperature control

Low-Temperature Response Characteristics of Coalbed Methane Desorption under High and Low Destruction Degrees

Characteristics and Influence Factors of Natural Desorption in Coal Bodies from Fukang Mining Area, Xinjiang, China

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