Research progress on supercritical CO thickeners
According to the thickening principle and molecular structure of thickeners, supercritical carbon dioxide (scCO 2 ) thickeners have been summarized and introduced by dividing into polymers, small molecular compounds and surfactants. The properties such as solubility, thickening effect, thickening co...
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Veröffentlicht in: | Soft matter 2021-05, Vol.17 (2), p.517-5115 |
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Zusammenfassung: | According to the thickening principle and molecular structure of thickeners, supercritical carbon dioxide (scCO
2
) thickeners have been summarized and introduced by dividing into polymers, small molecular compounds and surfactants. The properties such as solubility, thickening effect, thickening condition and existing problems of scCO
2
thickeners are analyzed and assessed, and the research progress and prospects of scCO
2
thickeners are proposed. ScCO
2
is used in both CO
2
fracturing and CO
2
flooding for enhanced oil recovery (EOR). However, due to its low viscosity, the proppant carrying ability and filtration control ability of scCO
2
are too weak for fracturing. Also, in the process of CO
2
flooding, its low viscosity not only exacerbates the gravity override but also leads to an unfavorable mobility ratio that results in viscous fingering, early breakthrough, and poor sweep efficiency. Therefore, scCO
2
thickeners have good application prospects in oil and gas production for improved oil recovery (IOR).
According to the thickening principle and molecular structure of thickeners, supercritical carbon dioxide (scCO
2
) thickeners have been summarized and introduced by dividing into polymers, small molecular compounds and surfactants. |
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ISSN: | 1744-683X 1744-6848 |
DOI: | 10.1039/d1sm00189b |