In a previous work, a thermodynamic model was proposed to predict the chemical speciation of the
condensate at the top of the line. In this work, this thermodynamic approach was validated by field
studies at an onshore oil and gas field. A review of the concepts and techniques for field analysis of
organic acids was presented. Additionally, some practical considerations regarding the collection of
field samples for the analysis of organic acids and the determination of the corrosivity of the condensed
liquids at the top of the line were explored. Using thermodynamic theory, a novel technique of sample
collection for organic acid analysis was developed. The possible sources of organic acids in oil and gas
operations, such as the impact of acid stimulation jobs on organic acid concentrations in well fluids,
were also investigated.
Key words: organic acid, top of line corrosion, condensed water chemistry, acid stimulation