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Tuesday, June 18, 2019

Microbial corrosion of coal seam gas wells

In March 2019 EIN Presswire published an article on corrosion in Queensland's coal seam gas wells...

It had been at this link

Corrosion in coal seam gas wells seems systemic in Queensland

The now-deleted article included -

Xpandable Patches to extend the life of corroded CSG wells in Queensland, Australia

Charles Albouy,

  • Full-covered Xpandable Patches successfully isolated bacterial corrosion in coal seam gas wells;
  • Microbiologically-influenced corrosion seems to be systemic in the region, and other operators might encounter similar issues in their CSG wells.

Saltel Industries was approached in 2016 by one of Australia’s leading natural gas producers, to tailor a solution for their unusual problem: in some of their CSG wells in Queensland, the 7in production casing must cope with severe and localized external corrosion, developing at shallow depth. These corrosion cases are suspected to be caused by bacteria growing under specific pressure and temperature environments. ...

The corrosion damage can occur at very shallow depths (e.g., as little as a few metres below the wellhead), and corrosion damage can leave less than 80% of the casing metal thickness. In this situation, traditional patch setting methods that require high-pulling or explosive alternatives are complicated and risky for the casing and involve serious HSE downhole hazards. ...