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|Title:||Particle mobilization in porous media: temperature effects on competing electrostatic and drag forces|
|Citation:||Geophysical Research Letters, 2015; 42(8):2852-2860|
|Publisher:||American Geophysical Union|
|Zhenjiang You, Pavel Bedrikovetsky, Alexander Badalyan, and Martin Hand|
|Abstract:||The ﬂuid ﬂow in natural reservoirs mobilizes ﬁne particles. Subsequent migration and straining of the mobilized particles in rocks greatly reduce reservoir permeability and well productivity. This chain of events typically occurs over the temperature ranges of 20–40°C for aquifers and 120–300°C for geothermal reservoirs. However, the present study might be the ﬁrst to present a quantitative analysis of temperature effects on the forces exerted on particles and of the resultant ﬁnes migration. Based on torque balance between electrostatic and drag forces acting on attached ﬁne particles, we derived a model for the maximum retention concentration and used it to characterize the detachment of multisized particles from rock surfaces. Results showed that electrostatic force is far more affected than water viscosity by temperature variation. An analytical model for ﬂow toward wellbore that is subject to ﬁnes migration was derived. The experiment-based predictive modeling of the well impedance for a ﬁeld case showed high agreement with ﬁeld historical data (coefﬁcient of determination R² = 0.99). It was found that the geothermal reservoirs are more susceptible to ﬁne particle migration than are conventional oilﬁelds and aquifers|
|Rights:||© 2015. American Geophysical Union. All Rights Reser ved.|
|Appears in Collections:||Australian School of Petroleum publications|
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