Methane Adsorption on Shale: Insights from Experiments and a Simplified Local Density Model

Zuo, Liang; Wang, Yupu; Guo, Wei; Xiong, Wei; Gao, Shusheng; Hu, Zhiming; Shen, Rui

doi:10.1260/0263-6174.32.7.535

Cited by 14 publications

(12 citation statements)

References 28 publications

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“…Thus, these extensively used models are unsuitable for studying for high-pressure and ultrahighpressure methane adsorption. In the last decade, the simplified local density (SLD) model with a specific equation of state (EOS) has been extensively used to represent methane adsorption behaviors in shale [13,[34][35][36][37]. However, the SLD model produces relatively large errors at high pressures [13] and is difficult to implement in engineering applications.…”

Section: Introductionmentioning

confidence: 99%

Absolute adsorption and adsorbed volume modeling for supercritical methane adsorption on shale

Mischo

2022

Adsorption

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Adsorbed methane significantly affects shale gas reservoir estimates and shale gas transport in shale formations. Hence, a practical model for accurately representing methane adsorption behavior at high-pressure and high-temperature in shale is imperative. In this study, a reliable mathematical framework that estimates the absolute adsorption directly from low-pressure excess adsorption data is applied to describe the excess methane adsorption data in literature. This method provides detailed information on the volume and density of adsorbed methane. The obtained results indicate that the extensively used supercritical Dubinin-Radushkevich model with constant adsorbed phase density underestimates absolute adsorption at high pressure. The adsorbed methane volume increases both the pressure and expands with the temperature. The adsorbed methane density reduces above 10 MPa, and approaches a steady value at high pressure. This study provides a novel method for estimating adsorbed shale gas, which is expected improve the prediction of shale gas in place and gas production.

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Section: Introductionmentioning

confidence: 99%

Absolute adsorption and adsorbed volume modeling for supercritical methane adsorption on shale

Mischo

2022

Adsorption

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“…By contrast, some authors have taken the specific surface area as a regressed parameter depending on the adsorbed gas. 44,68 The model shows good consistency for the representation of the temperature dependence of the adsorption isotherms without any temperaturedependent parameter. Here, we used the average absolute deviation (% AAD, eq 21) to evaluate the model and experimental data.…”

Section: ■ Results and Discussionmentioning

confidence: 82%

Modeling High-Pressure Methane Adsorption on Shales with a Simplified Local Density Model

Mischo

2020

ACS Omega

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Shale gas has attracted increasing attention as a potential alternative gas in recent years. Because a large fraction of gas in shale formation is in an adsorbed state, knowledge of the supercritical methane adsorption behavior on shales is fundamental for gas-in-place predictions and optimum gas recovery. A practical model with rigorous physical significance is necessary to describe the methane adsorption behavior at high pressures and high temperatures on shales. In this study, methane adsorption experiments were carried out on three Lower Silurian Longmaxi shale samples from the Sichuan Basin, South China, at pressures of up to 30 MPa and temperatures of 40, 60, 80, and 100 °C. The simplified local density/Elliott−Suresh−Donohue model was adopted to fit the experimental data in this study and the published methane adsorption data. The results demonstrate that this model is suitable to represent the adsorption data from the experiments and literature for a wide range of temperatures and pressures, and the average absolute deviation is within 10%. The methane adsorption capacity of the Longmaxi shale exhibited a strong linear positive correlation with the total organic carbon content and a linear negative correlation with increasing temperature. The rate of decrease in the methane adsorption capacity with swing temperature increased with the total organic carbon content, indicating that the organic matter is sensitive to temperature.

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“…Montmorillonite shows IV type isotherm [19] and H3 type hysteresis loop [20] , which indicated that it has complex mesoporous structure and irregular pore structure. Shell powder, coral sand, calcite and dolomite showed I-type isotherm [21] , and there was no hysteresis loop, which indicated that they had the characteristics of microporous adsorbent [22] , and the saturated adsorption value was equal to the filling volume of micropores. In addition, the order of BET surface area (Table 4): DMP (0.16287m 2 g -1 ) < CSP (1.2361m 2 g -1 ) < CAP (2.5932m 2 g -1 ) < SHP (3.297m 2 g -1 ) < MLP (69.448m 2 g -1 ).…”

Section: Structural Advantagesmentioning

confidence: 95%

Coral sand from hydraulic reclamation for the remediation of acid sulfate soil

Zeng¹,

Hao²,

Sun³

et al. 2021

E3S Web Conf.

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For the first time, Coral sand, as the main geotechnical material in reclamation, has the characteristics of loose and porous structure, relatively small volume and mass, easy to break and high compression, and high calcium carbonate, which may be a natural material to control acid release of acid soil. In this paper, by studying the neutralization effect of coral sand under different sand ratio, particle size and adding methods, the optimal dosage and particle size of coral sand and the adding sequence were determined under typical acid soil conditions; The neutralization performance of different neutralizing materials was compared through internal structure characterization, and the structural advantages of coral sand were explored. The results show that the specific surface area of coral sand was 1.2361m2g-1, second only to calcite and shell powder. The particles were evenly distributed and can fully react with sulfuric acid to produce CaSO4 precipitation. When the addition of coral sand was 9% (Ca: S = 18:5), the PASS can be neutralized to pH > 6.5. The PASS neutralization ability of coral sand was related to particle size. The overall trend was that the smaller the particle size, the stronger the neutralization ability. The best effect was at 0.15mm, when the particle size exceeded 0.27mm, the neutralization ability began to decline.

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Methane Adsorption on Shale: Insights from Experiments and a Simplified Local Density Model

Cited by 14 publications

References 28 publications

Absolute adsorption and adsorbed volume modeling for supercritical methane adsorption on shale

Absolute adsorption and adsorbed volume modeling for supercritical methane adsorption on shale

Modeling High-Pressure Methane Adsorption on Shales with a Simplified Local Density Model

Coral sand from hydraulic reclamation for the remediation of acid sulfate soil

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