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Research Article

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

Yining Wu1( ), Lisha Tang1, Dayu Liu1, Demin Kong2, Liu Kai2, Mengjiao Cao1, Qingshan Zhao2( )
School of Petroleum Engineering, China University of Petroleum (East China), Qingdao 266580, China
State Key Laboratory of Heavy Oil Processing, College of Chemistry and Chemical Engineering, China University of Petroleum (East China), Qingdao 266580, China
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Graphical Abstract

Benzene sulfonate-modified carbon dots (BS-CDs) was synthesized by the in-situ modification electrochemical exfoliation with petroleum coke-asphalt as carbon sources. BS-CDs nanofluid possesses excellent dispersibility, high temperature and salt resistance, and is capable to reduce injection pressure and enhance oil recovery concomitantly.

Abstract

Carbon dots (CDs) show great potential as a new type of oil-displacing agent for unconventional oil and gas development. However, the instability and easy aggregation epitomize the challenges that accompany the application of CDs in high temperature and high salinity (HT/HS) reservoirs. In this research, novel benzene sulfonate-modified carbon dots (BS-CDs) with remarkable thermal stability and salt resistance were fabricated through an in-situ electrochemical exfoliation method. Molecular simulation verifies that the introduction of benzene sulfonate groups substantially strengthens the electrostatic repulsion between BS-CDs, leading to outstanding dispersibility and stability even at a temperature of 100 °C and salinity of 14 × 104 mg/L. Core flooding tests show that 0.05 wt.% BS-CDs nanofluid can significantly reduce the water injection pressure by 50.00% and enhanced oil recovery (EOR) to 68.39% under HT/HS conditions. According to the atomic force microscopy (AFM) scanning results, the adhesion force between the core (after BS-CDs treatment) and oil decreased by 11.94 times, indicating that the hydrophilicity of the core surface was increased. In addition, the distribution of the adhesion force curve is more concentrated, which means that the micro-scale wettability of the core changes from oil-wet to more homogeneous water-wet. This study provides a feasible way for the development and application of good thermal stability and salt resistance CDs in unconventional reservoir development.

Keywords

carbon dotsin-situ modificationthermal stability and salt resistanceinjection pressure reductionenhanced oil recovery

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Nano Research
Volume 16 Issue 10,
October 2023
Pages 12058-12065
DOI: 10.1007/s12274-022-5083-y
Cite this article:
Wu Y, Tang L, Liu D, et al. In-situ synthesis of high thermal stability and salt resistance carbon dots for injection pressure reduction and enhanced oil recovery. Nano Research, 2023, 16(10): 12058-12065. https://doi.org/10.1007/s12274-022-5083-y
Topics:
Amorphous carbon
Part of a topical collection:
70th Anniversary of China University of PetroleumThe 70th Anniversary of China University of Petroleum

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Received: 04 August 2022
Revised: 06 September 2022
Accepted: 20 September 2022
Published: 05 December 2022
© Tsinghua University Press 2022
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