Development of High Shear Corrosion Inhibitor for Mild Steel in Different CO2 and CO2/H2S Environments With and Without Sand

Increasingly wells are produced at high velocities with sand production. If this occurs, one option is to build the well with materials that are not affected by erosion and corrosion at high shear stresses. The development of high shear corrosion inhibitors allow operators to use cheaper materials of construction while having high oil production rates. In this paper, the development and field trial results of a new high shear corrosion inhibitor that works in CO₂ and CO₂/H₂S environments are described. The corrosion inhibitor has performed well in tests with sand in a CO₂ environment. Tests will be described that demonstrate the corrosion inhibitive properties of this new product and its compatibility with different metals and elastomers. This is important to ensure that the corrosion inhibitor works in environments where it will be difficult to retrieve equipment. The product is suitable with umbilical injection and can be used in deepwater applications. This allows it to be deployed in systems where the subsea well can be over 1.5 miles below the ocean.  It also exhibits better water quality attributes than other high shear corrosion inhibitors that work in a CO₂ environment in the presence of sand.  The product has worked in several locations ranging from deepwater to on-shore applications.  The results of several field trials where this new corrosion inhibitor was tested will be discussed in this paper. The product has been successfully used in these applications and has allowed operators to use equipment with cheaper materials at high production rates without loss of asset integrity.