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Mitigating Asphaltene Deposition in CO2 Flooding with Carbon Quantum Dots

Authors :
Qi Liu
Yangwen Zhu
Hang Ye
Haiying Liao
Quanqi Dai
Michelle Tiong
Chenggang Xian
Dan Luo
Source :
Energies, Vol 17, Iss 11, p 2758 (2024)
Publication Year :
2024
Publisher :
MDPI AG, 2024.

Abstract

Carbon capture, utilization, and storage (CCUS) technology has emerged as a pivotal measure in mitigating global climate change. Notably, CO2-EOR is esteemed for its dual function of sequestering CO2 and enhancing oil recovery. However, this process presents challenges related to asphaltene deposition during CO2 flooding, leading to reservoir damage, such as pore plugging. This study systematically manipulated the factors inducing CO2-induced asphaltene deposition, elucidating the mechanisms and magnitudes of asphaltene precipitation. Additionally, the study investigated the efficacy of carbon quantum dots (CQDs) in mitigating asphaltene deposition. Experimental findings indicated a positive correlation between asphaltene deposition and level of asphaltene content, CO2 injection ratio, and temperature. Moreover, with an increase in experimental pressure, the asphaltene deposition rate demonstrated an initial increase followed by a subsequent decline. Leveraging their favorable compatibility with asphaltene, CQDs effectively suppressed the aggregation behavior of asphaltene. In the presence of CQDs, the onset of asphaltene precipitation was delayed from 45 V% to 55 V%, with the highest inhibition rate reaching approximately 36% at an optimal CQD concentration of 20 mg/L. This study proposes a novel approach to address asphaltene deposition issues in CO2-EOR processes, contributing to the enhancement of recovery rates in low-permeability reservoirs.

Details

Language :
English
ISSN :
19961073
Volume :
17
Issue :
11
Database :
Directory of Open Access Journals
Journal :
Energies
Publication Type :
Academic Journal
Accession number :
edsdoj.fe07fda92fb4bf790a2c5106fbd36e3
Document Type :
article
Full Text :
https://doi.org/10.3390/en17112758