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Petrophase determined the biological origin of the contaminant and reported on the toxicity and potential effect on catalysts. The trimethlyarsine concentrations at various stages during processing were modelled using an equation of state model incorporating the appropriate properties of trimethlyarsine. This model was used to see the effects of the partitioning of trimethlyarsine in the sea line and through production to export streams. Thus the effect of different processing conditions on the export compositions could be assessed. The levels predicted from the model, which were later confirmed by measurement, showed that processing alone was sufficient to keep streams within specification and to safe levels.

Thiol prediction in future production

The Problem

A large gas-condensate field with a gravitational compositional gradient had a range of thiols as containments; methythiol ethylthiol, isobutlythiol and heavier thiols. The thiol concentrations would change as the field depleted into the retrograde region. Future concentrations were needed to select appropriate plant metallurgy for field life.


Surface production streams were analysed for both hydrocarbons and sulphur species and mathematically recombined the give the wellstream composition. Concentrations above and below the producing zone were predicted using equation of state modelling incorporating the effect of gravity.