Untitled

Apaydin, O.G.; Kovscek, A. R.

doi:10.1023/a:1010740811277

Cited by 105 publications

(36 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The increase of apparent viscosity with increasing surfactant concentration would suggest that sweep efficiency is also improved. Apaydin and Kovscek [9] showed in their experiments that the overall recovery and the time to gas breakthrough increase as the surfactant concentration increases. At the maximum concentration, fmdry (~0.26) is almost equal to the connate water saturation (~0.25) which means that foam is very stable.…”

Section: Modellingmentioning

confidence: 99%

See 1 more Smart Citation

Effect of surfactant concentration on foam: From coreflood experiments to implicit-texture foam-model parameters

Jones

Laskaris

Vincent-Bonnieu

et al. 2016

Journal of Industrial and Engineering Chemistry

View full text Add to dashboard Cite

We present a comparative study of foam coreflood experiments with various surfactant concentrations. Plots of apparent viscosity vs. injected gas fraction were obtained for surfactant concentrations at the critical micelle concentration and above. Bulk foam stability was measured for all concentrations and compared with coreflood results. There were different responses to surfactant concentration in bulk and in corefloods. The coreflood results were matched with an Implicit Texture foam model and the dependency of the model parameters on the surfactant concentration is discussed. Fitting the data requires relating the surfactant concentration to the dry-out function or the limiting capillary-pressure.

show abstract

Section: Modellingmentioning

confidence: 99%

“…gave large pressure gradients along the core. Apaydin and Kovscek [9] considered transient flow behavior and gas mobility at a fixed foam quality and found that displacement efficiency decreased and gas mobility increased (i.e. the foam became weaker) with decreasing surfactant concentration.…”

Section: Introductionmentioning

confidence: 99%

Effect of surfactant concentration on foam: From coreflood experiments to implicit-texture foam-model parameters

Jones

Laskaris

Vincent-Bonnieu

et al. 2016

Journal of Industrial and Engineering Chemistry

View full text Add to dashboard Cite

show abstract

“…SAG core-floods can be difficult to interpret because of uncertainties they can introduce: slow foam dynamics in the laboratory due to slow foam generation can introduce significant bias in the results, since local-equilibrium conditions do not apply [14]. Moreover, averaging pressure gradients (or, equivalently, apparent viscosity) throughout the entire core length can introduce bias as separate segments of the core exist at different states; an entrance region can exist where foam never reaches its full strength, and also a capillary end effect can be present at the core outlet controlling liquid saturation which, in turn, influences foam behavior [15].…”

Section: Introductionmentioning

confidence: 99%

Effect of temperature on foam flow in porous media

Kapetas

Vincent-Bonnieu

Danelis

et al. 2016

Journal of Industrial and Engineering Chemistry

View full text Add to dashboard Cite

Foam can increase sweep efficiency within a porous medium, which is useful for oil-recovery processes [1]. The flow of foam in porous media is a complex process that depends on properties like permeability, porosity and surface chemistry, but also temperature. Although the surface activity of surfactants as a function of temperature is well described at the liquid/liquid or liquid/ gas interface, data on the effect of temperature on foam stability is limited, especially in porous media.In this work, we tested a surfactant (AOS) at different temperatures, from 20°C to 80°C, in a sandstone porous medium with co-injection of foam. The pressure gradient, or equivalently the apparent viscosity, was measured in steady-state experiments. The core-flood experiments showed that the apparent viscosity of the foam decreased by 50% when the temperature increased to 80°C. This effect correlates with the lower surface tension at higher temperatures. These results are compared to bulk foam experiments, which show that at elevated temperatures foam decays and coalesces faster. This effect, however, can be attributed to the faster drainage at high temperature, as a response to the reduction in liquid viscosity, and greater film permeability leading to faster coarsening. Our results using the STARS foam model show that one cannot fit foam-model parameters to data at one temperature and apply the model at other temperatures, even if one accounts for the change in fluid properties (surface tension and liquid viscosity) with temperature. Experiments show an increase in gas mobility in the low-quality foam regime with increasing temperature that is inversely proportional to the decrease in gas-water surface tension. In the high-quality regime, results suggest that the water saturation at which foam collapses fmdry increases and P c * decreases with increasing temperature.

show abstract

“…It is known that the oil phase, surfactant type, concentration, and total liquid injection velocity are crucial to the foam mobility reduction ability, which can be ascribed to the roles of each of these factors on the stability of the foam films . The presence of oil is of primary importance since its effect on lamellae stability depends on the extent to which the foam lamellae interact with the oil .…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation and modelling of CO₂‐foam flow in heavy oil systems

Zhao

Torabi

2019

Can J Chem Eng

View full text Add to dashboard Cite

In this work, the C14‐16 alpha olefin sulphonate (AOS) surfactant, octylphenol ethoxylate (TX‐100), and methyl bis[Ethyl(Tallowate)]‐2‐hydroxyethyl ammonium methyl sulphate (VT‐90) surfactant were selected as representatives of anionic, nonionic, and cationic surfactant to stabilize foam. The effects of surfactant concentration and gas/liquid injection rates on foam performance were examined by performing a series of oil‐free foam flow tests by injecting CO2 and a foaming surfactant simultaneously into sandpacks. Foam flooding was conducted as a tertiary enhanced oil recovery (EOR) method after conventional water flooding and surfactant flooding. Furthermore, a new method was proposed to determine the residual oil saturation. The foam stability in the presence and absence of heavy oil was studied by a comparative evaluation of the mobility reduction factor (FMR) in both cases. The foam fractional flow modelling by Dholkawala and Sarma[36] was modified based on experimental results obtained in this study. The range of the ratio of two important model parameters (Cg/Cc) at various foam qualities was determined and could be used for large‐scale predictions. The results showed that during the oil‐free foam displacement experiments higher foam apparent viscosities (italicμitalicapp) were attained at lower gas flow rates and the maximum was attained at a total gas and liquid injection rate of 0.25 cm3/min with a gas fractional flow ratio of 0.8 for the foam in the absence of oil. The presence of oil reduced the foam mobility reduction factors (FMR) to different degrees with FMR‐without oil / FMR‐with oil ranging from 4.25–13.69, indicating that the oil had a detrimental effect on the foam texture. The foam flooding successfully produced an additional 8.1–21.52 % of OOIP, which can be attributed to the combined effect of increasing the pressure gradient and oil transporting mechanisms.

show abstract

Untitled

Cited by 105 publications

References 0 publications

Effect of surfactant concentration on foam: From coreflood experiments to implicit-texture foam-model parameters

Effect of surfactant concentration on foam: From coreflood experiments to implicit-texture foam-model parameters

Effect of temperature on foam flow in porous media

Experimental investigation and modelling of CO₂‐foam flow in heavy oil systems

Contact Info

Product

Resources

About

Untitled

Cited by 105 publications

References 0 publications

Effect of surfactant concentration on foam: From coreflood experiments to implicit-texture foam-model parameters

Effect of surfactant concentration on foam: From coreflood experiments to implicit-texture foam-model parameters

Effect of temperature on foam flow in porous media

Experimental investigation and modelling of CO2‐foam flow in heavy oil systems

Contact Info

Product

Resources

About

Experimental investigation and modelling of CO₂‐foam flow in heavy oil systems