Simulation of surface deposition of colloidal spheres under flow

López, Pablo Vidal; Omari, Abdelaziz; Chauveteau, G.

doi:10.1016/j.colsurfa.2004.03.006

Cited by 13 publications

(14 citation statements)

References 5 publications

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“…This result has been confirmed using simulations (Lopez et al 2004). Finally, we mention the work by Veerapen et al (2001) and Lopez et al (2004) who evidenced a shear-thinning effect caused by hydrodynamic shadowing that reduces the available surface area for deposition downstream to an already-deposited particle. Veerapen et al (2001) defined a particle-based hydrodynamic-shadowing Péclet number as Pe hs = v // d p /D, with v // being the tangential convective velocity.…”

Section: Maximum Deposition Density and Permeability Reductionsupporting

confidence: 65%

Water Quality and Well Injectivity: Do Residual Oil-in-Water Emulsions Matter?

2010

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The present work is a part of a thorough and systematic laboratory study of oil-in-water emulsion flow in porous media that we have undertaken recently to investigate the mechanisms of oil-droplet retention and its consecutive effect on permeability. One of our main objectives was to see how the in-depth propagation of producedwater (PW) residual dilute emulsion could impair the permeability during PW reinjection (PWRI). During this casework, we used granular packs of sharp-edged silicon carbide grains and stable and dilute dodecane-in-water emulsions. The flow experiments were performed under well-controlled conditions, and we studied the effect of most of the relevant parameters, including flow rate, salinity, droplet size, and permeability of the porous medium.A careful monitoring of the salinity and the jamming ratio (JR) allowed us to consider and work separately on the two main mechanisms of droplet capture (i.e., surface capture and straining capture). In a previous paper (Buret et al. 2008), we reported on the effect of salinity and flow rate on emulsion flow through porous media where the pore-size/droplet-size ratio (JR) was very high, ensuring that only droplet capture on pore surface is operative. This paper reports on the effect of salinity and JR on both mechanisms, with the main focus being on the induced permeability impairment.We demonstrated that surface capture could induce significant in-depth permeability losses even at a high JR. The maximum reached permeability loss is very sensitive to salinity and flow rate (shear-thinning effect). This maximum is always lower than a limiting value dictated by the surface-coverage jamming limit of random sequential adsorption (RSA) theory. This limiting value increases while decreasing the JR, according to a simple formula extracted from Poiseuille's law with a mean hydrodynamic thickness of the deposited layer close to the droplet diameter (monolayer deposition). Regarding the straining capture, we determined a critical JR of 7 for this mechanism to occur. Preliminary results using only two JR values and one flow rate are presented. Compared to surface capture, the results show that straining capture induces more severe plugging with a lower rate of propagation. The lower the JR is, the more severe the plugging is and the lower the propagation rate is. However, more investigations are still required, notably using various JRs and flow rates to characterize this important mechanism better.

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Section: Maximum Deposition Density and Permeability Reductionsupporting

confidence: 65%

Water Quality and Well Injectivity: Do Residual Oil-in-Water Emulsions Matter?

2010

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“…Such an observation is consistent with the hypothesis of a random sequential adsorption of unpenetrable microgels onto accessible surface [36,37]. Such an observation is consistent with the hypothesis of a random sequential adsorption of unpenetrable microgels onto accessible surface [36,37].…”

Section: Thickness Of Adsorbed Layersupporting

confidence: 89%

Rheology and Transport in Porous Media of New Water Shutoff / Conformance Control Microgels

