Sorption of carbon dioxide, methane and nitrogen in dry coals at high pressure and moderate temperature

Pini, Ronny; Ottiger, Stefan; Burlini, L.; Storti, Giuseppe; Mazzotti, Marco

doi:10.1016/j.ijggc.2009.10.019

Cited by 127 publications

(114 citation statements)

References 72 publications

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“…A greater pressure is needed for the excess adsorption to approach zero for the adsorption at a higher temperature. All these characteristics of methane adsorption on our samples are consistent with those of coals and shales reported in the literature (e.g., Bae and Bhatia, 2006;Sakurovs et al, 2007;Pini et al, 2010;Rexer et al, 2013;Gensterblum et al, 2014;Bruns et al, 2016). Fig.…”

Section: Isothermal Adsorption Curve and Data Fittingsupporting

confidence: 91%

“…(2) by the SDR model. This assumption has been confirmed by experimental data (Murata et al, 2001;Krooss et al, 2002;Sudibandriyo et al, 2003;Ottiger et al, 2006;Bae and Bhatia, 2006;Pini et al, 2006Pini et al, , 2010Chareonsuppanimit et al, 2012;Rexer et al, 2013).…”

Section: Excess Adsorption and Absolute Adsorptionsupporting

confidence: 64%

“…For all samples, the experimental temperature was 60 C. Five extra temperature points (40,80,100,120, and 150 C) were measured for Sample 8 to construct the relationship between adsorbed gas capacity and burial depth. The detailed experimental procedures for the magnetic suspension balance equipment have been well documented in previous publications (Giovanni et al, 2001;Ottiger et al, 2008;Pini et al, 2006Pini et al, , 2010Gasparik et al, 2014b).…”

Section: Samples and Experimentsmentioning

confidence: 99%

“…According to the Gibbs adsorption model (Murata et al, 2001(Murata et al, , 2002Bae and Bhatia, 2006;Ottiger et al, 2006;Pini et al, 2010), excess adsorption is related to absolute adsorption through the following equation: Liu et al, 2009;Hu et al, 2014;Zhai, 2014). …”

Section: Excess Adsorption and Absolute Adsorptionmentioning

confidence: 99%

“…The Langmuir model is based on assumptions of homogeneous pore structure, monolayer adsorption, and lack of interaction between gas molecules (Langmuir, 1918;Ambrose et al, 2012;Zhang et al, 2012b;Gensterblum et al, 2014). This model has been improved to be a classical adsorption model and is widely used to investigate the adsorption characteristics of coal and shale (Sakurovs et al, 2007;Pini et al, 2010;Gensterblum et al, 2009;Gasparik et al, 2012Gasparik et al, , 2014a). The SDR model was developed on the basis of the classical DubininRadushkevich (DR) equation, which was originally established for low-pressure subcritical adsorption (Gregg and Sing, 1982;Dubinin, 1989;Clarkson et al, 1997).…”

Section: Excess Adsorption and Absolute Adsorptionmentioning

confidence: 99%

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Geological models of gas in place of the Longmaxi shale in Southeast Chongqing, South China

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Section: Isothermal Adsorption Curve and Data Fittingsupporting

confidence: 91%

Section: Excess Adsorption and Absolute Adsorptionsupporting

confidence: 64%

Section: Samples and Experimentsmentioning

confidence: 99%

Section: Excess Adsorption and Absolute Adsorptionmentioning

confidence: 99%

Section: Excess Adsorption and Absolute Adsorptionmentioning

confidence: 99%

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Geological models of gas in place of the Longmaxi shale in Southeast Chongqing, South China

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et al. 2016

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Coupling of swelling, internal stress evolution, and diffusion in coal matrix material during exposure to methane

2017

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We construct theoretical models for time‐dependent swelling of coal matrix material upon adsorption of a single gas, taking into account a coupling between stress, strain, chemical potential, and diffusion. Two models are developed. The first (model A) corresponds to diffusion and hence swelling rates being controlled by the jump frequency of adsorbed molecules between closely spaced adsorption sites and the second (model B) to transport controlled by diffusion of unadsorbed molecules through diffusion paths linking distant adsorption sites. To test these models, we performed axial swelling experiments on a single 4 mm sized cylindrical sample of medium volatile bituminous coal, exposed to CH4 at pressures up to 40 MPa, at 40°C, using 1‐D, high‐pressure dilatometry. The models were calibrated to the experimental data by adjustment of a single‐valued diffusion coefficient, independent of gas pressure and adsorbed concentration. The results show that the data can be accurately explained only by model B. The implication is that the gas transport, the associated adsorption, and hence time‐dependent swelling are controlled by the diffusion of unadsorbed molecules and not by molecules jumping between the adjacent adsorption sites. Our model describes a full coupling between stress, strain, sorption, and diffusion in coal matrix material in terms of parameters that have clear physical meaning and are easily obtained from sorption and swelling experiments on coal of any rank exposed to any gas. It therefore offers an important tool for modeling permeability evolution with time during (enhanced) coalbed methane operations.

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Leakage Processes in Damaged Shale

Carey

Pini

Prasad

et al. 2018

Geological Carbon Storage

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Sorption of carbon dioxide, methane and nitrogen in dry coals at high pressure and moderate temperature

Cited by 127 publications

References 72 publications

Geological models of gas in place of the Longmaxi shale in Southeast Chongqing, South China

Geological models of gas in place of the Longmaxi shale in Southeast Chongqing, South China

Coupling of swelling, internal stress evolution, and diffusion in coal matrix material during exposure to methane

Leakage Processes in Damaged Shale

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