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Article overview
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Geo-mechanical aspects for breakage detachment of rock fines by Darcys flow | Abolfazl Hashemi
; Sara Borazjani
; Cuong Nguyen
; Grace Loi
; Nastaran Khazali
; Alex Badalyan
; Yutong Yang
; Zhao Feng Tian
; Heng Zheng Ting
; Bryant Dang-Le
; Thomas Russell
; Pavel Bedrikovetsky
; | Date: |
4 Jan 2023 | Abstract: | Suspension-colloidal-nano transport in porous media encompasses the
detachment of detrital fines against electrostatic attraction and authigenic
fines by breakage, from the rock surface. While much is currently known about
the underlying mechanisms governing detachment of detrital particles, including
detachment criteria at the pore scale and its upscaling for the core scale, a
critical gap exists due to absence of this knowledge for authigenic fines.
Integrating 3D Timoshenkos beam theory of elastic cylinder deformation with
CFD-based model for viscous flow around the attached particle and with strength
failure criteria for particle-rock bond, we developed a novel theory for fines
detachment by breakage at the pore scale. The breakage criterium derived
includes analytical expressions for tensile and shear stress maxima along with
two geometric diagrams which allow determining the breaking stress. This leads
to an explicit formula for the breakage flow velocity. Its upscaling yields a
mathematical model for fines detachment by breakage, expressed in the form of
the maximum retained concentration of attached fines versus flow velocity --
maximum retention function (MRF) for breakage. We performed corefloods with
piecewise constant increasing flow rates, measuring breakthrough concentration
and pressure drop across the core. The behaviour of the measured data is
consistent with two-population colloidal transport, attributed to detrital and
authigenic fines migration. Indeed, the laboratory data show high match with
the analytical model for two-population colloidal transport, which validates
the proposed mathematical model for fines detachment by breakage. | Source: | arXiv, 2301.01422 | Services: | Forum | Review | PDF | Favorites |
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