Relationship of Various Interfacial Tensions of Surfactants/Brine/Oil Formulations to Oil Recovery Efficiency

Chung, Jaeyub; Holtsclaw, Jeremy; Henderson, Timothy; Everett, Thomas A.; Schultheiss, Nathan; Boudouris, Bryan W.; Franses, Elias I.

doi:10.1021/acs.energyfuels.0c04382

Cited by 4 publications

(1 citation statement)

References 35 publications

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“…The ultralow interfacial tension usually relies on the synergistic effect of alkali and surface activator. Herein, the surfactant plays the key role, while the type and addition of alkali is to improve the ultralow interfacial tension range and stability of the surface activator. − The addition of alkali substantially increases the formation damage and also accelerates the scaling and corrosion loss in all aspects of surface injection and recovery, which greatly increases the cost of oil recovery in the ternary composite drive mine. Hence, an alkali-free ternary emulsification system with efficient oil drive effect, low cost of chemicals, and light scaling has urgent demand.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of Component Transfer and Oil Drive of Nonalkali Ternary Emulsion Systems

Liu,

Wu,

et al. 2023

ACS Omega

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So far, alkali/surfactant/polymer flooding is widely used in oilfields to improve recovery. However, the introduction of alkali to the ternary composite leads to substantial damage formation, accelerates the scaling and corrosion loss in all aspects of surface injection and recovery, and consequently increases the cost of oil recovery in the ternary composite drive field. Therefore, environmentally friendly means are in urgent demand. Alternatively, a new non-alkali ternary drive system with salt instead of alkali has been developed based on the basis of ternary composite drive in the Daqing oilfield. In this experiment, a mathematical model of oil repelling by a salt-substituted alkali-free ternary emulsion system is formed, followed by the verification of the wet-lab experiments. The results show that the alkali-free ternary emulsion system can have a synergistic effect of complex salt and petroleum sulfonate surfactant and represents a wide range of ultralow interfacial tensions and good oil-repelling performances. The chromatographic separation occurs in the transmission process due to the adsorption of porous media, and the lower the permeability and the lower the injection rate, the higher the chromatographic separation degree. The use of multistage plug injection can narrow the difference of flow rate between high and low permeability layers and improve the recovery rate to 61.59%. Herein, the results provide theoretical guidance for the application of an alkali-free ternary emulsification system.

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Section: Introductionmentioning

confidence: 99%

Numerical Simulation of Component Transfer and Oil Drive of Nonalkali Ternary Emulsion Systems

Liu,

Wu,

et al. 2023

ACS Omega

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Microemulsion and interfacial properties of anionic/nonionic surfactant mixtures based on sulfonate surfactants: The influence of alcohol

Mei²,

Lai³

2023

Journal of Molecular Liquids

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Experimental Study and Molecular Dynamics Simulation of Oil Displacement Using Different Microemulsions in the Fang2 Block of Songfangtun Oilfield

Zhang,

Zhou,

et al. 2024

ACS Omega

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After many years of mining in the Fang2 block of the Songfangtun oilfield, the conventional water drive development method can no longer meet the requirement of greatly improving the recovery rate, and ternary composite drive (TCD) technology is adopted for this purpose. TCD is one of the most important methods to further improve crude oil recovery, and it has entered the industrialization and promotion stage, but there are still problems of fouling in the injection and extraction system and high production and maintenance costs. In order to reduce formation damage and improve recovery in the Songfangtun oilfield, an alkalifree microemulsion system was developed by replacing the weak base sodium carbonate with sodium chloride, but its emulsification capacity was weak and the recovery enhancement value was lower than that of the weak base TCD. In order to improve the emulsification performance of the alkali-free microemulsion and enhance the effect of oil repulsion, an alkali-free microemulsion oilrepellent system was developed on the basis of the alkali-free ternary system by using the compounding of surfactant, alcohol, and sodium chloride. Through indoor physical modeling experiments, it was concluded that the SDBS alkali-free microemulsion system had the best effect on improving crude oil rheology and viscosity reduction, and the lowest interfacial tension of 9.4 × 10 −4 mN/m in the solution system when the mass fraction was 4%, with the maximum recovery rate of 47.03%, and the decrease in water content of 9.3%. Through molecular dynamics simulation and microemulsion oil-repellent coefficient, it is concluded that the alkali-free SDBS microemulsion system can greatly reduce the interaction force between crude oil and rock, with the lowest peak value of radial distribution function of 4.21, and the oil-repellent coefficient of F p of 5.85; CMG reservoir numerical simulation software is adopted to verify the chemical repellent numerical simulation of Fang2 block, which shows that the recovery degree of SDBS alkali-free microemulsion system is 24.8% higher than that of water repellent, with the cumulative increase of 213.6 thousand tons of oil. The developed alkali-free microemulsion system not only realizes the goal of ternary composite alkalinity-free but also achieves the purpose of greatly improving the recovery rate and reducing the cost and increasing efficiency. It has a broad application prospect and can also provide a technical reference for the efficient development of other old oilfields with land-phase sandstone.

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Relationship of Various Interfacial Tensions of Surfactants/Brine/Oil Formulations to Oil Recovery Efficiency

Cited by 4 publications

References 35 publications

Numerical Simulation of Component Transfer and Oil Drive of Nonalkali Ternary Emulsion Systems

Numerical Simulation of Component Transfer and Oil Drive of Nonalkali Ternary Emulsion Systems

Microemulsion and interfacial properties of anionic/nonionic surfactant mixtures based on sulfonate surfactants: The influence of alcohol

Experimental Study and Molecular Dynamics Simulation of Oil Displacement Using Different Microemulsions in the Fang2 Block of Songfangtun Oilfield

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