A combined stimulation technology for coalbed methane wells: Part 1. Theory and technology

Su, Xinming; Wang, Qian; Lin, Hua; Song, Jiancheng; Guo, Hongyu

doi:10.1016/j.fuel.2018.06.087

Cited by 22 publications

(14 citation statements)

References 29 publications

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“…In the first set, the adsorption of pure CH 4 was considered. In the second set, a mixture of CH 4 Figure 4a suggests that the adsorption amount increases as the pore size and pressure become larger. However, the adsorption amount of the coalbed structure with 100 Å pore size is much less than five times of that with the 20 Å pore size.…”

Section: Adsorption Isothermsmentioning

confidence: 97%

“…Graphene, or a single layer of carbon rings, was often used as a simplified model for coal in previous studies [5,9,35]. In this work, CH 4 and H 2 O adsorptions on graphene were tested in order to validate our computational methods, as well as to provide a baseline for the binding affinity to CH 4 and H 2 O.…”

Section: Ch 4 and H 2 O Adsorption On Graphenementioning

confidence: 99%

“…A report by Mastalerz et al shows that, in 2014, the global CBM production reached over 240 billion cubic meters [2]. Despite its large production and considerable economic value, CBM is fundamentally different from the conventional gas, and its production put forward numerous scientific and technical challenges [3,4]. It is generally presumed that gas holding capacity and permeability are two important factors which characterize a CBM reservoir.…”

Section: Introductionmentioning

confidence: 99%

“…Adsorption isotherms of (a) CH 4 and (b) CH4 and H 2 O in the coalbed model. Blue, red, and black lines refer to the models with 100 Å, 60 Å, and 20 Å pore sizes, respectively.…”

mentioning

confidence: 99%

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A Multi-Scale Modeling of CH4 and H2O Adsorption on Coal Molecules and the Water Blocking Effect in Coalbed Methane Extraction

Yang¹,

Li³

et al. 2019

Applied Sciences

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Coalbed methane (CBM) is of great economic value. However, at the same time, CBM is facing a multitude of technological challenges. The water blocking effect (WBE) is one of the physical effects that controls the production of CBM. To alleviation WBE, it is necessary to study its mechanisms at the molecular level. In this study, we used a combined first-principles calculation and molecular simulation approach to investigate the adsorption and diffusion of both methane and water in coal. The results suggest that water does not compete with methane in the adsorption on coal surfaces, yet the presence of water significantly slows down the diffusion of methane within the micropores of coal. This work not only explains the fundamental mechanisms of the WBE but also provides a simulation framework for building strategies to alleviate WBE.

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Section: Adsorption Isothermsmentioning

confidence: 97%

Section: Ch 4 and H 2 O Adsorption On Graphenementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…Adsorption isotherms of (a) CH 4 and (b) CH4 and H 2 O in the coalbed model. Blue, red, and black lines refer to the models with 100 Å, 60 Å, and 20 Å pore sizes, respectively.…”

mentioning

confidence: 99%

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A Multi-Scale Modeling of CH4 and H2O Adsorption on Coal Molecules and the Water Blocking Effect in Coalbed Methane Extraction

Yang¹,

Li³

et al. 2019

Applied Sciences

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“…As much more attention paid to industrial safety and environment protection, approximately 20 000 CBM wells were drilled throughout the past decades, and the production of CBM has dramatically increased to 7.02 × 10 9 m 3 with an growth rate of 8.2% in 2017 . Unfortunately, only 1/4 of these wells have achieved the commercial gas production of over 1000 m 3 /d due to the insufficient resource intensity and limitations of reservoir stimulation technologies . Gas recovery from deep underground coal mine seems a promising solution for the energy crisis.…”

Section: Introductionmentioning

confidence: 99%

Optimal submerged waterjet for gas recovery based on Arbitrary Lagrange‐Euler

Wang

Hai

et al. 2019

Energy Science & Engineering

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This paper proposes a coupled model of waterjet cutting coal containing gas with the Arbitrary Lagrange‐Euler algorithm assistance. The dynamic evolution of coal damage and the cutting performance under different jet conditions, including jet pattern (submerged/nonsubmerged state), jet velocity, nozzle diameter, and the initial standoff distance, are investigated by tracing the number of failure elements and the stress distribution. Afterward, the gas flow model is built to study interactions of the discharged coal amount and the effective drainage radius at different periods with COMSOL software. The numerical results show the coal cutting performance of nonsubmerged jets is much better than that of submerged jets. Under submerged conditions, the penetration length increases with jet velocity and nozzle diameter, but decreases with the initial standoff distance. Moreover, the effective drainage radius of nonsubmerged waterjet is substantially greater than that of submerged jet. The increasing trend of the effective drainage radius slows down after 3 months with gas flow attenuation. Under the special submerged circumstances, the difference of coal cutting performance caused by the two jet patterns should be fully considered in order to reasonably arrange the spacing of boreholes.

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Theory and Application of Pseudo-Reservoir Hydraulic Stimulation for Coalbed Methane Indirect Extraction in Horizontal Well: Part 1—Theory

Wang

et al. 2020

Nat Resour Res

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A combined stimulation technology for coalbed methane wells: Part 1. Theory and technology

Cited by 22 publications

References 29 publications

A Multi-Scale Modeling of CH4 and H2O Adsorption on Coal Molecules and the Water Blocking Effect in Coalbed Methane Extraction

A Multi-Scale Modeling of CH4 and H2O Adsorption on Coal Molecules and the Water Blocking Effect in Coalbed Methane Extraction

Optimal submerged waterjet for gas recovery based on Arbitrary Lagrange‐Euler

Theory and Application of Pseudo-Reservoir Hydraulic Stimulation for Coalbed Methane Indirect Extraction in Horizontal Well: Part 1—Theory

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