Spontaneous emulsification induced by a novel surfactant-polymer compound system and its application to enhance oil recovery

Jiang, Jiatong; Kang, Xin; Wu, Hairong; Lu, Yao; Li, Zhe; Xu, Derong; Ma, Tao; Yang, Hongbin; Kang, Wanli

doi:10.1016/j.molliq.2021.116399

Cited by 16 publications

(3 citation statements)

References 55 publications

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“…The results showed that at higher SORs, the droplet obtained with the non-ionic surfactant Tween 80 was minimal, and the droplet formed when the surfactant was initially dispersed in the oil phase rather than the aqueous phase. Jiang [29] investigated SE induced by a surfactant polymer mixture system composed of hydrophobically modified polyvinyl alcohol (HPVA) and cetyltrimethylammonium bromide (CTAB). The effect of SE was found to be optimal at a concentration of 3000 mg/L and a mass ratio of 7:3 (HPVA: CTAB).…”

Section: Introductionmentioning

confidence: 99%

Factors, Mechanisms, and Kinetics of Spontaneous Emulsification for Heavy Oil-in-Water Emulsions

Liu,

Li,

Lun

et al. 2024

Molecules

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In challenging reservoirs where thermal recovery falls short, cold or chemical oil recovery methods are crucial. Spontaneous emulsification (SE), triggered by gentle disturbance, significantly enhances oil recovery. In elucidating SE mechanisms and kinetics, SE processes via direct contact between oil and aqueous phases without stirring were conducted. The effects of temperature, emulsifier concentration, pH, NaCl concentration, and the oil-to-water ratio on SE were investigated through droplet size analysis and turbidity measurements. Furthermore, the emulsification mechanism and derived emulsification kinetics based on turbidity data were obtained. The results underscore the feasibility of SE for oil–water systems, reducing viscous and capillary resistances without agitation. The emulsified oil mass increased with the temperature, pH, and aqueous-to-oil phase volume ratio while decreasing with the NaCl concentration. In this study, for GD-2 crude oil, the optimal emulsified oil amount occurred at a betaine surfactant (BetS-2) emulsifier concentration of 0.45%. Microscopic photo analysis indicated narrow particle size distributions and small droplets, which remained stable over time under various experimental conditions. A combined SE mechanism involving ultralow interfacial tension, interfacial turbulence due to Marangoni effects, and “diffusion and stranding” due to in situ emulsifier hydrophilicity, was speculated. Additionally, an analogous second-order kinetic equation for SE was proposed, indicating exceptional correlation with calculated and experimentally measured values. This study offers theoretical insight for enhancing oil recovery in chemical and cold production of heavy oil in oilfields.

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Section: Introductionmentioning

confidence: 99%

Factors, Mechanisms, and Kinetics of Spontaneous Emulsification for Heavy Oil-in-Water Emulsions

Liu,

Li,

Lun

et al. 2024

Molecules

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“…When m (HPVA) /m (CTAB) is 7:3, and the total concentration of the system is 3000 mg/L, the spontaneous emulsification system based on HPVA/CTAB mixed surfactant has the best effect, and the emulsion is more stable. The synergistic action of HPVA and CTAB enhances the intermolecular attraction, resulting in greater interfacial membrane strength and delayed demulsification time [31]. The emulsification of polymer surfactants mainly depends on two factors.…”

Section: Introductionmentioning

confidence: 99%

Preparation and Characterization of Biobased Dehydroabietyl Polyethylene Glycol Glycidyl Ether-Grafted Hydroxyethyl Cellulose with High Emulsifying Property

