Swelling of shale in supercritical carbon dioxide

Lu, Yiyu; Ao, Xiang; Tang, Jiren; Jia, Yunzhong; Zhang, Xinwei; Chen, Yuting

doi:10.1016/j.jngse.2016.02.011

Cited by 134 publications

(75 citation statements)

References 25 publications

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“…Several predictive approaches have also been developed to describe the strain induced by volumetric swelling from CO 2 adsorption based on the lattice gas DFT and the simplified local density model, with the goal of modeling CO 2 sorption isotherms and subsequent changes in porosity and induced strain as a function of the temperature, CO 2 pressure, and rock mechanical properties. A key parameter, λ* (λ* ≤ 0), is the strain energy, and it provides a link between fluid sorption and solid deformation.…”

Section: Geochemical Reactionsmentioning

confidence: 99%

“…For λ* = 0, solid deformation does not occur upon sorption, but as the absolute value of λ* increases, solid deformation attributable to CO 2 ‐adsorption increases. Structural changes in the clay matrix can lead to adsorption–desorption hysteresis . Volumetric swelling‐induced strain is anisotropic because of the intrinsic anisotropy of clays, as well as the mismatch in mechanical properties between the matrix and the fluid phase .…”

Section: Geochemical Reactionsmentioning

confidence: 99%

“…Structural changes in the clay matrix can lead to adsorption-desorption hysteresis. 53,54 Volumetric swelling-induced strain is anisotropic because of the intrinsic anisotropy of clays, as well as the mismatch in mechanical properties between the matrix and the fluid phase. 53,54 In addition, this strain decreases as the temperature increases.…”

Section: Co 2 Adsorption In Swelling Claysmentioning

confidence: 99%

See 2 more Smart Citations

A review of geochemical–mechanical impacts in geological carbon storage reservoirs

et al. 2019

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Geological carbon storage (GCS) refers to the technology of capturing man‐made carbon dioxide (CO2) emissions, typically from stationary power sources, and storing such emissions in deep underground reservoirs. GCS is an approach being explored globally as a defense mechanism against climate change projections, although it is not without its critics. An important focus has been recently placed on understanding the coupling between rock–fluid geochemical alterations and mechanical changes for CO2 storage schemes in saline aquifers. This article presents a review of the current state of knowledge regarding CO2‐induced geochemical reactions in subsurface reservoirs, and their potential impact on mechanical properties and microseismic events at CO2 storage sites. This review focuses, in particular, on the current state of the art in fluid–rock interactions within the GCS context. Key issues to be addressed include geochemical reactions and the alteration of transport and mechanical properties. Specific review topics include the swelling of clays, the prediction of dissolution and precipitation reaction rates, CO2‐induced changes in porosity and permeability, constitutive models of chemo–mechanical interactions in rock, and correlations between geochemical reactions and induced seismicity. The open questions in the field are emphasized, and new research needs are highlighted. © 2019 Society of Chemical Industry and John Wiley & Sons, Ltd.

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Section: Geochemical Reactionsmentioning

confidence: 99%

Section: Geochemical Reactionsmentioning

confidence: 99%

Section: Co 2 Adsorption In Swelling Claysmentioning

confidence: 99%

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A review of geochemical–mechanical impacts in geological carbon storage reservoirs

et al. 2019

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“…Lyu et al (2015) summarized the H 2 O adsorption swelling of shale, and presented the volume swelling of shale is negatively related to the initial water content and the logarithm of confining stress, but is positively proportional to clay content. Lu et al (2016) tested the shale swelling in supercritical CO 2 , and found that the swelling initially increases but subsequently decreases with increasing pressure; maximum swelling decreases with the increase in measured temperature.…”

Section: Matrix Shrinkagementioning

confidence: 99%

Insights on the gas permeability change in porous shale

Chen

Xu³

et al. 2017

Adv. Geo-Energ. Res.

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Due to abundant nanoscale pores developed in shale, gas flow in shale presents a complex dynamic process. This paper summarized the effects from effective stress increase, shale matrix shrinkage, gas slippage and Knudsen diffusion on the gas permeability change in shale during shale gas recovery. With the reduce in gas pressure, effective stress increase leads to the decline of the permeability in an exponential form; the permeability increases due to the shale matrix shrinkage induced by gas desorption; appearances of gas slippage and Knudsen diffusion cause an additional increase in the gas permeability particularly in small pores at low pressures. In addition, some reported models evaluating the shale permeability were reviewed preliminarily. Models considering these four effects may be potentially effective to evaluate the gas permeability change in shale.

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“…We should note that low gas pressure should be used when testing adsorptive rocks due to the assumption of linear adsorption. In addition, gas desorption may induce matrix shrinkage which potentially increases the rock permeability . For these reasons, it is advisable to use nonadsorptive gases when testing rock permeability with CDT method.…”

Section: Parametric Study and Discussionmentioning

confidence: 99%

A method for simultaneously determining axial permeability and transverse permeability of tight reservoir cores by canister degassing test

Zhao

Wang

2019

Energy Science & Engineering

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Permeability anisotropy of shale and tight gas reservoirs is critical for applications in unconventional gas recovery, but laboratory measurements are still limited. This paper presents an experimental method for determining permeability anisotropy of shale and tight reservoirs. The method uses gas production data from a canister and an analytical solution of continuity equation in anisotropic core sample. Axial permeability and transverse permeability of the core are estimated by matching experimental data with analytical solution. The proposed method is verified by comparing with true values and calculated values through numerical simulations that cover variations in rock permeability. The method is applied to real data measured in canister degassing tests (CDT) involving two different directional shale core samples. Then, the experimental results are compared with the results from pulse pressure decay (PPD) method. Both the verification from numerically calculated results and the comparison between PPD results and CDT results exhibit the practicality of the proposed method. At last, the effects of permeability anisotropy, porosity, initial gas pressure, rock dimensions, and adsorption on the profiles of gas production are investigated.

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Swelling of shale in supercritical carbon dioxide

Cited by 134 publications

References 25 publications

A review of geochemical–mechanical impacts in geological carbon storage reservoirs

A review of geochemical–mechanical impacts in geological carbon storage reservoirs

Insights on the gas permeability change in porous shale

A method for simultaneously determining axial permeability and transverse permeability of tight reservoir cores by canister degassing test

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