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Revista de la Facultad de Ingeniería Universidad Central de Venezuela
versión impresa ISSN 0798-4065
Resumen
LOPEZ, Liliana; QUINTERO, Karla; LUGO, Patricia y LO MONACO, Salvador. Effects of steam injection on chemical composition of oils. Rev. Fac. Ing. UCV [online]. 2011, vol.26, n.3, pp.83-95. ISSN 0798-4065.
In order to know the changes in SARA composition (saturated, aromatics, resins and asphaltenes), major (C, S), trace (V, Ni) elements, functional groups in the asphaltenes fraction and biomarkers (terpanes and steranes) in oils from wells under steam injection, 20 samples were studied from Lagunillas field (Maracaibo Basin) taken from a well without stem injection (LS-SE), two wells in a first cycle (LS-A, LS- B), and a well in the second cycle (LS-C) of steam injection. Oils analyzed are extra heavy ones (< 10 °API), enriched in NSO compounds (resins and asphaltenes) related to hydrocarbons (saturated and aromatic), exhibit high S, V and Ni concentrations, and are biodegraded (level 6-7). Despite the biodegradation it is possible to determine that the source rock is the result of sedimentation in a marine environment, with input of terrestrial organic matter, and crude oils were generated in a mature stage. Differences in SARA composition and functional groups in asphaltenes fraction were attributable to steam injection, without appreciable C concentration and V/Ni relationships. Also, and small variations in S concentration were observed. The similarity between all mass chromatograms for the oils obtained from the well without steam injection and wells with steam injection, indicate that during this process, the terpanes and steranes are unchanged, or their changes cannot be detected. The V/Ni ratio shows little variations in the different oils tested and therefore could be used to correlate oils from wells submitted to steam injection, which can be extrapolated for use in commingled production in reservoirs whose oils exhibit different V/Ni ratio.
Palabras clave : Maracaibo basin; Lagunillas field; Steam injection; SARA; Biomarkers; V/Ni ratio.