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Mechanisms of tripartite permeability evolution for supercritical CO2 in propped shale fractures

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Hou, Lei and Elsworth, Derek (2021) Mechanisms of tripartite permeability evolution for supercritical CO2 in propped shale fractures. Fuel, 292 . 120188. doi:10.1016/j.fuel.2021.120188 ISSN 0016-2361.

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Official URL: http://dx.doi.org/10.1016/j.fuel.2021.120188

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Abstract

Characterization of CO2 flow in propped fractures is important in defining the response to CO2 injection for reservoir stimulation and CO2 sequestration. We measure the evolution of permeability in propped fractures of shale to both adsorbing CO2 and non-adsorbing He under sub- and super-critical conditions. A tripartite permeability-pressure evolution curve is obtained when supercritical, consisting of a dual-U-shaped evolution first below and then exceeding critical pressure with a V-shaped fluctuation spanning the phase transition. The increasing adsorbed-phase-density and resultant swelling stress may control the permeability variation around the critical point. The inorganic adsorbent (mainly clay) may contribute to the secondary U-shaped evolution according to its sorption isotherm. The secondary adsorption may be generated by increasing sorption sites (competitive adsorption between CO2 and H2O) or through multi-layered sorption and stronger diffusion of supercritical CO2. Further constraint is applied through observations of permeability recovery between initial and repeat saturations to non-adsorptive He. An abnormal increment of permeability recovery ratio is obtained for secondary adsorption, which may be caused by the dehydration and shrinkage of the matrix and the dissolution of minerals. Mechanisms of permeability evolution for CO2 in shale are classified between organic and inorganic fractions. The contributions of adsorption to the permeability evolution are quantified by comparisons for permeation by CH4 and He. A flat X-shaped trend is apparent, in which the inorganic contribution to permeability increases with increasing pressure while the organic contribution to permeability decreases with increasing pressure. The ratio of inorganic contribution reaches 60–70% under supercritical conditions.

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, Shale -- Permeability, Hydraulic fracturing, Carbon dioxide, Clay, Supercritical fluids
Journal or Publication Title: Fuel
Publisher: Elsevier Ltd
ISSN: 0016-2361
Official Date: 15 May 2021
Dates:
DateEvent
15 May 2021Published
11 February 2021Available
9 January 2021Accepted
Volume: 292
Article Number: 120188
DOI: 10.1016/j.fuel.2021.120188
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: 11 February 2022
RIOXX Funder/Project Grant:
Project/Grant IDRIOXX Funder NameFunder ID
846775[ERC] Horizon 2020 Framework Programmehttp://dx.doi.org/10.13039/100010661
Is Part Of: 1

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