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Calcite Formation and Inhibition Under CO2 Corrosion Environment

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Metal-carbonate scales are a double-edged sword for upstream oil and gas production engineering. On one hand, many of these scales can lead to serious setbacks if untreated, such as production interruption. One common example is calcite scale deposition on production tubing.

Product Number: 51323-19227-SG
Author: Wei Li, Xin Wang, Yuqing Ye, Amy Kan, Mason Tomson
Publication Date: 2023
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Carbonate scales (e.g., calcite, CaCO3) and corrosion-induced scales of mild steel (e.g., siderite, FeCO3) in sweet (CO2 containing) conditions are both frequently encountered during oil and gas production. However, the interactions of steel corrosion and mineral carbonate scale formation remain unclear. In this study, a once-through flow cell apparatus was utilized to concurrently study mild steel tubing corrosion and scaling behaviors in a simulated produced water environment. The study shows that a two-layer scale structure forms on the mild steel surface. The inner layer is a carbonate solid solution, i.e., ankerite, Ca(FexMg1-x)(CO3)2. Transition toward a calcite-dominated outer layer was observed. In addition, the impacts of the corrosion-scaling interactions on conventional scale inhibition and corrosion inhibition methods are investigated.

Carbonate scales (e.g., calcite, CaCO3) and corrosion-induced scales of mild steel (e.g., siderite, FeCO3) in sweet (CO2 containing) conditions are both frequently encountered during oil and gas production. However, the interactions of steel corrosion and mineral carbonate scale formation remain unclear. In this study, a once-through flow cell apparatus was utilized to concurrently study mild steel tubing corrosion and scaling behaviors in a simulated produced water environment. The study shows that a two-layer scale structure forms on the mild steel surface. The inner layer is a carbonate solid solution, i.e., ankerite, Ca(FexMg1-x)(CO3)2. Transition toward a calcite-dominated outer layer was observed. In addition, the impacts of the corrosion-scaling interactions on conventional scale inhibition and corrosion inhibition methods are investigated.

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