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Operators are experiencing severe pitting corrosion on horizontal casing in the Eagle Ford region. Using aqueous modeling, it is possible to simulate the corrosion that would occur in the presence of those species.
Operators are experiencing severe pitting corrosion on horizontal casing in the Eagle Ford region. The most severe pitting was estimates and ~240 mpy (~6.60 mm/yr) based on linear extrapolation. For the well of interest the toe sleeve was opened and perforated to perform a small acid fracturing job. The well was then filled with 1% KCI containing biocide. The process leaves the well open to the reservoir but in non-flowing condition. Five months after initial completions work, corrosion was observed when completions were resumed. Two limited inspections were performed showing pitting near the middle of the horizontal section with no corrosion closer to the vertical section. The question was to determine the if the damage in the horizontal section could be due to fluid in the well (1% wt. KCI) mixing with formation fluids (containing 1mol% CO2 and formation brine which included high amounts of acetic and propionic acids). Using aqueous modeling, it is possible to simulate the corrosion that would occur in the presence of those species.
Key Words: well horizontal, CO2 corrosion, organic acids, aqueous modeling,
This paper provides an overview of the existing literature with regards to the understanding of cracking in molybdenum-containing 13Cr alloys and provides suggested paths of investigation.
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Sodium bisulfite oxygen scavenger is being applied in some sea water flood injection systems in the Gulf of Mexico. High corrosion rates were observed in one field during periods when oxygen scavenger injection rates were elevated.
A sour gas plant was experiencing high corrosion and fouling in aggressive conditions (170 to 195°F, 170 psi pH2S, 280 psi pCO2) including the presence of elemental sulfur (0.1 wt%). The current chemical program appeared to be ineffective.