Ding¹,

Yang²,

Yan³

et al. 2024

JRM

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Dehydroabietyl polyethylene glycol glycidyl ether-grafted hydroxyethyl cellulose (HEC) polymer surfactant (DA (EO) 5 GE-g-HEC) was prepared using ring-opening polymerization with biobased rosin and hydroxyethyl cellulose as feedstocks. Dehydroabietyl polyethylene glycol glycidyl ether (DA(EO) 5 GE) was formed by condensation of dehydroabietyl alcohol polyoxyethylene ether (Rosin derivative: DA(EO) 5 H) and epichlorohydrin. The grafting degree of DA(EO) 5 GE-g-HEC was manipulated by adjusting the mass ratio of HEC and DA(EO) 5 GE and confirmed by EA. According to the formula, when m (HEC) /m (DA(EO)2GE) was 1:1~1:5, the grafting rate of DA(EO) 5 GE in DA(EO) 5 GE-g-HEC varied from 34.43% to 38.33%. The surface activity and foam properties of DA(EO) 5 GE-g-HEC aqueous solution were studied. The results showed that with the increase in grafting rate, the critical micellar concentration (CMC) in aqueous solution changed from 1.28 to 0.96 g/L. The results of the thermogravimetric analysis showed that the temperature range of the main stage of mass loss of DA(EO) 5 GE-g-HEC was 310°C~410°C, and the thermal decomposition processes of the samples with five mass ratios were similar. An oil in water emulsion was prepared by choosing cyclohexane as the oil phase and DA(EO) 5 GE-g-HEC as the emulsifier. The effect of DA(EO) 5 GE-g-HEC mass fraction on emulsion particle size and stability was analyzed. The results suggested that when the oil-water ratio was 8:2 with 0.4% emulsifier, the emulsion droplets were the smallest in terms of particle size and were the most stable. The rheological test results showed that the apparent viscosity decreased with the increase in shear rate and showed a typical elastic gel phenomenon.

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“…An increasing number of studies are employing interfacial rheometers to measure the properties of interfacial films during the oil-water emulsification processes. Based on these findings, researchers have analyzed the stability of the oil-water interface and investigated the emulsification mechanisms of polymers and surfactants in combination [25][26][27]. In addition, researchers have investigated changes in parameters such as conductivity and interfacial tension in emulsion fluids during the oil-water emulsification process with the aim to explore the influence of various surfactants and polymers on emulsification [28,29].…”

Section: Introductionmentioning

confidence: 99%

Dissipative Particle Dynamics Simulation and Microscopic Experimental Study of Emulsification Performance of Surfactant/Polymer Flooding

et al. 2023

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Polymers can increase the viscosity of water, reduce the relative permeability of the water phase, and enhance the flowability of the oil phase; surfactants can form molecular films at the oil–water interface boundaries, thereby reducing interfacial tension. Surfactant/polymer (S/P) flooding technology for enhancing oil recovery has become a major way to increase crude oil production. This study used dissipative particle dynamics (DPD) technology to simulate the emulsification process of a four-component composite system consisting of oil, water, sodium dodecylbenzene sulfonate (SDBS), and partially hydrolyzed polyacrylamide (HPAM). By changing the concentration of the S/P system, the effect on emulsification behavior was analyzed. Combined with particle distribution diagrams and interfacial tension parameters, the effect of the emulsification behavior on the performance of the S/P binary system was analyzed. On this basis, the effect of different emulsion performances on the recovery factor was evaluated using micro-experiments. The study found that the S/P system that produced stable emulsification had a lower interfacial tension and relatively good effect on improving the recovery factor. Increasing the concentration of the polymer and surfactant may cause changes in the interfacial film of the emulsion, thereby affecting the ability of the S/P system to reduce interfacial tension and may not improve the oil recovery factor. The research results help to better analyze and screen the S/P system used for oil extraction and improve crude oil recovery.

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Spontaneous emulsification induced by a novel surfactant-polymer compound system and its application to enhance oil recovery

Cited by 16 publications

References 55 publications

Factors, Mechanisms, and Kinetics of Spontaneous Emulsification for Heavy Oil-in-Water Emulsions

Factors, Mechanisms, and Kinetics of Spontaneous Emulsification for Heavy Oil-in-Water Emulsions

Preparation and Characterization of Biobased Dehydroabietyl Polyethylene Glycol Glycidyl Ether-Grafted Hydroxyethyl Cellulose with High Emulsifying Property

Dissipative Particle Dynamics Simulation and Microscopic Experimental Study of Emulsification Performance of Surfactant/Polymer Flooding

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