Modeling and Application of Gas Pressure Measurement in Water-Saturated Coal Seam Based on Methane Solubility

Si, Leilei; Li, Zenghua; Xue, Dingzhi; Zhou, Jun‐Mei; Yang, Yongliang; Zhou, Yingbo

doi:10.1007/s11242-017-0878-0

Cited by 12 publications

(3 citation statements)

References 38 publications

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“…As is known to all, coalbed methane is mainly composed of adsorption gas and free gas. − However, Alexeev et al found that gas also occurs in the coal framework in the form of solid solution state, especially for a high pressure of >2 MPa. The solid solution gas is embedded in the coal macromolecules.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation for Pore Structure and CH₄ Release Characteristics of Coal during Pulverization Process

Yang

et al. 2017

Energy Fuels

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Qinshui coalfield is the largest coalbed methane and anthracite production base in China. In the process of mine gas prevention and control, there was a larger amount of gas that can be extracted, but even with this, the residual gas pressure is not up to standard. In this paper, in order to analyze its specific reasons, a series of experiments were carried out to investigate the pore structure, particle size distribution, and CH4 release characteristics of anthracite during the pulverization process. Results show that, compared with bituminous coal, anthracite can continuously release a certain concentration of CH4 during the pulverization process. The SEM test exhibits that anthracite possesses more secondary pores while bituminous shows more mineral pores. With the increase of total pulverizing time, the coal particle size is gradually decreased. Furthermore, compared with the pre-pulverized samples, the porosity, pore volume, and surface area of post-pulverized samples are increased, indicating that the closed pores are destroyed to be open pores during the pulverization process. In addition, by combining the gas release concentration and pore volume evolution, it can be inferred that the anthracite may contain more solid solution gas due to the fact that there is a certain amount of gas that can be released when the pore volume tends to be smooth. The research results can provide the theoretical basis for gas extraction in the anthracite mine.

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Section: Introductionmentioning

confidence: 99%

Experimental Investigation for Pore Structure and CH₄ Release Characteristics of Coal during Pulverization Process

Yang

et al. 2017

Energy Fuels

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“…In addition to the construction technology, the gas occurrence condition is also a factor affecting the accuracy of pressure measurement. The influence of coal seam water on the gas pressure measurement process was studied, and the pressure measurement method of the water-bearing coal seam was proposed according to the solubility of methane. , In addition, the development degree of coal seam pore fissures affects the process of gas pressure measurement by affecting the permeability of gas migration. , …”

Section: Introductionmentioning

confidence: 99%

Discrimination Method of Gas Pressure Measurement in Coal Seams: Physical Experiment and Model Development

et al. 2022

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Coal seam gas pressure is a key parameter of gas accident control and gas drainage. At present, there are some problems in field pressure measurement, such as long period, and there is often a need to drill more holes to ensure the reliability of pressure measurement. In this research, a physical gas pressure measurement experiment in a coal sample borehole was carried out, and a mathematical model of gas pressure evolution with time was constructed. Based on the OpenFOAM platform and C++ language, a numerical solver was developed, and the mathematical model was verified by the data of gas pressure in coal seam boreholes. The results show that the evolution process of gas pressure in coal seam boreholes can be divided into two stages. In the first stage, the gas pressure increases rapidly, and the pressure change rate decreases continuously. In the second stage, the gas pressure is slow and stable, and the pressure change rate tends to 0. The correlation coefficients between the mathematical model and the field-measured data are more than 0.94, and the calculation and prediction accuracy are high. Therefore, the model can be used to verify the field data during pressure measurement, which has better field significance and application value.

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“…Li et al [17] studied a more comprehensive mathematical model of deformation-water vapor two-phase seepage/heat transfer. Recently, a number of scholars have also carried out some innovative works on the modeling of CBM extraction considering effective stress effect and sorption induced strain [18], coal matrix block deformation [19], sorption induced swelling modification of effective stress coefficient [20], and methane solubility in water-saturated coals [21].…”

Section: Introductionmentioning

confidence: 99%

A Mathematical Model to Study the Coupling Effect of Deformation-Seepage-Heat Transfer on Coalbed Methane Transport and Its Simulative Application

Xie

Zhao

2020

Mathematical Problems in Engineering

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Injection of high-temperature water or steam into low-permeability coalbed for efficient and rapid extraction of coalbed methane has been studied by our university for many years and will soon be implemented in the field. With comprehensive consideration of coupling of heat transfer, water seepage, desorption of coalbed methane, and coal-rock mass deformation, the paper establishes a more comprehensive mathematical model of the coupling effect of deformation-seepage-heat transfer on coalbed methane transport. Compared with the previous studies, this theoretical model considers the change of adsorbed and free coalbed methane at high temperature and the coalbed methane transport caused by a high-temperature gradient. Using the Tunlan Coal Mine of Shanxi Coking Coal Group to conduct the numerical simulations on the coalbed methane extraction project using heat injection technology, results show that (1) high-temperature water flowed towards the extraction hole along fractured fissures, with seepage towards the coal mass on both sides of the fissure at the same time, gradually heating the coalbed and forming an arcuate distribution of temperature from high to low for an area from the fractured fissure to the coalbed upper and lower boundaries. On the thirtieth day of heat injection, the temperature of the coalbed in the heat injection area ranged from 140°C to 260°C. (2) Under high temperatures, desorption of the coalbed gas was quick, and the adsorption gas content formed an oval funnel from the heat injection hole towards the extraction hole, centered by the fractured fissure, and migrating towards the coalbed upper and lower boundaries. Along with heat injection and extraction, the absorbed gas content rapidly decreased, and on the thirtieth day of injection, the absorbed gas content of the entire heat injection area decreased to 1.5 m3/t, only 7% of the original. (3) During heat injection, the coalbed gas pore pressure rapidly increased and reached 5.5 MPa on the tenth day, about 4.5 times the original, and the pore pressure steadied at 3.5 MPa on the thirtieth day of extraction. Such a high gas pressure gradient promoted the rapid flow and drainage of the gas.

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Modeling and Application of Gas Pressure Measurement in Water-Saturated Coal Seam Based on Methane Solubility

Cited by 12 publications

References 38 publications

Experimental Investigation for Pore Structure and CH₄ Release Characteristics of Coal during Pulverization Process

Experimental Investigation for Pore Structure and CH₄ Release Characteristics of Coal during Pulverization Process

Discrimination Method of Gas Pressure Measurement in Coal Seams: Physical Experiment and Model Development

A Mathematical Model to Study the Coupling Effect of Deformation-Seepage-Heat Transfer on Coalbed Methane Transport and Its Simulative Application

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Modeling and Application of Gas Pressure Measurement in Water-Saturated Coal Seam Based on Methane Solubility

Cited by 12 publications

References 38 publications

Experimental Investigation for Pore Structure and CH4 Release Characteristics of Coal during Pulverization Process

Experimental Investigation for Pore Structure and CH4 Release Characteristics of Coal during Pulverization Process

Discrimination Method of Gas Pressure Measurement in Coal Seams: Physical Experiment and Model Development

A Mathematical Model to Study the Coupling Effect of Deformation-Seepage-Heat Transfer on Coalbed Methane Transport and Its Simulative Application

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Product

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Experimental Investigation for Pore Structure and CH₄ Release Characteristics of Coal during Pulverization Process

Experimental Investigation for Pore Structure and CH₄ Release Characteristics of Coal during Pulverization Process