In-situ synthesis of high thermal stability and salt resistance carbon dots for injection pressure reduction and enhanced oil recovery

Wu, Yining; Tang, Lisha; Liu, Dayu; Kong, Demin; Liu, Kai; Cao, Mengjiao

doi:10.1007/s12274-022-5083-y

Cited by 13 publications

(6 citation statements)

References 36 publications

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“…It has important research value in the field of unconventional reservoir development. − The synthesis of carbon quantum dots encompasses primarily two approaches: bottom-up and top-down methods. The bottom-up method has a more application value because of its high product yield, low experimental condition, and simple operation. , Microwave-assisted synthesis has the characteristics of a short reaction time and uniform heating. Zhu et al synthesized dark brown carbon dots by microwave pyrolysis using glucose and polyethylene glycol (PEG-200).…”

Section: Introductionmentioning

confidence: 99%

“…The bottom-up method has a more application value because of its high product yield, low experimental condition, and simple operation. 26,27 Microwaveassisted synthesis has the characteristics of a short reaction time and uniform heating. Zhu et al 28 synthesized dark brown carbon dots by microwave pyrolysis using glucose and polyethylene glycol (PEG-200).…”

Section: Introductionmentioning

confidence: 99%

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Carbon Dot Nanomaterials with High Interfacial Activity for Unconventional Reservoir Development

Liu,

Sun,

Wang

et al. 2024

ACS Appl. Nano Mater.

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Carbon dot nanomaterials (<10 nm) exhibit superior application prospects as oil displacement materials for unconventional reservoir development. However, the limited oil−water and oil−solid interfacial activity of carbon dot nanomaterials restricts their broader application. In this study, carbon dot nanomaterials (CDs) are expeditiously prepared via a microwave-assisted synthesis method utilizing urea and citric acid as precursor compounds. OAB-modified active carbon dot nanomaterials (OCDs) are prepared by grafting oleic acid amidopropyl betaine (OAB) through hydrothermal reaction at 90 °C for 5 h using CDs as a carbon dot carrier. Stability experiments show that the plentiful hydrophilic groups present on the surface of the OCD augment electrostatic repulsion among them, thereby imparting dispersibility, temperature tolerance (90 °C), and salt resistance (2.6 × 10 4 mg/L). Additionally, OCDs demonstrate optimal effectiveness at a concentration of 0.5 wt %. At this concentration, OCDs can reduce the interfacial tension to 0.66 mN/m and achieve the underwater oil contact angle to 126°. Within 24 h, OCDs can strip 60.6% of the oil film. OCDs show the excellent ability to enhance oil−water and oil−solid interfacial activity. Meanwhile, OCD nanofluids can effectively form emulsions with crude oil and spontaneously demulsify within 2 h in a state. Core flooding tests demonstrate that OCD nanofluids, when compared with simulated formation water, reduce injection pressure by 46.3% and enhance oil recovery by 31.1%. This study offers a promising solution for the efficient development of unconventional reservoirs with carbon dot nanomaterials.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Carbon Dot Nanomaterials with High Interfacial Activity for Unconventional Reservoir Development

Liu,

Sun,

Wang

et al. 2024

ACS Appl. Nano Mater.

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“…Besides SiO2 nanoparticles, carbon nanomaterials, particularly carbon quantum dots (CQDs), are considered to possess significant potential for EOR. Wu et al [3] investigated the dispersion stability of CQDs in high-temperature and high-salinity environments, which provides a potential avenue for the practical application of CQDs in foam-assisted EOR. Sakthivel et al [4] demonstrated that the addition of CQDs increases the surfactant-based foam film thickness and suppresses drainage and coalescence effects, thereby enhancing foam stability.…”

Section: Introductionmentioning

confidence: 99%

Influence of carbon quantum dots on foam stability: a molecular dynamics study

Zhao,

Chen,

Zhang

et al. 2024

J. Phys.: Conf. Ser.

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Carbon quantum dots are employed in foam for enhanced oil recovery. This study focuses on the impact of carbon quantum dots on the stability of oil displacement foam. Molecular dynamics simulations are conducted to investigate commonly used models of carbon quantum dots and surfactant foams in oil displacement. The research delves into the interfacial properties of the foam film, the flow characteristics of water molecules, and the interaction between carbon quantum dots and surfactants. Insights gained from these three aspects reveal the influence of carbon quantum dots on surfactant foam films. This work provides theoretical guidance for the utilization of carbon nanomaterials in foam-assisted oil recovery.

