Asphaltene deposition can arise during normal production causing formation damage, precipitation in tubing, difficulties in wireline operations, stuck valves and lost production.

Identifying which type of crudes will display this behaviour, prior to full production, enables the operator to make remedial plans.

A short description of a thermodynamic model to predict the onset parameters (temperature, pressure) will be described along with the essential experimental data required as input for subsequent modelling studies. This will be supported via model validation from real field data from two of BPX's North Sea fields.

A key conclusion of the findings is the ability to predict the deposition of asphaltenes downhole without the need for generating data from expensive single phase downhole samples.

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