首页|Incorporation of geochemical, geometrical and intermolecular interactions into modelling of scale removal in a capillary microchannel
Incorporation of geochemical, geometrical and intermolecular interactions into modelling of scale removal in a capillary microchannel
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Along with scale deposition on rock surfaces during brine-rock interactions, it is likely that the formed deposit may be dislodged due to shear stress exerted by flowing brine. This study presents a simplified model for removal of gypsum scale from rock surfaces of anhydrite, calcite, dolomite, and sandstone during the interaction with brines of 3000 mg/L and 6000 mg/L of [Ca~(2+)] within a capillary microchannel. To do so, the intermolecular interaction energies primarily Lewis acid-base adhesion energy for gypsum scale on various rocks were firstly characterized in order to develop the surface energy-based correlation of deposit strength for the formed scale layer. The kinetic and hydrodynamic patterns of scale removal were then attained based on the assumption of asymptotic behaviour for the net mass of scale at the end of the scaling process. The results showed that the removal rate initially increases profoundly followed by a low-sloped increment. Higher flow velocity increases the removal flux of gypsum scale from different rock surfaces as much as 2.4-and 2.2-fold for the brine salinity of 3000 mg/L and 6000 mg/L of [Ca~(2+)], respectively. Furthermore, higher brine salinity in terms of [Ca~(2+)] would lead to more removal of gypsum scale from the rock surfaces of anhydrite followed by carbonate and sandstone reservoir rock surfaces approximately 1.9-fold at the lower flow velocity and 1.8-fold for the higher brine flow velocity, respectively.
Brine-rock interactionDepositionScale removalSurface energyXDLVO theory
Amir Hossein Nikoo、M. Reza Malayeri
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Department of Chemical Engineering, School of Chemical and Petroleum Engineering, Shiraz University, Shiraz, Iran
NSTL