Rousseau

Chauveteau

Renard

et al. 2005

Proceedings of SPE International Symposium on Oilfield Chemistry

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TX 75083-3836, U.S.A., fax 01-972-952-9435. AbstractThe performances of new microgels specifically designed for water shutoff and conformance control were extensively investigated at laboratory scale. These microgels are preformed, stable, fully water soluble, size controlled with a narrow size distribution, and non-toxic. They reduce water permeability by forming adsorbed layers soft enough to be very easily collapsed by oil-water capillary pressure, so that oil permeability is not significantly affected. Since the manufacturing process of these new microgels make possible to vary chemical composition, size and crosslink density, they can be designed as desired to meet the requirements of a given field application. The laboratory results reported in this paper concerns mainly three microgel samples having significantly different crosslink densities. We describe the relevant laboratory methods used to determine main microgel characteristics. The microgels have remarkable mechanical, chemical and thermal stability. Their behavior in porous media have been investigated extensively, showing that: 1) their propagation distance is only limited by the volume injected, 2) their injectivity is facilitated by a shear-thinning behavior and 3) water permeability reduction can be achieved as desired by controlling the thickness of adsorbed layer. Thus, this new microgels, now available at industrial scale, look as very promising tools, not only for water shutoff but also for conformance control in heterogeneous reservoirs.

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“…Such an exclusion zone is also expected to exist during adsorption process of new flowing colloidal particles in the vicinity of already adsorbed particles and is referred to as the hydrodynamic shadowing effect. This effect is obviously more pronounced as flow strength increases [44]. Concerning the pressure field, an overpressure is localized in the upstream of the hard sphere and a depressive wake in its downstream similar to the classic case where a hard sphere is imbedded in an imposed uniform flow.…”

Section: Flow Structurementioning

confidence: 77%

Numerical simulation of retention and release of colloids in porous media at the pore scale

Sefrioui

Ahmadi

Omari

et al. 2013

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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Transport of a solid colloidal particle was simulated at the pore scale in presence of surface roughness and particle/pore physicochemical interaction by adopting a “one fluid” approach. A code developed in our laboratory was used to solve equations of motion, while implementing additional modules in order to take into account lubrication and physicochemical forces. Particles were recognized through a phase indicator function and the particle/fluid interface position at each instant was obtained by solving a transport equation. Roughnesses of different shapes were considered and the magnitude of the particle/pore physicochemical interaction was monitored through the change of the ionic strength of the suspending fluid. We first show that if pore surface is smooth no retention of the transported particle occurs whether the particle/pore surface is attractive or repulsive. However for shape roughnesses of “peak” or “valley”, particles may be retained inside pores or not depending on the considered ionic strength. In absence of particle retention, the residence time (the time needed for a particle to travel a characteristic pore distance) is finite and was found to be an increasing function of ionic strength for every considered roughness at fixed hydrodynamic conditions.International audienceTransport of a solid colloidal particle was simulated at the pore scale in presence of surface roughness and particle/pore physicochemical interaction by adopting a “one fluid” approach. A code developed in our laboratory was used to solve equations of motion, while implementing additional modules in order to take into account lubrication and physicochemical forces. Particles were recognized through a phase indicator function and the particle/fluid interface position at each instant was obtained by solving a transport equation. Roughnesses of different shapes were considered and the magnitude of the particle/pore physicochemical interaction was monitored through the change of the ionic strength of the suspending fluid. We first show that if pore surface is smooth no retention of the transported particle occurs whether the particle/pore surface is attractive or repulsive. However for shape roughnesses of “peak” or “valley”, particles may be retained inside pores or not depending on the considered ionic strength. In absence of particle retention, the residence time (the time needed for a particle to travel a characteristic pore distance) is finite and was found to be an increasing function of ionic strength for every considered roughness at fixed hydrodynamic conditions

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Simulation of surface deposition of colloidal spheres under flow

Cited by 13 publications

References 5 publications

Water Quality and Well Injectivity: Do Residual Oil-in-Water Emulsions Matter?

Water Quality and Well Injectivity: Do Residual Oil-in-Water Emulsions Matter?

Rheology and Transport in Porous Media of New Water Shutoff / Conformance Control Microgels

Numerical simulation of retention and release of colloids in porous media at the pore scale

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