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This paper studies the effect of oxygen in methanol on the structures and growth kinetics of iron sulfide scales. Gravimetric weight analysis was used to evaluate the corrosion mechanisms and rates. Scanning Electron Microscope/ Energy Dispersive X-ray Spectrometry (SEM/EDX), Optical Microscope and X-ray Diffraction (XRD) were used to analyze the scale.
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Case histories are presented where Oxygen ingress has led to Sulfur corrosion failures in pipelines and downhole equipment.
This paper presents an expanded laboratory test database on critical corrosion modes for UNS R55400 pipe exposed to relevant oilfield production environments which include sour well fluid brines, a heavy chloride/bromide brine well completion fluid, injected methanol, organic acid- and HCl-based well acidizing solutions, and seawater.
Susceptibility of Grades 23 and 29 titanium Tapered Stress Joint (TSJ) forgings to gas phase methanolic Stress Corrosion Cracking (SCC) was measured in deaerated, dry 0-0.5 wt.% and saturated methanol-containing methane gas environments at 25C in a two phase laboratory program.
In this work, sour TLC was systematically studied in autoclaves with a special holder that exposed one side of the TLC coupon while the back side was exposed to cooling liquid.
In this work, a specially made sample holder that can be fitted inside regular autoclaves was used for simulating sour TLC in the presence of methanol. The experiments showed that for 10 bar H2S + 10 bar CO2, the TLC mass loss rate was 0.2-0.3 mm/y of general corrosion without localized attacks.