Fines migration and clogging under pH alteration: Stochastic model and its upscaling

IF 4.5 2区工程技术 Q2 ENGINEERING, CHEMICAL

Powder Technology Pub Date : 2025-02-12 DOI:10.1016/j.powtec.2025.120778

G. Loi, Y. Yang, C. Nguyen, T. Russell, P. Bedrikovetsky

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引用次数: 0

Abstract

Profound understanding of fine particle detachment, mobilisation, migration and consequent porous media clogging is essential for optimal design and clean-up of filter beds in water purification and wastewater treatment processes. In particular, changes in the solution pH affect the electrostatic force between particles and rocks which regulates particle detachment induced by viscous forces; fines detachment and migration usually leads to serious well rate decrease. The change in the concentration of attached particles when changing pH is quantified using a maximum retention function (MRF). Currently, this function can only be determined empirically from experiments despite strong theoretical foundations for predicting particle detachment. In this work, the microscale description of particle detachment is linked with macroscale predictions of particle detachment by averaging the condition of mechanical equilibrium over the distributions of microscale parameters. Heterogeneities of attached particles and pore space are reflected in probability distributions of relevant parameters. A Monte Carlo algorithm is implemented to combine the parameter distributions and detachment condition to calculate the MRF. The methodology allows for predictive modelling of particle detachment, and inverse modelling of the microscale parameter distributions. Inverse modelling is performed on two coreflooding tests in which the injected pH was varied. Fitting shows good agreement with the detachment model and the lever arm and aspect ratios determined during fitting are within commonly reported intervals. The model is used to recalculate the MRF versus velocity, which is then used to predict formation damage for production and injection wells at different values of pH.

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来源期刊

Powder Technology 工程技术-工程：化工

CiteScore

9.90

自引率

15.40%

发文量

1047

审稿时长

46 days

期刊介绍： Powder Technology is an International Journal on the Science and Technology of Wet and Dry Particulate Systems. Powder Technology publishes papers on all aspects of the formation of particles and their characterisation and on the study of systems containing particulate solids. No limitation is imposed on the size of the particles, which may range from nanometre scale, as in pigments or aerosols, to that of mined or quarried materials. The following list of topics is not intended to be comprehensive, but rather to indicate typical subjects which fall within the scope of the journal's interests: Formation and synthesis of particles by precipitation and other methods. Modification of particles by agglomeration, coating, comminution and attrition. Characterisation of the size, shape, surface area, pore structure and strength of particles and agglomerates (including the origins and effects of inter particle forces). Packing, failure, flow and permeability of assemblies of particles. Particle-particle interactions and suspension rheology. Handling and processing operations such as slurry flow, fluidization, pneumatic conveying. Interactions between particles and their environment, including delivery of particulate products to the body. Applications of particle technology in production of pharmaceuticals, chemicals, foods, pigments, structural, and functional materials and in environmental and energy related matters. For materials-oriented contributions we are looking for articles revealing the effect of particle/powder characteristics (size, morphology and composition, in that order) on material performance or functionality and, ideally, comparison to any industrial standard.