As reservoirs mature, the amount of water produced increases and velocities reduce. Hence, there is a greater likelihood that deposits will collect at low points in a line. Also, in some instances, poor chemical management may lead to a build-up of scale deposits or corrosion products. All of these factors increase the risk of localised corrosion. In parallel with the above, there is a worldwide requirement to extend the life of ageing assets.

This paper reviews the issues associated with establishing adequate corrosion control in systems that contain significant amounts of deposit, be it sand, scale or corrosion products. Laboratory test data is used to illustrate the effects on corrosion inhibition and the possible consequences with respect to integrity management are highlighted.

Examples include:

  • Inhibition of localised corrosion beneath scales

  • The effect of sand beds on inhibition

  • The influence of corrosion product films on inhibitor performance.

Novel test procedures are described and the results and conclusions will demonstrate the importance of actively addressing these issues in inhibitor selection programmes.

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