Tailor-made Corrosion Inhibition Treatment of Low-Pressure Sour Gas Wells

Abstract Batch corrosion inhibitor treatment has been successfully applied for controlling both corrosion and iron sulfide deposition in one high-temperature sour gas field. However, there are several challenges on using this treatment method for low-pressure wells. In this work, the gas wells are modeled to identify gas velocities in which liquid loading might occur. Different chemicals that can change flow regime from slug flow regime to annular flow regime are investigated. A foam column test was used to evaluate the ability of a mixture of foamers and corrosion inhibitor to unload mixtures of hydrocarbons and brines at different water cut level and brine salinity. Corrosion testing was also conducted in a rotating cage apparatus to mimic real-life well conditions. Test results indicated that there is no major adverse effect of the foamers on sour corrosion inhibitor performance. The dual-functional chemical treatment adds value to the production sustainability while minimizing well operative and integrity problems.