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“…Moreover, Sakthivel et al proved that after the addition of carbon nanomaterials, the foam stability under high pressure, high temperature, and high salinity reservoirs was significantly improved, which slowed the drainage of free liquid and retarded the Ostwald ripening phenomenon in foam systems. Numerous efforts have been dedicated to the design and synthesis of various CDs. − However, the temperature resistance and salt tolerance of CDs are limited to a temperature of 100 °C and a salinity of 14 × 10 4 mg/L, and further improvement is very challenging, restraining the application potential in ultrahigh temperature and ultrahigh salinity reservoirs (with temperature surpassing 120 °C and salinity above 15 × 10 4 mg/L). On the other hand, the strong hydrophilicity of carbon-based nanomaterials induces high interfacial tension and limits oil–water interfacial activity, while how to enhance the interfacial activity of CDs has seldom been reported in previous studies.…”

Section: Introductionmentioning

confidence: 99%

“…Carbon-based nanomaterials as an emerging nanomaterial have great potential due to their ultrasmall size (<10 nm), wide source of raw materials, good dispersion stability, and excellent temperature and salt resistance. , In accordance with the harsh reservoir conditions such as high temperature, high salt concentration, and ultralow permeability, carbon-based nanomaterials have more advantages than traditional nanomaterials. , Ranjbar et al used citric acid and urea as raw materials to synthesize carbon dots (CDs) via an easy and fast microwave-assisted carbonization method for oil field tracing and oil displacement. Zhao et al prepared temperature-resistant and salt-resistant carbon-based active nanoparticles with hydrophilic carbon nanoparticles (CNPs) and Tween-80 as the main materials and enhanced oil recovery through spontaneous imbibition in tight reservoirs.…”

Section: Introductionmentioning

confidence: 99%

Carbon-Based Active Nanoparticles with Ultrahigh Temperature and Salt Resistance for Enhanced Oil Recovery from Unconventional Oil Reservoirs

Sun,

Dong,

Zhu

et al. 2023

Energy Fuels

Self Cite

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Carbon-based nanoparticles possess ultrasmall size (<10 nm) and show great application potential in reducing the injection pressure of unconventional reservoirs. However, the strong hydrophilicity of carbon nanoparticles limits the oil−water interfacial activity, which hinders the further improvement of oil recovery. In this study, active carbon dots (S-CDs) are synthesized through two-step hydrothermal reactions by first preparing carbon dot (CD) carriers from citric acid and ethylenediamine and then grafting cocamidopropyl-N,N-dimethylglycine and characterizing them by high-resolution transmission electron microscopy, atomic force microscopy, Fourier transform infrared spectroscopy, and Xray photoelectron spectroscopy. The stability experiment verifies that the abundant hydrophilic groups on the surface substantially enhance the electrostatic repulsion between S-CDs, and the absence of carboxyl groups avoids the reaction with other groups, which endows S-CDs with intrinsic aqueous dispersibility and resistance to high temperature (130 °C) and high salinity (16 × 10 4 mg/L). In addition, S-CDs with an average hydration particle size of 2.84 nm exhibit excellent oil−water and oil−solid interfacial activity by controlling the interfacial tension, interfacial viscoelastic modulus, wettability alteration, and adsorption capacity. Core flooding tests show that 0.05 wt % S-CD nanofluids can reduce the injection pressure by 32.92% and increase the oil recovery rate by 19.15% compared to simulated formation water.

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In-situ synthesis of high thermal stability and salt resistance carbon dots for injection pressure reduction and enhanced oil recovery

Cited by 13 publications

References 36 publications

Carbon Dot Nanomaterials with High Interfacial Activity for Unconventional Reservoir Development

Carbon Dot Nanomaterials with High Interfacial Activity for Unconventional Reservoir Development

Influence of carbon quantum dots on foam stability: a molecular dynamics study

Carbon-Based Active Nanoparticles with Ultrahigh Temperature and Salt Resistance for Enhanced Oil Recovery from Unconventional Oil Reservoirs

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