Batch corrosion inhibitors are widely used for the corrosion control of production wells and
pipelines in the oil and gas industry. Rules of thumb that incorporate film thickness, contact
time and surface area are still commonly used to calculate the volume of batch inhibitor
required for pipeline applications. Measuring the actual thickness of the inhibitor film on the
metal and the impact of different variables on the film (e.g. inhibitor type, contact time, diluent
type, dilution ratio, shear stress) offer the potential to provide a better understanding for
optimizing the application procedure and required batch frequency. Optical profiling (or white
light interferometry) has long been a standard technique for non-contact, 3D measurement of
surface topography. This method has now been extended to thickness measurements of
semi-transparent batch inhibitor films. In this paper, the impact of several variables (i.e.
inhibitor type, contact time, diluent ratio, shear stress) on batch inhibitor films was studied
using an optical profiler to advance our knowledge of batch inhibitor application techniques and
to optimize batch programs (e.g. film persistency, batch frequency).
Keywords: batch corrosion inhibitors, film thickness, optical profiler