The Development of Sulfur Solvent/Corrosion Inhibitor Product for Extremely Aggressive Sour Environm

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Product Number: 51316-7783-SG

ISBN: 7783 2016 CP

Author: Haitao Fang

Publication Date: 2016

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There are aggressive wells in Canada Germany and the Middle East that have high temperature high H2S and CO2 content and which produce several tons of elemental sulfur each day. These wells must be produced with co-injection of sulfur solvents to prevent the plugging of the well bore. As one might expect these wells can also be highly corrosive and chemical products must also include corrosion inhibitors to extend the lifespan of the wells and also to allow use of carbon steel instead of corrosion resistant alloys (CRAs). Forcing the use of CRA can often kill a project therefore qualification of sulfur solvents with corrosion resistant properties is key to mitigate the risk of these assets and make them economically viable. The qualification process can be challenging since laboratory testing under conditions this harsh requires addition of liquid H2S and liquid CO2 to the autoclaves at room temperature. This process requires equation-of-state calculations to model the contents of the autoclave at room temperature to achieve at-temperature conditions.This paper addresses one such qualification where the field conditions were predicted to be extremely sour with 35% of H2S 9.5% of CO2 and a total pressure of 3400 psi at bottom hole. Temperatures were expected to exceed 300°F. The wells are also expected to produce significant amounts of elemental sulfur (>100 lb/MMScf). A combination sulfur solvent with corrosion inhibitor product was developed specifically for this sour gas field. The sulfur uptake boiling point emulsion tendency and the corrosion inhibition performance of the new product were evaluated in the laboratory. According to the laboratory test results the product developed showed high sulfur uptake and good corrosion inhibition performance under both well head and bottom hole conditions.