Corrosion of 13Cr steel at the cement/casing interface in CO2/H2S environments at 4, 85 and 200 °C

Justin Beck, Ruishu Feng, Derek M. Hall, Aysel Buyuksagis, Serguei N. Lvov, Margaret Ziomek-Moroz

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

A study was carried out to investigate corrosion at the cement/casing interface for 13Cr casing steel. Cement simulated pore solution (CSPS) was developed by exposing cement pieces to 5% NaCl at 100 °C and 10 MPa in equilibrium with CO2. Pore solution was extracted from the cement pieces using a die press. Chemical analysis of the pore solution extract was performed and used for preparing CSPS for 13Cr corrosion testing. Corrosion tests were performed in CSPS at equilibrium with CO2 or CO2+H2S at 10 MPa at 4, 85, and 200 °C. Corrosion rates were determined using linear polarization resistance (LPR), electrochemical impedance spectroscopy (EIS), and mass loss coupons. Addition of H2S at 4 °C increased the corrosion rate, while at 85 °C it slightly decreased the corrosion rate. Only a small effect from H2S addition was observed at 200 °C. Cyclic voltammetry (CV) results showed passivation/depassivation of 13Cr in CSPS at 4 and 85 °C, while a transition to active corrosion was observed at 200 °C. Surface analysis using scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDS) found that both the coverage and complexity of the corrosion products formed increased dramatically with increasing temperature.

Original languageEnglish (US)
Title of host publicationCorrosion Conference and Expo 2018
PublisherNational Assoc. of Corrosion Engineers International
ISBN (Print)9781510864405
StatePublished - Jan 1 2018
EventCorrosion Conference and Expo 2018 - Phoenix, United States
Duration: Apr 15 2018Apr 19 2018

Publication series

NameNACE - International Corrosion Conference Series
Volume2018-April
ISSN (Print)0361-4409

Other

OtherCorrosion Conference and Expo 2018
CountryUnited States
CityPhoenix
Period4/15/184/19/18

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Chemical Engineering(all)
  • Materials Science(all)

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