Performance of a good‐emulsification‐oriented surfactant‐polymer system in emulsifying and recovering heavy oil

Wang, Yefei; Li, Zongyang; Ding, Mingchen; Yu, Qingxu; Zhong, Dong; Cao, Xun

doi:10.1002/ese3.499

Cited by 12 publications

(5 citation statements)

References 36 publications

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“…The nonionic surfactant has good salt-resistance but poor temperature resistance. Although the anionic-nonamphoteric surfactant has good temperature and salt resistance, it is still presents a challenge for crude oil at high temperatures and high calcium and magnesium content. − …”

Section: Introductionmentioning

confidence: 99%

High-Efficiency High-Temperature-Resistant Nanosilica Viscosity Reducer for Extra-Heavy Oil Viscosity Reduction

Liu,

Wang,

Liang

et al. 2024

ACS Omega

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Due to the fact that more conventional heavy oil recovery methods (heating, emulsification, dilution, and other methods) have many shortcomings, they cannot meet the demand of heavy oil exploitation. Therefore, there is a need for new recovery methods. In this paper, the surface of nano SiO 2 was modified with a silane coupling agent, KH-560, to prepare a nanoviscosity reducer (NRV), which has high-temperature resistance (300 °C), calcium and magnesium resistance (Ca 2+ + Mg 2+ > 900 mg/L) and high viscosity reduction rate (>99%). FTIR and SEM measurements showed that KH560 has been successfully connected to the surface of SiO 2 . The particle size distribution of NRV is mainly distributed in 50−80 nm, which matches the results of SEM. The experimental results showed that the viscosity reduction rates of 1 wt % NRV on M-1 heavy oil before and after aging were 99.73% and 99.71%, respectively. The viscosity reduction effect of 1% NRV on M-1 heavy oil and the bleeding rate of emulsion formation were investigated when the oil−water ratio ranged from 9:1 to 1:9. The results showed that when the oil−water ratio was between 7:3 and 1:9, the viscosity reduction rate was greater than 99%. Besides, the bleeding rate of emulsion increases with the decrease of the oil−water ratio. What's more, static and dynamic adsorption experiments showed that the adsorption capacity of 1 wt % NRV was 1.746 mg/g and 1.668 mg/g sand, respectively. The interfacial tension experiment showed that the interfacial tension (IFT) between 1 wt % NRV and M-1 heavy oil was 0.052 mN/m, and low interfacial tension was beneficial to displace the oil in the formation pores. At the same time, the displacement effect of NRV on M-1 heavy oil at different concentrations (0.5, 1.0, and 1.5 wt %) and temperatures (200, 250, and 300 °C) was investigated by core flooding experiments. The results showed that the recovery rate increases with the increase of NRV concentration, and 1 wt % NRV at 300 °C will improve the recovery rate of M-1 heavy oil by 27.3% compared to steam flooding. NRV could reduce the viscosity of crude oil, which provides technical guidelines for the exploitation of heavy oil and extra heavy oil.

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Section: Introductionmentioning

confidence: 99%

High-Efficiency High-Temperature-Resistant Nanosilica Viscosity Reducer for Extra-Heavy Oil Viscosity Reduction

Liu,

Wang,

Liang

et al. 2024

ACS Omega

Self Cite

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“…Thermal recovery is the most common and successful technology in heavy oil recovery. − However, a large amount of heat will be consumed in the process of transferring and heating crude oil, especially for the reservoirs with thin reservoir thickness and bottom water. The cold production of heavy oil has received more and more attention, and surfactant emulsification and viscosity reduction technology is one of the most effective methods due to its good viscosity reduction effect, simple process, and low cost. − …”

Section: Introductionmentioning

confidence: 99%

Novel Molecular Insights into the Effects of Ethoxy Group Number on Emulsification and Viscosity Reduction of Anionic–Nonionic Surfactants

