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Evaluation of Performance of an Amine Based and an Imidazoline Based Gas Condensate Inhibitor Tested with a High Velocity Laboratory Test Rig

Vergleich der Inhibitorschutzwirkung eines amin- und eines imidazolin- basierenden Korrosionsinhibitors in einer Laborprüfanlage unter hohen Strömungsgeschwindigkeiten

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Abstract

An amine based CO2 corrosion inhibitor and an imidazoline based CO2 corrosion inhibitor have been tested in a two-phase laboratory flow loop system under conditions of a gas condensate well in Austria. After a detailed description of the experimental setups, degradation rates of material API L-80 (UNS G41300) as function of flow velocity and inhibitor dosage are presented. Further, the influence of chloride addition on inhibitor performance has been investigated. All results are discussed with respect to critical inhibitor concentration to reach nearly 100 % inhibitor efficiency.

Inhibitor A exhibits alkylamine as an active ingredient dissolved in ethylene glycol and different alcohols, and the effect of inhibitor B is based on imidazoline dissolved in different alcohols. Results demonstrate that the test rig delivers reasonable results with respect to inhibitor protection rates. Independent of superficial flow velocities (tested between 3 and 35 m/s), both inhibitors exhibit a good performance as long as dosed above their critical concentration. The critical concentration is clearly below 100 ppm to the liquid phase. The addition of chlorides affects the performance of the alkylamine based inhibitor significantly more than in case of the imidazoline.

Zusammenfassung

Ein Amin-basierenender CO2-Korrosionsinhibitor und ein Imidazolin-basierender CO2-Korrosionsinhibitor wurden in einem Zweiphasen-Laborprüfsystem unter Bedingungen getestet, die einer österreichischen Gassonde entsprechen. Nach einer ausführlichen Beschreibung der Versuchsanordnung werden die Abtragsraten eines API L-80 (UNS G41300) Stahles in Abhängigkeit von Strömungsgeschwindigkeit und Inhibitordosierung gezeigt. Zusätzlich wurde der Einfluss von Chloriden auf die Inhibitorschutzwirkung untersucht. Inhibitor A enthält als Wirkstoff Alkylamin gelöst in Ethylenglykol und verschiedenene weitere Alkohole. Die Wirkung von Inhibitors B basiert auf Imidazolin als primäre Wirkkomponente. Die Ergebnisse zeigen, dass der Prüfstand mit der Praxis vergleichbare Ergebnisse hinsichtlich der Dosierung von Inhibitoren liefert. Unabhängig von der Strömungsgeschwindigkeit (getestet zwischen 3 und 35 m/s) zeigen beide Inhibitoren eine gute Schutzwirkung, so lange sie über ihrer kritischen Konzentration dosiert sind. Die kritische Konzentration liegt bei beiden deutlich unter 100 ppm. Die Zugabe von Chloriden beeinflusst die Wirkung des Amin-basierenden Inhibitors deutlich mehr als die des Imidazolin-basierenden Inhibitors.

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Authors and Affiliations

  1. Institute for General and Analytical Chemistry, Montanuniversität Leoben, Franz-Josef-Str. 18, 8700, Leoben, Austria

    A. Prethaler & G. Mori

  2. Institute for Chemical Technologies and Analytics, Technical University of Vienna, Getreidemarkt 9, 1060, Vienna, Austria

    E. Rosenberg

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  1. A. Prethaler
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  2. G. Mori
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  3. E. Rosenberg
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Correspondence to A. Prethaler.

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Prethaler, A., Mori, G. & Rosenberg, E. Evaluation of Performance of an Amine Based and an Imidazoline Based Gas Condensate Inhibitor Tested with a High Velocity Laboratory Test Rig. Berg Huettenmaenn Monatsh 160, 346–351 (2015). https://doi.org/10.1007/s00501-015-0387-9

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