Premium connection downhole tubing corrosion

Shuanlu Lu, Jianmin Xiang, Yanjun Kang, Zeliang Chang, Xunchang Dong, Tongguang Zhai

Research output: Contribution to specialist publicationArticle

5 Scopus citations

Abstract

Macro- and micro-corrosion morphology analyses and material testing of corroded premium connection downhole tubing with couplings of 2 7/8-in by 6.4-lb/ft P110 tubing have been discussed. Corrosion was limited to the internal surface throughout the length of the coupling, and featured axial groove morphology. Corrosion perforation was observed at the field pin and it was also observed that corrosion from the field pin end to 28 mm away was most severe. Scanning electron microscopy of the corrosion perforation and pits on the internal surface of the tubing indicated corroded penetration, CO2 corrosion, and belt erosion-corrosion morphology. Micro-corrosion morphology and corrosion product analysis recognized that corrosion products were carbonate and chloride. The cause of the premium connection corrosion was the V form notch at the subsidiary shoulder, causing an abrupt geometric change and leading to fluid turbulence and erosion-corrosion.

Original languageEnglish
Pages66-69
Number of pages4
Volume47
No5
Specialist publicationMaterials Performance
StatePublished - May 2008

ASJC Scopus subject areas

  • General Materials Science
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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