Affiliation:
1. Beijing Key Laboratory of Optical Detection Technology for Oil and Gas, China University of Petroleum (Beijing), Beijing 102249, China
2. National Key Laboratory of Petroleum Resources and Engineering, China University of Petroleum (Beijing), Beijing 102249, China
3. State Key Laboratory of Heavy Oil Processing, China University of Petroleum (Beijing), Beijing 102249, China
Abstract
Supercritical carbon dioxide (CO2) has extremely important applications in the extraction of unconventional oil and gas, especially in fracturing and enhanced oil recovery (EOR) technologies. It can not only relieve water resource wastage and environmental pollution caused by traditional mining methods, but also effectively store CO2 and mitigate the greenhouse effect. However, the low viscosity nature of supercritical CO2 gives rise to challenges such as viscosity fingering, limited sand–carrying capacity, high filtration loss, low oil and gas recovery efficiency, and potential rock adsorption. To overcome these challenges, low–rock–adsorption thickeners are required to enhance the viscosity of supercritical CO2. Through research into the literature, this article reviews the solubility and thickening characteristics of four types of polymer thickeners, namely surfactants, hydrocarbons, fluorinated polymers, and silicone polymers in supercritical CO2. The thickening mechanisms of polymer thickeners were also analyzed, including intermolecular interactions, LA–LB interactions, hydrogen bonding, and functionalized polymers, and so on.
Funder
National Natural Science Foundation of China
National Key Laboratory of Petroleum Resources and Engineering, China University of Petroleum
Reference79 articles.
1. Influence of pressure, temperature and organic surface concentration on hydrogen wettability of caprock; implications for hydrogen geo–storage;Muhammad;Energy Rep.,2021
2. Influence of organic molecules on wetting characteristics of mica/H2/brine systems: Implications for hydrogen structural trapping capacities;Muhammad;J. Colloid Interface Sci.,2022
3. Sherif, F., Ahmed, E.-T., Hesham, A., Youssef, E., and Abdulmohsin, I. (2020, January 1–3). Increasing Oil Recovery from Unconventional Shale Reservoirs Using Cyclic Carbon Dioxide Injection. Proceedings of the SPE Europec, EAGE Conference and Exhibition, Virtual.
4. Characterizing Pore–Scale Geochemical Alterations in Eagle Ford and Barnett Shale from Exposure to Hydraulic Fracturing Fluid and CO2/H2O;Sean;Energy Fuels,2020
5. Effects of crude oil characteristics on foaming and defoaming behavior at separator during CO2 flooding;Zhang;Colloids Surf. A Physicochem. Eng. Asp.,2020