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Technical University of Crete
Technical University of Crete
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| URI: | http://purl.tuc.gr/dl/dias/FA90CEF3-5EBC-481A-B3AC-752E2755B3A8 | ||
| Year | 2001 | ||
| Type of Item | Peer-Reviewed Journal Publication | ||
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| Bibliographic Citation | N. Pasadakis, N. Varotsis and N. Kallithrakas-Kontos, "The influence of pressure on the asphaltenes content and composition in oils," Petrol. Sci. Technol., vol. 19, no. 9-10, pp. 1219-1227, Sep.-Oct. 2001. doi: 10.1081/LFT-100108304 https://doi.org/10.1081/LFT-100108304 | ||
| Appears in Collections |
The objective of this work was to investigate the effect of pressure on the concentration of the dissolved asphaltenes in a heavy oil. The asphaltenes content was determined in oil samples, produced at reservoir temperature and different pressures ranging from the initial reservoir pressure to the atmospheric one, using the standard IP143/90 method. Additionally, the content of nine trace metals in the asphaltenes, produced at each pressure step was studied by Total Reflection X-Ray Fluorescence (TXRF). It was found that the amount of the dissolved asphaltenes in oil decreases as pressure falls from the initial reservoir pressure down to bubble point pressure and subsequently increases as the pressure is reduced further. A positive correlation was observed between the concentration of several metals (Ni, V, Cr, Mn) and the dissolved asphaltenes content.
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