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51315-5759-Corrosivity and Corrosion Inhibition of Wet-Sour Crude Oil Wells

Picture for Corrosivity and Corrosion Inhibition of Wet-Sour Crude Oil Wells
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Product Number: 51315-5759-SG
ISBN: 5759 2015 CP
Author: Yahya Al-Janabi
Publication Date: 2015
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This paper presents the results of a study conducted to investigate the corrosivity of wet-sour crude oil wells and to examine the performance of several potential chemical inhibitors. Recently wet-sour crude oil wells have been experiencing increased incidents of localized corrosion as was indicated by the escalating number of tubing-casing-annulus (TCA) communications. Previously under these environments protection of downhole equipment was attributed to the formation of passive iron sulfide films/layers. In this work we studied the natural inhibition of two crude oil samples and the effect of different levels of synthetic and live brines. For corrosion inhibition we evaluated the performance of several commercially available chemicals in terms of partitioning demulsification thermal stability as well as their inhibition efficiency under continuous and batch treatments scenarios.Ranking the performance of candidate chemical inhibitors was based on the following criteria: a) the chemical must show high corrosion inhibition efficiency in both brine and brine/crude oil mixtures with more emphasis on the latter case; b) high thermal stability or increase in thermal stability due to heating; c) sufficient partitioning into the aqueous phase; and d) minimum demulsification effect which will ensure corrosion inhibitor availability to protect downstream carbon steel facilities. Based on the lab results initial rankings for continuous and batch treatments were determined. Considering the corrosion inhibitors performance and ranking under each criteria mentioned above an overall ranking for both continuous and batch treatments was obtained and was proposed for field test-trials.
This paper presents the results of a study conducted to investigate the corrosivity of wet-sour crude oil wells and to examine the performance of several potential chemical inhibitors. Recently wet-sour crude oil wells have been experiencing increased incidents of localized corrosion as was indicated by the escalating number of tubing-casing-annulus (TCA) communications. Previously under these environments protection of downhole equipment was attributed to the formation of passive iron sulfide films/layers. In this work we studied the natural inhibition of two crude oil samples and the effect of different levels of synthetic and live brines. For corrosion inhibition we evaluated the performance of several commercially available chemicals in terms of partitioning demulsification thermal stability as well as their inhibition efficiency under continuous and batch treatments scenarios.Ranking the performance of candidate chemical inhibitors was based on the following criteria: a) the chemical must show high corrosion inhibition efficiency in both brine and brine/crude oil mixtures with more emphasis on the latter case; b) high thermal stability or increase in thermal stability due to heating; c) sufficient partitioning into the aqueous phase; and d) minimum demulsification effect which will ensure corrosion inhibitor availability to protect downstream carbon steel facilities. Based on the lab results initial rankings for continuous and batch treatments were determined. Considering the corrosion inhibitors performance and ranking under each criteria mentioned above an overall ranking for both continuous and batch treatments was obtained and was proposed for field test-trials.
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