Field studies for de-risking existing wells and CCS site geology

Primary objective of the LEGACY project is to develop tools and technologies for screening, modelling, monitoring, and mitigation of well integrity issues and leakage, thereby enabling safe and cost-efficient, large-scale storage of CO2 in areas with legacy wells. Scientific aims:

  • Communicate effectively with industry, state regulators and general public on legacy wells threats and
  • opportunities,
  • Develop an automated workflow for screening of legacy wells,
  • Demonstrate tools for cost-efficient non-invasive monitoring of well integrity and leakage,
  • Develop and validate strategies for efficient modelling and prediction of leakage rates,
  • Develop strategies for mitigation/remediation of well integrity issues,
  • Explore the possibility of using legacy wells to improve monitoring of storage sites,
  • Develop recommendations for future well construction and abandonment to facilitate monitoring,

CCS is world-wide considered a key measure to keep global warming to 1.5 degrees. CATF reports that by 2030, available CO2 storage capacity will amount to around half the volume of captured CO2. As more storage space is needed, more complex areas need to be considered. For CCS in historical oil and gas regions, containment of CO2 could be jeopardized by leakage along legacy well paths. Without storage in those regions, with well-known and extremely well-suited geological features in addition to potentially reusable infrastructure, world-wide storage capacity would be significantly limited.