Effect of adsorption-induced matrix deformation on coalbed methane transport analyzed using fractal theory

Zhou, Yinbo; Li, Zenghua; Yang, Yongliang; Wang, Mian; Gu, Fanjun; Ji, Hongmei

doi:10.1016/j.jngse.2015.07.013

Cited by 24 publications

(7 citation statements)

References 31 publications

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“…Coal measure strata in China are mostly stored in coal seam group conditions. Affected by multiple geological structures, the coal structure becomes complex, with the characteristics of a soft coal body and low permeability 9–13 . Therefore, it is difficult to directly pre‐drain gas from primary coal seams.…”

Section: Introductionmentioning

confidence: 99%

“…Affected by multiple geological structures, the coal structure becomes complex, with the characteristics of a soft coal body and low permeability. [9][10][11][12][13] Therefore, it is difficult to directly pre-drain gas from primary coal seams. The protective layer mining technology effectively solves the problem of difficult pre-extraction of primary coal seams.…”

Section: Introductionmentioning

confidence: 99%

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Study on stress evolution law of upper coal seam in long‐distance advance mining of lower coal seam

Fang

Sun

et al. 2023

Energy Science & Engineering

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With the shift of coal resources to deep mining, the occurrence of longdistance coal seams has increased, and protective layer mining is facing new challenges. This paper attempts to explain the stress evolution law of the upper coal group in the long-distance mining of the lower coal group in Pingdingshan No. 8 Coal Mine. A simulation model of advance mining of lower-group coal long-distance was established. The stress evolution law of the upper coal seam under the influence of advanced mining disturbance of the lower coal seam is studied. The following conclusions were obtained: The advance mining of the lower coal group had a positive or negative impact on the stress distribution of the upper coal seam group. With the recovery of the lower coal group of the F-21030 working face, the overburden of the F-21030 goaf finally formed a "Y" type pressure relief area. The pressure relief effect of the E-21070 working face near the stopping line was obvious. The coal seam of Group E was divided into three areas affected by the advance mining of the lower coal seam. The maximum pressure relief value was 6.6% lower than the initial stress.According to the simulation results, the E-21070 working face was divided into three regions, namely, the pressure relief region, the stress increase region, and the original stress region. According to the field drainage results of pressure relief gas, the extraction curve could be divided into three parts, namely, the stable area, pressure relief area, and stress recovery area. The maximum pure gas drainage volume could reach seven to eight times of the original area. The pressure relief extraction effect was remarkable, and the optimal extraction range was 22-210 m behind the coal face of the group.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Study on stress evolution law of upper coal seam in long‐distance advance mining of lower coal seam

Fang

Sun

et al. 2023

Energy Science & Engineering

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“…Wang et al [5] pointed out that the coal seam gas predrainage is the most efficient way to eliminate the risk associated with coal and gas burst. Chen et al [6][7][8] carried out research to investigate the permeability of the coal seam during mining operation and hence revealed that such a permeability would increase significantly due to the effect of stress relief and fractures in the seam resulted by mining activities. Nima et al [9] identified the creep behaviour of the coal seam playing a significant role in the permeability of coal seam and gas drainage.…”

Section: Introductionmentioning

confidence: 99%

Stress Distribution and Gas Concentration Evolution during Protective Coal Seam Mining

Niu

Shi

Zhang

et al. 2021

Advances in Civil Engineering

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Coal and gas burst is one of the significant and catastrophic hazards in underground longwall operations. To date, the protective coal seam mining has been recognized as the most effective mining method for minimizing or even avoiding the effect of the coal and gas burst. In this paper, numerical modelling and field test were carried out for the longwall operation in Qidong Coal Mine in order to investigate the induced stress and coal seam gas drainage performance in the protected coal seam after the complete extraction of the protective coal seam. It was found that four stress zones can be classified in the protected coal seam being the original stress zone, stress concentration zone, stress relief zone, and recompaction zone. In addition, the monitoring data of gas concentration and volume change in the field agree well with the numerical modelling results.

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“…It not only describes pore heterogeneity qualitatively, but also characterizes pore roughness quantitatively. 19,20 Fractal theory has been widely implemented in the field of petroleum exploration and development, especially in the study of reservoir micro-pore structure. It has developed into a Fractal Nature of Porosity in Volcanic Tight Reservoirs simple and effective way to quantitatively characterize the heterogeneity and complexity of pore structure in low permeability reservoirs.…”

Section: Introductionmentioning

confidence: 99%

Fractal Nature of Porosity in Volcanic Tight Reservoirs of the Santanghu Basin and Its Relationship to Pore Formation Processes

Wang

Chen

et al. 2018

Fractals

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In this paper, in a case study of Santanghu Basin in China, the morphological characteristics and size distribution of nanoscale pores in the volcanic rocks of the Haerjiawu Formation were investigated using the results of low temperature nitrogen adsorption experiments. This research showed that within the target layer, a large number of nanoscale, eroded pores showed an "ink bottle" morphology with narrow pore mouths and wide bodies. The fractal dimension of pores increases gradually with increasing depth. Moreover, as fractal dimension increases, BET-specific surface area gradually increases, average pore diameter decreases and total pore volume gradually increases. The deeper burial of the Haerjiawu volcanic rocks in the Santanghu Basin leads to more intense erosion by organic acids derived from the basin's source rocks. Furthermore, the internal surface roughness of these corrosion pores results in poor connectivity. As stated above, the corrosion process is directly related to the organic acids generated by the source rock of the interbedded volcanic rocks. The deeper the reservoir, the more the organic acids being released from the source rock. However, due to the fact that the Haerjiawu volcanic rocks are tight reservoirs and have complicated pore-throat systems, while organic acids dissolve unstable minerals such as feldspars which improve the effective reservoir space; the dissolution of feldspars results in the formation of new minerals, which cannot be expelled from the tight reservoirs. They are instead precipitated in the fine pore throats, thereby reducing pore connectivity, while enhancing reservoir micro-preservation conditions.

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Effect of adsorption-induced matrix deformation on coalbed methane transport analyzed using fractal theory

Cited by 24 publications

References 31 publications

Study on stress evolution law of upper coal seam in long‐distance advance mining of lower coal seam

Study on stress evolution law of upper coal seam in long‐distance advance mining of lower coal seam

Stress Distribution and Gas Concentration Evolution during Protective Coal Seam Mining

Fractal Nature of Porosity in Volcanic Tight Reservoirs of the Santanghu Basin and Its Relationship to Pore Formation Processes

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