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Experimental Investigation on the Corrosion Rate of L80-1Cr Steel in Seawater and Formation Water From a North Sea Offshore Field in CO2 Atmosphere

L80-1Cr is a common steel grade used in Oil & Gas applications as production tubing. This grade has been successfully employed in the industry for decades. However the used of injecting seawater (water flooding) as a mean of enhancing oil recovery significantly increases the risk of corrosion failure of the tubulars present in the well. When water is injected it will first displace the formation water already present in the reservoir which will enter in the production tubing together with the oil. With time the produced water chemistry will change from formation to seawater. Together with this other parameters like lower temperature and pH as a result of water flooding may have a significant impact on the corrosion resistance of tubing materials. Therefore the purpose of this investigation is to evaluate the effect of the seawater and formation water on the corrosion behavior of L80-1Cr in an oil production environment. The composition of the two waters and the testing condition replicates the real field situations experienced by operators in the Danish sector of the North Sea. The effect of Ca2+ and temperature are evaluated. Experiments were carried out at ambient pressure in a three-electrode cell setup. The atmosphere constituted of pure CO2 at three different temperatures namely: 40˚C 60˚C and 80. Linear Polarization and potentiodynamic sweeps were used to investigate the electrochemical behavior. The corrosion products and precipitates were analyzed using XRD SEM-EDS. Calcium carbonate together with amorphous iron carbonate was the main product found on the surfaces and it made the deposit more porous and brittle and therefore less protective.

Product Number: 51319-13061-SG
Author: Riccardo Rizzo
Publication Date: 2019
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