Jia,

Song,

Sun

et al. 2023

Energy Fuels

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The high density and viscosity of heavy crude oil seriously affect the production and transportation processes, and surfactant emulsification and viscosity reduction technology are regarded as the ideal methods to enhance oil recovery of heavy oil reservoirs. In the present paper, sodium dodecyl sulfate and sodium dodecyl ether sulfate are used to study the effects of the number of introduced ethoxy (EO) groups on the emulsification and viscosity reduction of surfactants through the experimental method, molecular dynamics simulation, and quantum chemical calculations. The results of optical microscopy and viscosity measurement show that the surfactants can change the emulsion type of heavy oil to cause a remarkable reduction of emulsion viscosity. Then, the molecular density, interfacial thickness, and hydrogen bond relaxation time are computed to study the change of the properties of an interfacial film with additional surfactants. The interaction among surface-active substances is evaluated by radial direction functions and the independent gradient model based on the Hirshfeld partition method, which is confirmed through the steered molecular dynamics simulation method. The simulation results indicate that the surfactants containing more EO groups show better adsorption behavior to enhance the interfacial hydrophilicity and destroy stacking structures among asphaltene and resin molecules, which is conducive to the emulsification and viscosity reduction process. This work presents a nanometer view of the effects of the number of introduced EO groups on the emulsification and viscosity reduction mechanisms of anionic–nonionic surfactants.

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“… 20 evaluated the properties of the emulsions with weak and strong emulsifying agents generated during the surfactant flooding. The viscosity reduction via in situ emulsification was also studied in ref ( 21 ). The authors showed that the O/W emulsion undergoes a decrease in the droplet size while migrating through the porous media.…”

Section: Introductionmentioning

confidence: 99%

“… 27 , 28 An interesting example of silica nanoparticles with a grafted polymer allowed the authors to reversibly stabilize, recover, and break O/W emulsions via pH variation. 29 Surfactant–polymer (see, for instance ref 21 , 30 , 31 ). Surfactant–polymer–nanoparticle systems.…”

Section: Introductionmentioning

confidence: 99%

“…The majority of researchers used silica particles. , An interesting example of silica nanoparticles with a grafted polymer allowed the authors to reversibly stabilize, recover, and break O/W emulsions via pH variation Surfactant–polymer (see, for instance ref ,, ). Surfactant–polymer–nanoparticle systems. The latter system was synthesized on the basis of silica nanoparticle and implemented for the O/W emulsion stabilization in ref .…”

Section: Introductionmentioning

confidence: 99%

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Effect of Composition and Interfacial Tension on the Rheology and Morphology of Heavy Oil-In-Water Emulsions

et al. 2020

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Rheological and morphological properties of heavy crude oil-in-water (O/W) emulsions have been studied. Two series of emulsions were considered: first, the surfactant type remained constant, while the continuous phase content was varied and second, the surfactant type was varied while the continuous phase content remained constant. Under stress-controlled shearing, all samples exhibit viscoplastic behavior. The rheological properties are directly related to the morphology of the emulsions which vary in size of dispersed phase droplets and their inherent structure. Adding a surfactant characterized by a high value of interfacial oil–water tension results in a decrease in the yield stress (which is a measure of the interparticulate structure strength). The same effect is attained by increasing the water content. Meanwhile, these two factors determine the viscosity which can be much lower than that of the basic heavy crude oil if the O/W type of emulsions has been created. Special attention was paid to the viscoelastic properties which have been scarcely reported. Correlations were found between the surfactant properties, composition of the emulsion, and rheological characteristics of emulsions (yield stress, apparent viscosity, and viscoelastic properties), which allows for reduction in the crude oil viscosity down to a low enough level acceptable for pipe transportation.

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Performance of a good‐emulsification‐oriented surfactant‐polymer system in emulsifying and recovering heavy oil

Cited by 12 publications

References 36 publications

High-Efficiency High-Temperature-Resistant Nanosilica Viscosity Reducer for Extra-Heavy Oil Viscosity Reduction

High-Efficiency High-Temperature-Resistant Nanosilica Viscosity Reducer for Extra-Heavy Oil Viscosity Reduction

Novel Molecular Insights into the Effects of Ethoxy Group Number on Emulsification and Viscosity Reduction of Anionic–Nonionic Surfactants

Effect of Composition and Interfacial Tension on the Rheology and Morphology of Heavy Oil-In-Water Emulsions

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