Asphaltene Deposition Inhibitors in CO2 Flooding: A Review and Future Application Prospects

Abstract

Chemical inhibitors are crucial in addressing asphaltene issues during CO₂ flooding, enhancing oil recovery. These inhibitors chemically modify asphaltene aggregation and deposition, typically featuring functional groups that interact with asphaltene molecules to improve their solvency and dispersion. The problem of asphaltene deposition is a global issue, hindering the extraction and processing of petroleum, making the research on chemical inhibitors for asphaltene deposition crucial. However, due to concerns over the stability, cost, and environmental impact of the inhibitors, it is mainly still at the laboratory stage. Currently, there are few studies on the summary of asphaltene deposition inhibitors. This review analyzes asphaltene deposition mechanisms, their impact on reservoirs, and various types of inhibitors, such as natural organics, surface-active agents, ionic liquids, and nanoparticles. It also fills the gaps in existing research. We not only analyzed the chemical properties and mechanisms of action of these inhibitors but also explored their potential applications and effects under actual oilfield conditions. Furthermore, this review also proposes that future research should focus on evaluating the performance of these novel inhibitors under a broader range of industrial conditions and their long-term impact on the environment, to achieve optimal economic benefits and environmental sustainability. Through these studies, we hope to provide more efficient and environmentally friendly asphaltene solutions for the petroleum industry, thereby promoting scientific and technological progress and industrial development in this field.