Abstract

Aim: This study was aimed to characterize the anticorrosion and antiscale performances of production chemicals (corrosion inhibitor and scale inhibitor) used in the crude oil expedition line of an oil and gas facility which typically represents a multiphase oil-water-gas system.

Method and Materials: The residual amine and antiscale concentrations of produced water from crude oil obtained from an oil and gas installation representing a multiphase oil-water-gas system were analysed using a HACH Atomic Absorption Spectrometer (AAS). The corrosion inhibitor used consist primarily of imidazoline while the scale inhibitor is made up of poly phosphocarboxylic acid.

Results: Results of the produced water obtained from the Medium Pressure (MP) Separator showed that the residual amine at corrosion inhibitor concentrations of 15.0 – 20.0 mg/l were within Environmental Guideline and Standards for Petroleum Industries in Nigeria (EGASPIN) specification of 5.0 – 10 mg/l. Results of the produced water obtained from the Low Pressure (LP) Separator shows that the residual antiscale at scale inhibitor concentrations of 10.0 – 15.0 mg/l were within EGASPIN acceptable limit of 5.0 – 10.0 mg/l..

Conclusion: It was concluded that concentrations of the residual amine and antiscale of the produced water obtained from crude oil samples provide useful information on the effectiveness of corrosion inhibitors and scale inhibitors respectively.

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