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Corrosion Inhibition Of Carbon Steel In Carbonate Acidizing At Elevated Temperature

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A suitable acid package in matrix acidizing application is very important to the stimulation employed to improve the productivity of carbonate reservoirs. Typically, concentrated acids between 5 and 28 wt% are used and the most used mineral acid for carbonate acidizing treatment is hydrochloric acid (HCl) 1,2. A significant challenge of acidizing treatment is corrosion loss of metal tubulars due to the high reactivity of acid and metal, especially at high temperatures. Corrosion inhibitors are needed to reduce the corrosion loss of steel surface of facilities exposed in acidic environment.

Product Number: 51322-17562-SG
Author: Limin Xu, Tao Chen, Ming Han, Mohammed Bataweel
Publication Date: 2022
Industries: Cathodic Protection , Corrosion Monitoring and Control , Coatings
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This paper presents an investigation on the performance of corrosion inhibitors in reducing corrosion loss of N80 steel coupons at high temperature in 15 wt.% and 28 wt.% HCl solutions. This work studied the effect of temperature and acid concentration on corrosion inhibitor performance and provided an efficient corrosion inhibitor for application at elevated temperature of 120°C. Five corrosion inhibitors including Mannich base derivatives and pyridine quaternary ammonium salt were selected. The corrosion rates of N80 steel in concentrated HCl solution with and without corrosion inhibitor were evaluated by gravimetric method and the surface of steels after corrosion tests were characterized by microscopy. The results showed that the corrosion rate of N80 steel in 15 wt.% HCl at 120°C was much higher than that at 90°C. As a result, higher concentration of corrosion inhibitor was needed to reduce the corrosion to an acceptable value of 0.05 lb/ft2. The corrosion rate could be reduced to 0.0035 lb/ft2 in 15 wt.% HCl at 120°C. Increasing the HCl concentration to 28 wt.% at 120°C, the corrosion inhibitor concentration required was several times as much as the dosage for 15 wt.% HCl.

This paper presents an investigation on the performance of corrosion inhibitors in reducing corrosion loss of N80 steel coupons at high temperature in 15 wt.% and 28 wt.% HCl solutions. This work studied the effect of temperature and acid concentration on corrosion inhibitor performance and provided an efficient corrosion inhibitor for application at elevated temperature of 120°C. Five corrosion inhibitors including Mannich base derivatives and pyridine quaternary ammonium salt were selected. The corrosion rates of N80 steel in concentrated HCl solution with and without corrosion inhibitor were evaluated by gravimetric method and the surface of steels after corrosion tests were characterized by microscopy. The results showed that the corrosion rate of N80 steel in 15 wt.% HCl at 120°C was much higher than that at 90°C. As a result, higher concentration of corrosion inhibitor was needed to reduce the corrosion to an acceptable value of 0.05 lb/ft2. The corrosion rate could be reduced to 0.0035 lb/ft2 in 15 wt.% HCl at 120°C. Increasing the HCl concentration to 28 wt.% at 120°C, the corrosion inhibitor concentration required was several times as much as the dosage for 15 wt.% HCl.

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Corrosion Inhibitors Use: Case Study For Guinea Gulf Assets Application

Product Number: 51322-17663-SG
Author: Alvaro Mpaka Sousa, Laurent Dehays, Francisco Mateus Garcia, Mioara Stroe, Raquel Eduarda Araujo
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Carbon steel (CS) material is widely used for the equipment in oil and gas production industry due to its mechanical properties associated with a relatively low cost, compared to other materials. Depending on the corrosiveness of the fluid that is vehiculated, the use of carbon steel is generally associated with the injection of a corrosion inhibitor (CI) in order to mitigate internal corrosion. Corrosion inhibitors are generally used in continuous injection at an injection rate that is depending on the corrosiveness of the fluid. Based on the operational feedback, the internal standards are recommending for multiphase pipelines CI injection rates in the range of 50 - 70 ppm for temperature below 80°C of and of 150 to 200ppm for temperatures above 100°C. These injection dosages are typical values that are considered in the laboratory tests for the qualification of the CI and they are adjusted on-site based on the monitoring results.
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Corrosion Inhibitor Encapsulation For Enhanced Chemical Efficiency And Performance

Product Number: 51322-17548-SG
Author: Fang Cao, James Oxley, Yao Xiong, Satish Bodige, Dennis Schmatz
Publication Date: 2022
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Corrosion of pipelines made of carbon steel and exposed to wet hydrocarbons containing CO2 and H2S is a common but serious problem encountered in petroleum industry and its occurrence causes enormousexpense due to production downtime, accidental injuries, and replacement costs. Control and prevent corrosion using chemical treatment (e.g. corrosion inhibitor injection) is one of the most cost-effective solutions and commonly practiced methods to prevent corrosion failures in pipelines in oil and gas industry. Generally speaking, the active corrosion inhibitor (CI) components in commercial CI packages are usually organic, nitrogen-based surfactants such as amines, imidazoline and its derivatives. Due to the amphiphilic nature of surfactants, a good fraction of the injected CI will inevitably go into the oil phase through partitioning and to the oil/water interface.
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Corrosion Inhibitor Surfactant Optimization: Part 1 - Inhibitor Efficiency Approach

Product Number: 51322-18043-SG
Author: Richard C. Woollam, Yasmin Hayatgheib, Joshua Owen, Richard Barker
Publication Date: 2022
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Corrosion inhibitors provide a critical barrier to internal corrosion, presenting the most cost-effective form of mitigation and enabling operators to use carbon steel where it would otherwise be impractical. The correct selection and validation of inhibitors is essential to ensure successful field deployment, providing safe and reliable operation. However, the selection and optimization of a corrosion inhibitor for a particular field application is not trivial.  
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