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Multipronged Characterization of Scales and Corrosion on L80 Steel in the Presence of Microorganism

Scale deposition is one of the most important and serious problems which can limit or block oil and gas production. Scale deposit and corrosion attack on the L80 steel removed from the oil fields were observed using several analytical techniques including 3D scanning microscopy scanning electron microscopy (SEM) energy dispersive spectroscopy (EDS) transmission electron microscopy (TEM) and X-ray diffraction (XRD). This multipronged approach provided a detailed image of scale-chronology and content of the scale in terms of phase composition and chemistry. Cross-sectional SEM examinations showed scale-chronology showing various phases at depending on the chemistry and other parameters in the well at different times. The TEM and XRD studies gave information about the amorphous and/or nanocrystalline nature of some of the formed corrosion products. The XRD and SEMresults revealed the formation of iron hydroxides iron sulfide iron chloride on the steel surface in the biotic system. Strontium sulfate barium sulfate and calcium carbonate were deposited on the corrosion products. Morphology differences between microbial corrosion pits and non-microbial corrosion pits were studied. The investigation shows that the steel surface has been significantly corroded by pitting corrosion microbial corrosion flow corrosion etc. . The SEM results showing pitting corrosion of the steel surface under the comprehensive action of the metabolism of microorganism. Pits caused by the microbial action showed many tiny pores crammed together when observed at high magnification. The research results have good reference value and guiding significance for the establishment of scale model and the selection of corrosion protection methods.

Product Number: 51319-13226-SG
Author: Riccardo Rizzo
Publication Date: 2019
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