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Institutional Repository [SANDBOX]
Technical University of Crete
Technical University of Crete
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| URI: | http://purl.tuc.gr/dl/dias/8D552D4D-7653-489D-B019-DB6A0AA21699 | ||
| Year | 2005 | ||
| Type of Item | Conference Full Paper | ||
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| Bibliographic Citation | S. Sfakiotakis, N. Pasadakis, N. Varotsis and H.P. Hjermstad. (2005, Apr.). Qualitative and quantitative study of asphaltenes precipitation during gas injection project. Presented at 13th European Symposium on Improved Oil Recovery[Online]. Available: file:///C:/Users/hara/Downloads/4_International_Fossil_Fuels_Qualitative_and_quantitative_study_EAGE_IOR%20(1).pdf | ||
| Appears in Collections |
Laboratory and field data from the Snorre reservoir oil in the North Sea confirm that asphaltenes,due to the fact that they precipitate when the oil in which they are contained is subjected toconsiderable compositional changes, can be used as a natural tracer for monitoring the success ofa gas miscible flooding during IOR projects.The field data reveal that the change of GOR in producing wells affects the asphaltenes contentof the producing oil only in the cases where injection gas has gone into solution. A series ofsingle and multiple -both forward and backward- contacts were performed in the laboratory tosimulate the compositional changes that the Snorre reservoir oil undergoes during a gas injectionproject. The asphaltenes solubility during the single contacts was reduced by increasing theamount of dissolved gas in the oil. During the forward contacts, asphaltenes precipitationincreased as the number of contacts increased, while during the backward contacts, the oppositetrend was observed.Furthermore, compositional characterisation of the precipitated asphaltenes produced underdifferent experimental conditions provides a better understanding of the precipitation process.
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