GEOPHYSICAL RESEARCH, 2020, vol. 21, no. 3, pp. 19-33. https://doi.org/10.21455/gr2020.3-2

UDC 550.34.016

Abstract  References   Full text (in Russian)

THE INFLUENCE OF DIRECT CURRENT ON FILTRATION OF SUSPENSIONS IN ROCK: EXPERIMENTAL STUDY

G.А. Sobolev, А.V. Ponomarev, S.М. Kireenkova, Z-Yu.Ya. Maybuk

Schmidt Institute of Physics of the Earth, Russian Academy of Sciences, Moscow, Russia

Abstract. The influence of direct current in sandstone samples on the filtration of aqueous suspensions of NaCl, KCl, citric acid, and colloidal solution with aluminum oxide nanoparticles (nanofluids) was experimentally studied in this paper.

The studies were performed using cores of quartz-feldspar sandstone (diameter 30, length 60 mm), porosity 13–15 %, grain size 0.5–1.5 mm. High porosity allowed the solution filtration at atmospheric pressure. Sandstone samples in a heat shrink tube were fixed vertically on the bracket. Platinum mesh electrodes were installed at the ends of the cores, through which a solution was passed through the sample. Most of the experiments were carried out with sequential stepwise increase in voltages in the range of 12–100 V. Each sample was preliminarily saturated with a solution of a given composition, and the saturation was constant throughout the whole experiment. Further, time during which a fixed solution volume – one, five and ten drops – filtered through the sample at a given voltage was measured. Then the voltage was reduced to zero, and the cycle was repeated at a higher voltage. We used various fluid compositions (suspensions) with different concentration of components from 0.0025 to 0.02 %. The main solvents were distilled and natural water, to which citric acid, nanosized Al2O3 particles ranging from 20 to 80 nm, KCl and NaCl were added.

It was established that a general effect of direct current influence on samples with different compositions of suspensions is a proportional increase of the filtration rate with an increase in the ratio of present direct current to initial one. This regularity does not depend on the value of the initial current. The energy expenditure for the same increase in the filtration rate for water, suspensions of citric acid and nanofluids was several times lower than for suspensions with KCl and NaCl.

Keywords: laboratory modeling, fluid filtration, direct current, electroosmosis, nanofluids. 

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