51313-02391-How Do Inhibitors Mitigate Corrosion in Oil-Water Two Phase Flow Beyond Lowering the Corrosion Rate?

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Product Number: 51313-02391-SG

ISBN: 02391 2013 CP

Author: Sonja Richter

Publication Date: 2013

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Corrosion inhibitors are commonly used to mitigate corrosion in oil and gas pipelines and the choice of inhibitor for a particular oil field depends on the conditions of the field (oil chemistry water chemistry temperature etc.). In order to find the optimum formulation for each field condition extensive laboratory tests are carried out which include corrosion inhibition foaming and emulsion to name a few. When it comes to measuring the inhibition efficiency of the corrosion inhibitor formulation the focus is on the inhibition from the water phase. However corrosion inhibitors can have an additional advantage of altering the wettability of the steel surface from hydrophilic (water wet) to hydrophobic (oil wet) by forming a hydrophobic adsorption layer on the steel surface. In the current work the ability of corrosion inhibitors to alter the wettability of the steel is investigated by measuring the static contact angle in a goniometer as well as the dynamic wetting with a small scale flow apparatus called a doughnut cell especially designed for this purpose. The doughnut cell makes it possible to measure the water and oil wetting of a steel surface using flush mounted conductivity pins that detect whether water (conductive fluid) or oil (nonconductive fluid) are covering the surface. Two inhibitors were tested quaternary ammonium chloride and fatty amino and beside lowering the corrosion rate the inhibitors were found to lower the oil-water interfacial tension facilitating water entrainment in the oil phase so water could be entrained at lower oil velocity and to change the surface wettability from hydrophilic to hydrophobic. The doughnut cell is a tool that can be used to help optimizing the inhibitor dosage and maximizing its value. It can also be used in new field development where enhanced oil wetting could be factored into the corrosion allowance calculation.