An amphiphilic nano calcium carbonate: Preparation, emulsification, interface properties, and displacement mechanism in low permeability reservoir

Tian, Kaiping; Pu, Wanfen; Wang, Qianlong; Liu, Shun; Li, Siying

doi:10.1016/j.colsurfa.2023.132172

Cited by 4 publications

(1 citation statement)

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“…The technique most frequently employed in oil extraction is water flooding . Nonetheless, the reservoirs contain at least 50% residual oil following an extended period of water flooding. , According to earlier research, blind end, columnar, cluster, and membranous residual oils are the four primary forms of residual oil that are left over after water flooding. − Due to the heterogeneity of the formation, the high oil–water interfacial tension, and the strong lipophilicity of the rock surface, these residual oils cannot be flooded out by injection water. Many studies have shown that if we want to exploit these residual oils, we must optimize the function of the oil flooding system to increase the oil displacement efficiency.…”

Section: Introductionmentioning

confidence: 99%

A Feasibility Study on Enhanced Oil Recovery of Modified Janus Nano Calcium Carbonate-Assisted Alkyl Polyglycoside to Form Nanofluids in Emulsification Flooding

Tian,

Pu,

Wang

et al. 2024

Langmuir

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Emulsification flooding can effectively enhance crude oil recovery to solve the problem of petroleum shortage. In this work, a modified Janus Nano Calcium carbonate (JNC-12) with a particle size of 30−150 nm was synthesized, and an in situ emulsification nanofluid (ISEN) was prepared with JNC-12 and alkyl polyglycoside (APG). Scanning electron microscope (SEM) showed that the dispersion of JNC-12 in air or APG solution was better than Nano Calcium carbonate (Nano CaCO 3 ). The emulsification properties, interfacial tension, and expansion modulus of ISEN were studied, and the result showed that with the increase in salinity, the emulsification rate decreased, the water yield rate increased, the interfacial tension first decreased and then increased, and the expansion modulus first increased and then decreased. With the increase in temperature, the emulsification rate, emulsion viscosity, and interfacial tension decreased. With the increased oil−water volume, the water yield rate and the emulsion viscosity increased. With increase in the concentration of JNC-12, the water yield rate, the emulsion viscosity, and the interfacial tension decreased but the expansion modulus increased. The emulsion generated by emulsifying ISEN with crude oil was an O/W emulsion, the crude oil viscosity was 4−10 times that of emulsion, and the average particle size of emulsion was 1.107 μm. The addition of ISEN caused the decrease in interfacial tension of oil−water to 0.01−0.1 mN/m. The wettability alteration experiment found that ISEN could change the lipophilic rock to hydrophilic rock. Finally, the core displacement experiments showed that compared with the first water flooding, the oil recovery of the second water flooding after ISEN flooding enhanced by 17.6%. This research has important guiding significance for in situ emulsified nanofluid flooding to enhance oil recovery.

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