Nonlinear simulation of miscible displacements with concentration-dependent diffusion coefficient in homogeneous porous media

Yuan, Qingwang; Zhou, Xiang; Zeng, Fanhua; Knorr, Kelvin D.; Imran, Muhammad

doi:10.1016/j.ces.2017.07.009

Cited by 21 publications

(9 citation statements)

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“…It should be noted that the diffusion coefficient is concentration‐dependent and isotropic, which is more practical and realistic for the miscible binary system. A more detailed discussion about the role of CDC can be found in the previous studies through experiments, linear stability analysis, and nonlinear simulations . The VID, given by the second term on the right side of Eq.…”

Section: Problem Formulationmentioning

confidence: 99%

“…It should be noted that our present research is more focused on the physical problems and the insights which can be obtained for such cyclic time‐dependent displacement scenario. A detailed description of the similar implementations and modeling process can be found in previous studies …”

Section: Problem Formulationmentioning

confidence: 99%

“…More practically, the diffusion coefficient is concentration‐dependent (CDC) for a binary miscible system, proved by a series of experiments . The different diffusion–concentration relations have been previously examined . Different with the diffusion, the dispersion is however strongly velocity‐induced (VID) .…”

Section: Introductionmentioning

confidence: 99%

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Control of viscous fingering and mixing in miscible displacements with time‐dependent rates

et al. 2018

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In miscible displacements encountered in enhanced oil recovery processes, the unfavorable viscosity contrast between injected solvent and oil usually leads to viscous fingering (VF), a hydrodynamic instability which may result in a lower sweep efficiency and oil recovery. This phenomenon can be observed in a wide range of flows in subsurface porous media. This study examined a simple cyclic time‐dependent displacement rate and its effects on the onset and longer development of VF. It is found that such varying displacement rate can either stabilize or destabilize VF, depending on the cycle period, amplitude, and displacement scenarios. The most important mechanism is that such time‐dependent rate can effectively change the competition between convection (destabilizing effect) and dispersion (stabilizing effect). This is different from the widely used constant injection rate where the flow instability is actually determined by the Peclet number and mobility contrast for a given scenario. This study therefore provided a new aspect to control VF, either enhance or reduce, with low additional costs. It is therefore both scientifically and practically important for a wide range of flows in subsurface porous media. © 2017 American Institute of Chemical Engineers AIChE J, 65: 360–371, 2019

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Section: Problem Formulationmentioning

confidence: 99%

Section: Problem Formulationmentioning

confidence: 99%

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Control of viscous fingering and mixing in miscible displacements with time‐dependent rates

et al. 2018

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“…Concentration‐dependent diffusion coefficients are mostly discussed in the context of petrochemical processes for diffusion of gases through heavy oil or bitumen . Here, an exponential decay is applied to describe the dimensionless viscosity µ* :

true μ * = \frac{μ}{μ_{1}} = e^{S (1 - c *)}

…”

Section: Theorymentioning

confidence: 99%

Diffusion Studies of Glucose and Sucrose in Chitosan Membranes and Beads for Enzymatic Production Processes

et al. 2018

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The diffusion of glucose and sucrose was investigated in membrane and bead experiments. Concentration-dependent diffusion coefficients of pure glucose and sucrose were determined in precipitated chitosan membranes of varying thickness using diffusion cell experiments. Contrary to fructose, the resulting diffusion coefficients of glucose and sucrose did not reach their free diffusion coefficients at infinite dilution suggesting additional interactions between chitosan and these two sugars. Counter-diffusion in bead experiments showed a good agreement between predicted and measured data allowing the inclusion of the diffusion data in the simulation of the proposed production process for laminaribiose. In conclusion, the encapsulation in chitosan presented a good trade-off between increased mass transfer resistance as evaluated by the Thiele modulus and improved thermal stability and antibacterial activity.

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“…Consequently, a lower oil recovery factor is obtained when solution gas exists in the heavy oil, as shown in Figure 6. The negative effects of the existence of the initial solution gas were briefly reported in the previous literature [56][57][58][59][60][61][62][63][64][65][66][67][68][69]. In this study, more details are investigated.…”

Section: Effect Of the Initial Gas Oil Ratiomentioning

confidence: 99%

Numerical Simulation Study on Steam-Assisted Gravity Drainage Performance in a Heavy Oil Reservoir with a Bottom Water Zone

Zhou

Yuan

et al. 2017

Energies

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Abstract:In the Pikes Peak oil field near Lloydminster, Canada, a significant amount of heavy oil reserves is located in reservoirs with a bottom water zone. The properties of the bottom water zone and the operation parameters significantly affect oil production performance via the steam-assisted gravity drainage (SAGD) process. Thus, in order to develop this type of heavy oil resource, a full understanding of the effects of these properties is necessary. In this study, the numerical simulation approach was applied to study the effects of properties in the bottom water zone in the SAGD process, such as the initial gas oil ratio, the thickness of the reservoir, and oil saturation of the bottom water zone. In addition, some operation parameters were studied including the injection pressure, the SAGD well pair location, and five different well patterns: (1) two corner wells, (2) triple wells, (3) downhole water sink well, (4) vertical injectors with a horizontal producer, and (5) fishbone well. The numerical simulation results suggest that the properties of the bottom water zone affect production performance extremely. First, both positive and negative effects were observed when solution gas exists in the heavy oil. Second, a logarithmical relationship was investigated between the bottom water production ratio and the thickness of the bottom water zone. Third, a non-linear relation was obtained between the oil recovery factor and oil saturation in the bottom water zone, and a peak oil recovery was achieved at the oil saturation rate of 30% in the bottom water zone. Furthermore, the operation parameters affected the heavy oil production performance. Comparison of the well patterns showed that the two corner wells and the triple wells patterns obtained the highest oil recovery factors of 74.71% and 77.19%, respectively, which are almost twice the oil recovery factors gained in the conventional SAGD process (47.84%). This indicates that the optimized SAGD process with the two corner wells and the triple wells pattern is able to improve SAGD production performance in a heavy oil reservoir with a bottom water zone.

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Nonlinear simulation of miscible displacements with concentration-dependent diffusion coefficient in homogeneous porous media

Cited by 21 publications

References 50 publications

Control of viscous fingering and mixing in miscible displacements with time‐dependent rates

Control of viscous fingering and mixing in miscible displacements with time‐dependent rates

Diffusion Studies of Glucose and Sucrose in Chitosan Membranes and Beads for Enzymatic Production Processes

Numerical Simulation Study on Steam-Assisted Gravity Drainage Performance in a Heavy Oil Reservoir with a Bottom Water Zone

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