ABSTRACT:

When dealing with a new field development project, a big concern of oilfield chemists is to identify as soon as possible potential problems, in order to make it possible to set-up all the necessary facilities and plan, if needed, periodic interventions or continuous inhibition programmes. A first attempt to realize a tool to address this problem was developed by Shell and published in 1992[1]: the so-called "de-Boer plot", where by plotting the difference between reservoir pressure and bubble pressure vs. the live oil density at reservoir conditions, it was possible to have some indications on the asphaltene deposition danger.Because of the need to predict and resolve asphaltene deposition problems in assets worldwide over the past fifteen years, Eni has accumulated a large body of knowledge, and developed new tools, like solvents, models, etc. along with a significant operational experience on asphaltene problems of variable intensity. Another outcome of these experiences is the tool described in this paper: from the position of the representative point on a graph (oil density) vs. (onset of asphaltene precipitation) it is possible to establish easily if asphaltene deposition should be addressed as an issue or if the probability of such problems is negligible. The approach discussed here is more informative than the original deBoer plot, since it includes experimental information about the specific properties of individual asphaltene-oil systems, and requires only moderate laboratory testing

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