Simultaneous pressure and electro-osmosis driven flow in charged porous media: Pore-scale effects on mixing and dispersion

Godinez-Brizuela, Omar E.; Niasar, Vahid

doi:10.1016/j.jcis.2019.11.084

Cited by 21 publications

(11 citation statements)

References 56 publications

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“…The negative charge gathered on the tight sandstone wall adsorbs positive ions in water to form a double electric layer (EDL), and the directional migration of ions in the double electric layer under the action of electric field is called electroosmosis. ,, When the pores are saturated with pure water, the pressure causes all water molecules to move forward evenly, forming a flat velocity profile, (Figure a). Also, when the pores are saturated with brine, the ions in EDL will hinder the migration of water molecules due to the wall attraction, resulting in faster migration of water molecules away from the wall (Figure b). ,, …”

Section: Eeor Mechanismmentioning

confidence: 99%

“…Therefore, in the two flow forms dominated by pressure and voltage, the ion transport in EDL appears as the resistance and the power of the water molecule movement, respectively. When pressure and DC electric field work together, the ions in the EDL move the boundary water molecules that cannot be moved by pressure alone, flattening the velocity profile (Figure d). , It can be seen that with the increase of electric field intensity and ion concentration, the electroosmosis gradually occupies the dominant position of flow, the velocity profile will be closer to the piston displacement, and the oil displacement efficiency will continue to increase. At the same time, the enhancement of electroosmosis makes the flow focus in the direction of easy formation of a path, and the sweep efficiency decreases, which is consistent with the experimental results.…”

Section: Eeor Mechanismmentioning

confidence: 99%

“…In addition, ions in the polar fluid of a reservoir are attracted by the electrostatic force and adsorbed near the pore wall to form an electric double layer (EDL), and the streaming potential is then generated to slow the flow due to the external driving pressure. The applied DC electric field in the same direction as the flow can offset the decrease of flow velocity caused by the streaming potential and even increase the electroosmotic flow rate . Meanwhile, the huge surface area of micro/nanopores provides excellent conditions for electrochemical reactions, and the contributions of possible mineral dissolution and deposition cannot be ignored.…”

Section: Introductionmentioning

confidence: 99%

“…The applied DC electric field in the same direction as the flow can offset the decrease of flow velocity caused by the streaming potential and even increase the electroosmotic flow rate. 22 Meanwhile, the huge surface area of micro/nanopores provides excellent conditions for electrochemical reactions, and the contributions of possible mineral dissolution and deposition cannot be ignored. So far, no attempts have been made to evaluate the potential contribution of DC electric fields to EOR in a hydrocarbon reservoir under various conditions.…”

Section: Introductionmentioning

confidence: 99%

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Laboratory Evaluation of Electrically Enhanced Oil Recovery in Tight Reservoirs

Jia,

Ning,

Lyu

et al. 2023

Energy Fuels

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By coupling the electrokinetic phenomenon, the direct current (DC) electric field has recently been considered as a novel process to enhance oil recovery over waterflooding. We conducted a series of coreflood experiments to evaluate the performance of electrically enhanced oil recovery in tight reservoirs and identify the key underlying mechanisms. Results show that the oil recovery induced by the DC electric field is higher than that of waterflooding. The oil recovery increases first and then decreases with the enhancement of the DC electric field. Using 0.05 mol/L NaCl solution with 10 V voltage, the highest oil recovery of 55.6% was increased by 28.4% compared with the average oil recovery (43.3%) of waterflooding. Not only does electroosmosis reduce the required pressure from 19.20 to 15.89 MPa with its variation proportional to the DC voltage and ion concentration but also such an electrochemical reaction changes the core mineral compositions (i.e., increasing the clay content but decreasing the orthoclase and calcite content), evidenced by a decrease in both contact angle up to 27.34% and absolute zeta potential up to 22.21%. By reduction of the flow resistance of water and increase of the oil−water ratio, electroosmosis shortens the time for the water at the displacement front to reach the outlet and reduces the volumetric sweep efficiency. Meanwhile, electroosmosis causes a smooth velocity profile similar to the piston-like displacement and increases displacement efficiency. Once a reduction in volumetric sweep efficiency could not be offset by an increase in displacement efficiency, oil recovery would be first improved with an increase in both voltage and ion concentration and then decreased, among which the effect of ion concentration is not as significant as that of the voltage.

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Section: Eeor Mechanismmentioning

confidence: 99%

Section: Eeor Mechanismmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Laboratory Evaluation of Electrically Enhanced Oil Recovery in Tight Reservoirs

Jia,

Ning,

Lyu

et al. 2023

Energy Fuels

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“…To describe flow at pore scale, i.e smaller physical scales where pore and solid space are resolved separately, flow and transport are simulated using more detailed description such as Hagen-Poiseulle or Stokes flow [18]. The most basic approach to computing the spatiotemporal evolution of the concentration of tracers is provided by the advection-diffusion equation.…”

Section: Pore-scale Radial Diffusion Models With Driftmentioning

confidence: 99%

Investigation of Drift Phenomena at the Pore Scale during Flow and Transport in Porous Media

et al. 2021

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This paper reports an analytical study conducted to investigate the behaviour of tracers undergoing creeping flow between two parallel plates in porous media. A new coupled model for the characterisation of fluid flow and transport of tracers at pore scale is formulated. Precisely, a weak-form solution of radial transport of tracers under convection–diffusion-dominated flow is established using hypergeometric functions. The velocity field associated with the radial transport is informed by the solution of the Stokes equations. Channel thickness as a function of velocities, maximum Reynolds number of each thickness as a function of maximum velocities and concentration profile for different drift and dispersion coefficients are computed and analysed. Analysis of the simulation results reveals that the dispersion coefficient appears to be a significant factor controlling the concentration distribution of the tracer at pore scale. Further analysis shows that the drift coefficient appears to influence tracer concentration distribution but only after a prolonged period. This indicates that even at pore scale, tracer drift characteristics can provide useful information about the flow and transport properties of individual pores in porous media.

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