Bottom-of-Line (BOL) corrosion inhibitor design and production has been a successful story and a mature technology in oil and gas industry. However, preventing Top-of-Line (TOL) corrosion with inhibitors is very challenging, and even more challenging when pursuing dual functional corrosion inhibitors that serve for both BOL and TOL at the same time. Designing a dual functional corrosion inhibitor for both BOL and TOL is a difficult and challenging task, with several hurdles to overcome in this endeavor. Some of the difficult issues are: calculate the treating weight between the top of line and bottom of line, how to make the combined products perform effectively for both top and bottom of lines, how to make the low and high volatile molecules for mitigating BOL and TOL corrosion to be compatible and homogenous in a single blend.

More than 60 active components were used to develop more than 30 formulated products. These products were screened using a TOL rig, RCE and RCA methods to pare down the products. These were then subjected to various physical properties such as flash point, viscosity requirements, emulsion and foaming tendencies as well as thermal stability issues. Finally, two products were selected that satisfied all desired chemical characteristics and performance.

One BOL and TOL combined product denoted as TB-3 was developed for treating both BOL and TOL applications. TB-3 is a water-soluble product that exhibited excellent thermal stability up to 110°C and demonstrated high efficacy in corrosion inhibition for both BOL and TOL applications under sweet or sour conditions with or without the presence of organic acids.

Subject
Test methods, Water, Inhibitor performance, Corrosion rate, Pipelines, Vapors, Organic acids, Fluids, Corrosion inhibitors, Brines, Acetic acid, Corrosion protection, Corrosion coupons
Keywords:
Top-of-Line Corrosion, Bottom-of-Line Corrosion, dual functional corrosion inhibitor, corrosion inhibitor, sour gas corrosion, CO2 corrosion, organic acids
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2022
Association for Materials Protection and Performance (AMPP)
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