WebMay 16, 2007 · Improved prediction of the onset of asphaltene precipitation may be achieved using refractive index (RI) to characterize crude oils and their mixtures with … Refractive index (RI) measurement is a powerful tool in determining onset of asphaltene precipitation when a crude oil sample is titrated with a precipitant. It is also a useful method for creating correlations with other properties of crude oil such as solubility parameter and density. Because of the polarizability … See more This method is used to obtain the asphaltene onset pressure (AOP) associated with a live oil sample when it undergoes an isothermal depressurization process in a PVT cell … See more This method is established based on the idea of describing an asphaltenic crude as a “colloidal suspension” when asphaltene particles precipitate out of the solution. Based on the extensive research conducted in the … See more It is believed that the presence of heteroatoms such as oxygen, nitrogen and sulfur in asphaltenes makes it possible to consider this fraction of oil to have a “surfactant-like … See more Optical microscopy was used by several researchers to detect onset of asphaltene precipitation when a crude oil is titrated with increasing concentration of a precipitant at ambient … See more
Petroleum Science and Technology (1998) 16 , No. 3 …
WebFeb 1, 2016 · Refractive index (RI) provides valuable information about various reservoir engineering calculations, making it a key parameter for characterizing crude oils. Determination of this index through experiment is capital-intensive, time consuming, and also toil. Hence, it is essential to search for an efficient and accurate estimation of crude … http://baervan.nmt.edu/groups/petrophysics/media/pdf/intro-2-asphaltenes.pdf robert mugabe deaths
Reversible Description of Asphaltene Colloidal Association and ...
WebFeb 14, 2007 · The refractive index of asphaltenes was predicted from the refractive index data of crude oils. The results suggest the possibility predicting the properties and … WebJun 2, 2015 · The asphaltene is assumed to have the solubility parameter of the best solvent. ... showed that the measurements of the refractive index of crude oils can be used to determine the solubility parameters required for the Flory-Huggins model. The Hirschberg et al. approach also has been used with some degree of success by: Burke et al., WebMay 16, 2007 · The interaction energy of asphaltene molecules or aggregates in a medium of oil can be expressed as a function of the difference between the RI of asphaltene and oil. The RI of live crude oil during pressure depletion can be calculated from the RI of the stock tank oil, the molar refraction of the separator gas, the formation volume factor B o ... robert mugabe leadership style