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Swelling and embedment induced by sub- and super-critical-CO2 on the permeability of propped fractures in shale
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Hou, Lei, Elsworth, Derek and Geng, Xueyu (2020) Swelling and embedment induced by sub- and super-critical-CO2 on the permeability of propped fractures in shale. International Journal of Coal Geology, 225 . 103496. doi:10.1016/j.coal.2020.103496 ISSN 01665162.
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WRAP-selling-embedment-induced-sub-super-critical-CO2-permeability-propped-fractures-shale-Hou-2020.pdf - Accepted Version - Requires a PDF viewer. Available under License Creative Commons Attribution Non-commercial No Derivatives 4.0. Download (1084Kb) | Preview |
Official URL: http://dx.doi.org/10.1016/j.coal.2020.103496
Abstract
Swelling and embedment exert significant influence on the evolution of permeability in propped fractures, potentially consuming significant proportions of the original gain in permeability. We measure the evolution of permeability in propped fractures of shale to both adsorbing CO2 and non-adsorbing He – accommodating the impacts of aperture change due to proppant pack compaction and both reversible and irreversible modes of embedment. A linear relation between pressure and log-permeability is obtained for He, representing the impact of effective stresses in proppant pack compaction, alone. Permeability change with pressure is always concave upwards and U-shaped for gaseous subcritical CO2 and W-shaped for supercritical CO2. One exception is for liquid CO2 at high injection pressure where effective stress effects and swelling contribute equally to the change in permeability and result in a linear curve with the lowest permeability. Approximately ~50–70% of the permeability recovers from the recovery of swelling after the desorption of CO2. The magnitude of swelling is recovered from measurements of permeability change and ranges from 0.005 to 0.06 mm, which contributes ~9–56% of the total swelling and induced embedment as evaluated from the adsorbed mass. Swelling also increases embedment by a factor of ~1.84–1.93 before and after the injection of CO2. A new calibration equation representing swelling and induced embedment is generated accommodating Langmuir isothermal sorption and verified against experiments on rocks both admitting and excluding swelling and embedment and for various sorbing and non-sorbing gases. Stability and accuracy of the predictions demonstrate the universality of the approach that may be applied to both enhanced gas recovery and CO2 sequestration.
| Item Type: | Journal Article | ||||||
|---|---|---|---|---|---|---|---|
| Subjects: | Q Science > QE Geology | ||||||
| Divisions: | Faculty of Science, Engineering and Medicine > Engineering > Engineering | ||||||
| Library of Congress Subject Headings (LCSH): | Shale, Carbon dioxide -- Absorption and adsorption, Hydraulic fracturing, Swelling soils, Engineering geology | ||||||
| Journal or Publication Title: | International Journal of Coal Geology | ||||||
| Publisher: | Elsevier | ||||||
| ISSN: | 01665162 | ||||||
| Official Date: | 1 May 2020 | ||||||
| Dates: |
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| Volume: | 225 | ||||||
| Article Number: | 103496 | ||||||
| DOI: | 10.1016/j.coal.2020.103496 | ||||||
| Status: | Peer Reviewed | ||||||
| Publication Status: | Published | ||||||
| Access rights to Published version: | Restricted or Subscription Access | ||||||
| Date of first compliant deposit: | 15 November 2021 | ||||||
| Date of first compliant Open Access: | 15 November 2021 | ||||||
| RIOXX Funder/Project Grant: |
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