Development of New High Temperature Scale and Corrosion Inhibitor Combination Product for Capillary Injection

Abstract The development of combination products for scale and corrosion inhibition for wells producing at high downhole temperatures (~150°C) and that generate produced waters with high calcium concentrations can be a challenging undertaking. Traditional phosphonate scale inhibitors can be very effective; however, they have been shown to form insoluble precipitate, “pseudo scale”, at high calcium concentrations that can plug and fail capillary strings. The development in this work considered the use of polymeric type scale inhibitor and a new high temperature corrosion inhibitor. Additionally, the evaluation of the corrosion performance is challenging due to the difficulties derived from attempting to prevent the scaling process while trying to obtain meaningful corrosion performance data. The developed combination product was stable at 150°C, compatible with capillary string materials, and outperformed an incumbent product based on a phosphonate scale inhibitor and a traditional corrosion inhibitor.