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

Hu, Ke; Mischo, Helmut

doi:10.1007/s10450-021-00350-8

Cited by 6 publications

(2 citation statements)

References 60 publications

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“…Figure 11 shows that the adsorbed phase volume calculated by different OK models remains constant under high pressure. This result is consistent with the finding of Hu et al 59 However, due to the influence of experimental error, the adsorbed phase volume decreases in some samples under high pressure. According to the study of Ambrose et al, 60 the adsorbed phase volume can occupy the pore volume of shale, which affects the judgment of free gas occurrence space and then affects the accuracy of free gas content estimation.…”

Section: Calculation Of Absolute Adsorptionsupporting

confidence: 93%

Absolute Adsorption Calculation of Shale Gas Based on the Ono–Kondo Lattice Model

Chen

Feng

et al. 2022

Energy Fuels

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Adsorbed gas is the main occurrence state in shale gas, and its adsorption mechanism is of great significance for accurate evaluation of shale gas reserves. The adsorbed phase density is the key to accurately evaluate the adsorbed gas content. At present, there is no consensus on the adsorption mechanism of shale gas, resulting in different calculation results of adsorbed phase density, which further affects the calculation of absolute adsorption. Therefore, based on previous experimental studies on CH4 adsorption in shale at high pressure, the Ono–Kondo lattice (OK) model is used to investigate the influence of different adsorption mechanisms on the calculation of adsorbed phase density and the calculation of absolute adsorption, and the parameter range of the OK model suitable for describing the CH4 adsorption behavior in shale is determined. It is found that the modified two-layer OK model is suitable to describe the CH4 adsorption behavior in shale, and the adsorbed phase density varying with temperature and pressure can more accurately predict the CH4 absolute adsorption in shale. The CH4 adsorption mechanism in shale is two-layer adsorption. The mainstream monolayer adsorption overestimates the adsorbed phase density and underestimates the adsorbed phase volume, which leads to an underestimation of the adsorbed gas content and an overestimation of the free gas content. These conclusions are of great significance for accurate evaluation of shale gas reservoirs.

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Section: Calculation Of Absolute Adsorptionsupporting

confidence: 93%

Absolute Adsorption Calculation of Shale Gas Based on the Ono–Kondo Lattice Model

Chen

Feng

et al. 2022

Energy Fuels

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“…Birch also showed a trend of decreasing adsorption with increasing pressure after a maximum value at 303 K. Such pressure dependence has been reported for CH 4 adsorption on coal and shale(Hu and Mischo 2022; …”

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confidence: 76%

Adsorption of methane on biochar for emission reduction in oil and gas fields

Wang

et al. 2023

Biochar

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To contribute to the reduction of methane emissions, using low-cost biochar as adsorbents for capturing and storing methane in oil and gas fields is investigated. This work presents results of methane adsorption on four biochars made from forestry wastes in comparison with the results of three commercial activated carbons. Although the adsorption capacity of the biochars is lower by over 50% than that of the activated carbons, thelow-cost and potential environmental benefits provide the incentive to the investigation. Moreover, it is shown that biochar can store more methane than vessels of compressed gas up to the pressure of 75 bar, suggesting the possibility of avoiding high-pressure gas compression and heavy vessels for cost savings in oil and gas fields. The thermodynamic and kinetic behaviors of the adsorption are studied and implications for the targeted application are discussed. Graphical Abstract

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A developed dual-site Langmuir model to represent the high-pressure methane adsorption and thermodynamic parameters in shale

Hu,

Zhang,

Liu

et al. 2023

Int J Coal Sci Technol

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Comprehending the mechanism of methane adsorption in shales is a crucial step towards optimizing the development of deep-buried shale gas. This is because the methane adsorbed in shale represents a significant proportion of the subsurface shale gas resource. To properly characterize the methane adsorption on shale, which exhibits diverse mineral compositions and multi-scale pore sizes, it is crucial to capture the energy heterogeneity of the adsorption sites. In this paper, a dual-site Langmuir model is proposed, which accounts for the temperature and pressure dependence of the density of the adsorbed phase. The model is applied to the isothermals of methane adsorption on shale, at pressures of up to 30 MPa and temperatures ranging from 40 to 100 °C. The results show that the proposed model can describe the adsorption behavior of methane on shale more accurately than conventional models, which assume a constant value for the density of adsorbed phase. Furthermore, the proposed model can be extrapolated to higher temperatures and pressures. Thermodynamic parameters were analyzed using correctly derived equations. The results indicate that the widely used, but incorrect, equation would underestimate the isosteric heat of adsorption. Neglecting the real gas behavior, volume of the adsorbed phase, and energy heterogeneity of the adsorption sites can lead to overestimation of the isosteric heat of adsorption. Furthermore, the isosteric heat evaluated from excess adsorption data can only be used to make a rough estimate of the real isosteric heat at very low pressure.

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

Cited by 6 publications

References 60 publications

Absolute Adsorption Calculation of Shale Gas Based on the Ono–Kondo Lattice Model

Absolute Adsorption Calculation of Shale Gas Based on the Ono–Kondo Lattice Model

Adsorption of methane on biochar for emission reduction in oil and gas fields

A developed dual-site Langmuir model to represent the high-pressure methane adsorption and thermodynamic parameters in shale

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