Clariant Oil Services Develops Environmentally friendly Corrosion Inhibitor

• Improved environmental profile through replacement of a substitution warning product
• Exceptional corrosion performance reduces the likelihood of corrosion-related environmental incidents
• Methanol-compatible inhibitor controls both corrosion and hydrates in one application 

Background

A major international oil company operates a 30-inch wet gas export pipeline in the UK. The incumbent corrosion inhibitor was dosed into methanol onshore before being pumped offshore for field deployment. The methanol acts as a carrier for the inhibitor and also affords hydrate protection to the pipeline.

In order to simplify operations, there was a requirement to develop a pre-mixed product suitable for offshore deployment. The incumbent product has a substitution warning; therefore, in order to improve the operator’s environmental profile, an environmentally-acceptable alternative was required.

The operator utilized an independent test facility to evaluate the performance of the corrosion inhibitors with particular emphasis on weld corrosion. The inhibitors were tested on both C-Mn and 1% Ni weldments in a flow loop under varying degrees of shear stress.

Clariant Oil Services Solutions and Value Delivered

Clariant Oil Services conducted extensive laboratory work to formulate and evaluate environmentally-acceptable corrosion inhibitors specifically for this application. Clariant Oil Services’ CORRTREAT 7368 was selected as the best performing inhibitor and was proposed to the operator for further evaluation.

The results from the independent evaluation determined that CORRTREAT 7368 provided excellent inhibition toward general and localized corrosion, as well as exceptional protection against preferential weld attack at high shear stress up to 200 Pa. Hence CORRTREAT 7368 was selected for field deployment.

Clariant Oil Services has worked closely with the operator to ensure robust corrosion management performance measures are established. These include routine water analysis, corrosivity measurement together with corrosion coupon and probe analyses. These performance measures indicate that the corrosion rates in the system have reduced and the corrosion coupons do not exhibit evidence of pitting corrosion.

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