Abstract
Asphaltene instability is an important problem in flow assurance, especially for wells and for the particular case of commingled production that can lead to oil incompatibility. It is, therefore, important to assess the probability of asphaltene deposition in the first stages of field development. Toward this end, several correlations have been proposed, such as the Asphaltene Stability Index and the deBoer plot. More detailed models have been proposed that are able to estimate the range of pressures at which asphaltene deposits are expected. Among these models, one of the most popular approaches is based on the concept of the solubility parameter, as it is believed that the quality of the solvent is a critical parameter in the stability of asphaltenes in oil. These models have successfully been used to estimate the onset of asphaltene deposition in field conditions. The models use the oil and asphaltene solubility parameters. Their values are simultaneously estimated by means of onset flocculation experi...
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