Exploitation Technologies of Coalbed Methane in the Qinshui Basin of China

Lü, Yanjun; Han, Jianchao; Shelepov, V. V.; Makarova, Elena Yu.; Li, K.; Chu, J.

doi:10.3103/s0145875219010125

Cited by 7 publications

(1 citation statement)

References 2 publications

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“…According to the research report of Zhu et al, the production of high coal rank coal-bed methane (CBM) has accounted for more than 90% of the total production of CBM in China. , However, due to the complex occurrence conditions of CBM − and the high metamorphic degree and generally low permeability of high-rank coal, it is difficult for its exploration and development to achieve the expected results. With the rapid growth of CBM mining technology, the current mining technologies such as hydraulic fracturing and multibranch horizontal well drainage have become the focus of CBM development. − …”

Section: Introductionmentioning

confidence: 99%

Experimental Study on the Porosity and Permeability Change of High-Rank Coal under Cyclic Loading and Unloading

Yang

Liu

et al. 2022

ACS Omega

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It is of great significance to study the evolution law and change characteristics of the porosity and permeability of coal under cyclic disturbance to efficiently exploit coal-bed methane (CBM). In this paper, the GCTS rock mechanics experimental system is applied, the unsteady gas seepage test under cyclic loading and unloading is carried out with high-grade coal samples from Zhijin County, Guizhou Province, as the research object, and the mathematical formula of the dynamic change of porosity during loading and unloading is established. The results show that (1) the porosity and permeability parameters of coal are negatively correlated with confining pressure, and all decrease with the increase in confining pressure; (2) the change rate of the porosity and permeability of bedding coal decreases gradually with the increase in stress, and the porosity and permeability under high stress decrease gradually with the increase in cycle times; (3) during cyclic loading and unloading, the permeability loss ( D k ) of coal mainly occurs in the first loading (>90%), and D k gradually decreases with the increase in cyclic times; (4) under the same test conditions, the evolution law of the porosity and permeability of parallel bedding coal and vertical bedding coal is similar but the stress sensitivity of vertical bedding coal is higher; (5) the circumferential strain of parallel bedding coal is higher than that of vertical bedding coal, and the porosity change and permeability loss show a specific bedding effect; and (6) under the action of cyclic stress, the change of strain–permeability of coal is abnormal after it is destroyed. With the increase in strain before the sample is destroyed, the permeability drops sharply, and after the sample is destroyed, the strain decreases and the permeability never recovers. The research results can provide favorable theoretical guidance and technical support for pressure relief exploitation of coal-bed methane, such as multibranch horizontal wells.

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Section: Introductionmentioning

confidence: 99%

Experimental Study on the Porosity and Permeability Change of High-Rank Coal under Cyclic Loading and Unloading

Yang

Liu

et al. 2022

ACS Omega

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Analysis of Carboniferous‐Permian coal‐accumulating environment and coalbed methane enrichment in the southern Qinshui Basin

Zhang

2024

Geological Journal

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Global research on the geological particularities of coal‐accumulating environments and the enrichment patterns of coalbed methane (CBM) is still relatively weak. This paper studies the geological characteristics and coal accumulation patterns of Carboniferous‐Permian coal‐bearing seams in the southern Qinshui Basin. The results show that the coal‐bearing strata in the basin represent the offshore marine and continental intercalated coal seam sediments developed. The southern part of the basin is dominated by lacustrine facies, and the delta front sub‐facies is locally developed. The characteristics of coal accumulation environment in the southern Qinshui Basin are characterized by basement properties, fault networks and coal‐bearing sedimentary facies, which collectively control the spatial and temporal distribution characteristics of the coal‐rich belt. The differences in coal accumulation environment in the southern basin affect the tectonic evolution, the thickness of the coal seam roof and floor and the hydrogeological conditions of the coal‐rich area, which further control the CBM enrichment in the Taiyuan‐Shanxi Formation. The aim of this study is to explore the factors of CBM enrichment and gas control mode, so as to enrich and improve the theory and method of CBM exploration, which will also help identify the appropriate underground geological structure environment for carbon sequestration (CCS), reduce greenhouse gas emissions and effectively respond to the challenge of global warming.

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A new insight into coalbed methane occurrence and accumulation in the Qinshui Basin, China

et al. 2022

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Exploitation Technologies of Coalbed Methane in the Qinshui Basin of China

Cited by 7 publications

References 2 publications

Experimental Study on the Porosity and Permeability Change of High-Rank Coal under Cyclic Loading and Unloading

Experimental Study on the Porosity and Permeability Change of High-Rank Coal under Cyclic Loading and Unloading

Analysis of Carboniferous‐Permian coal‐accumulating environment and coalbed methane enrichment in the southern Qinshui Basin

A new insight into coalbed methane occurrence and accumulation in the Qinshui Basin, China

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