Abstract
Injectivity damage by fines migration during low-salinity water injection can highly affect field-scale waterflooding projects. In this paper, we develop novel analytical models for one-dimensional linear and radial suspension-colloidal flows accounting for detachment, mobilisation, migration, and straining of natural reservoir fines. We also perform laboratory corefloods by water with piecewise constant decreasing salinity, and with monitoring the breakthrough particle concentration and pressure drop across the core. The analytical model for linear flows matches the laboratory data with high accuracy, and tuned model coefficients belong to the common-value intervals for those coefficients. The analytical model for radial flows predicts well behaviour; the experimental-data-tuned coefficients are used for reliable laboratory-based prediction of injectivity index decline. The calculations show a significant decline of injection-well index due to fines migration during low-salinity water injection.
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