Abstract
A lack of data and models for corrosion and scale at the extreme temperatures and pressures (xHTHP) encountered in ultra deepwater reservoirs increases the economic and safety risks of offshore production. Corrosion resistant alloys (CRAs) are commonly used for ultra deepwater oil and gas production. Those CRAs are usually good to resist uniform corrosion, however, localized corrosion (e.g. pitting) is always a concern for these applications.
The present work is aimed at evaluating the pitting corrosion tendency of different deepwater operation tubing materials at realistic ultra deepwater temperature (up to 250 0C) and CO2 partial pressure (up to 100 psig) in a static autoclave reactor under different salinity conditions. Electrochemical technique cyclic polarization was used to evaluate the potential of pitting corrosion of different alloys. A methodology to apply vertical scanning interferometer (VSI) to assess the severity of localized corrosion was developed as well.
Key words: corrosion resistant alloys, cyclic polarization, high temperature, pitting, ultra deepwater, CO2 corrosion.
