Stability mechanism of W/O crude oil emulsion stabilized by polymer and surfactant

Kang, Wanli; Xu, Bin; Wang, Yongjian; Li, Yuan; Shan, Xiuhua; An, Faquan; Liu, Jiaheng

doi:10.1016/j.colsurfa.2011.05.017

Cited by 177 publications

(83 citation statements)

References 19 publications

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“…Again, when the reverse (W/O) emulsions are formed, due to their high viscosity, they block the water channels and pore throats in the process of migration (Kang et al 2011). This phenomenon is particularly relevant for heavy oil recovery as observed in the works of Pei et al (2011), and later, by Dong et al (2012).…”

Section: Alkali-surfactant Floodingmentioning

confidence: 99%

Review of surfactant-assisted chemical enhanced oil recovery for carbonate reservoirs: challenges and future perspectives

et al. 2017

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Section: Alkali-surfactant Floodingmentioning

confidence: 99%

Review of surfactant-assisted chemical enhanced oil recovery for carbonate reservoirs: challenges and future perspectives

et al. 2017

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“…But low interfacial tension is not the key factor to stabilize emulsions as Aderangiet [39] pointed. Polymer contributes more to the stability of W/O crude oil emulsions stabilized by rigid cross-link network at oil/water interface which is formed by polymer and surfactant [40] . When added with xanthan, the emulsions become more stable and the emulsion particle size increases and the water separating process are seriously deferred.…”

Section: Effect Of Crude Oilmentioning

confidence: 99%

“…On the basis of above-mentioned studies, as xanthan was added to the conventional foam system, the generated foam has more stable texture, i.e., denser bubbles and thicker films. Xanthan can enhance the intermolecular interactions and promote the adsorption both at the gas/water interface and the oil/water interface [37] . As similar to nanoparticles, a small amount of oil/water microemulsion is coated with surfactants and xanthan molecules to act as surface-active agents which can stabilize foam.…”

Section: Effect Of Crude Oilmentioning

confidence: 99%

Experimental Validation of the Temperature-Resistant and Salt-Tolerant Xanthan Enhanced Foam for Enhancing Oil Recovery

Sun

Wei

et al. 2015

Journal of Dispersion Science and Technology

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Xanthan enhanced foam (XGF) is a newly developed chemical agent for enhanced oil recovery in high-temperature and high-salinity reservoirs. In this paper, laboratory experiments were performed to characterize the morphology and foam properties of XGF, to study its performance under different temperature and different salinity conditions, respectively. Based on simulate reservoir formation conditions of Xidaliya field, a series of research on XGF were conducted. The experimental results showed that the SEM of XGF reflected a more viscoelastic and stable nature of the foam system. High temperature had a great adverse impact upon the stability of XGF, and the increase of salinity in the solution helped to improve the stability of foam. The foam stability increased remarkably when XG4 is added, and an increase in ambient pressure made enhancement of foam stability became more noticeable. In the presence of crude oil, xanthan could enhance the stability Downloaded by [Columbia University] at 00:21 05 February 2015 2 of emulsions and was more favorable to stabilize foam. XG4 enhanced foam had dramatic properties for mobility controlling and oil displacement in the porous media.

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“…Therefore, the produced complex from the reaction between MgCl 2 and TEA is more-stable, resulting in a higher water-separation rate. more than 42 mm, both values are determined in enclosed air in the bottom and on the top of a cylindrical glass tube, respectively (Kang et al 2011). In this study, the height range of the samples was set at 2 to 39 mm, the formulated surfactant mass concentration was 1.5%, and the alkali-combination mass concentration was 0.2%.…”

Section: Resins (Wt%)mentioning

confidence: 99%

Effects of Surfactants and Alkalis on the Stability of Heavy-Oil-in-Water Emulsions

et al. 2016

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In this work, the effects of combining a surfactant/alkali on the stability of heavy-oil-in-water emulsions are analyzed by use of bottle testing, spinning-drop interfacial-tension (IFT) meters, microscopes, conductivity meters, zeta-potential analyzer Turbiscan laboratory expert stabilizer, and Anton Paar rheometer. The experimental results showed that the formulated surfactant (BS-12 and OP-10) had an optimal mass ratio (1:2), and the water-separation rates initially decreased sharply as the concentrations of the surfactant increased, before decreasing moderately until reaching a minimum value. The formulated alkali solution exerted a positive synergistic effect in tandem with the surfactant at low alkali concentrations. In this way, an increasing number of petroleum soaps are produced by reactions between the alkali solutions and the active components in heavy crude oil. However, the effect was reversed at high alkali concentrations, where the compression of the alkali on the electric double layer was more significant. Images of the emulsions taken with a microscope showed that the sizes of the oil droplets were the smallest when the alkali concentration was 0.2% and mass ratio of NaOH and TEA (triethanolamine) was 1:1, which indicated that the amount of petroleum soap produced reached the maximum at this point. In addition, TEA, as a type of surface-active molecule, can form cross-multiple adsorption and hydrogen-bonding structure with surfactant and petroleum soap at the water/oil interface. When the oil/water ratio was 7:3, the water-separation rate reached its lowest point 5.33% for 3 hours. In addition, the emulsion stabilized by the surfactant and the compositional alkali possesses salt tolerance and temperature resistance. When the concentration of the bivalent salt (CaCl 2 and MgCl 2 ) increased to 0.01molÁL À1 , the water-separation rate was less than 20%, and when the temperature increased from 30 to 60 C, the growth of back-scattering (BS) value was less than 2%.

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Stability mechanism of W/O crude oil emulsion stabilized by polymer and surfactant

Cited by 177 publications

References 19 publications

Review of surfactant-assisted chemical enhanced oil recovery for carbonate reservoirs: challenges and future perspectives

Review of surfactant-assisted chemical enhanced oil recovery for carbonate reservoirs: challenges and future perspectives

Experimental Validation of the Temperature-Resistant and Salt-Tolerant Xanthan Enhanced Foam for Enhancing Oil Recovery

Effects of Surfactants and Alkalis on the Stability of Heavy-Oil-in-Water Emulsions

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