Self-healing cement well built for CO₂ storage in the North Sea

A major international operator made carbon capture and sequestration (CCS) a reality with the first offshore implementation of the EverCRETE™ CO₂-resistant cement system for a site on the Norwegian Continental Shelf (NCS). The EverCRETE system was engineered by SLB for its durability against CO₂ degradation. The system is self-healing upon contact with CO₂. Any microcracks that appear during the life of the well are engineered to close and seal themselves.

Long-term CO₂ storage requires a secure, CO₂-resistant containment design that will last decades. Conventional portland cement is subject to chemical degradation by CO₂ that attacks the cement matrix. SLB recommended the EverCRETE system for its durability against CO₂ damage with a self-healing process that seals microcracks.

The drilling and cementing project achieved all the zonal isolation requirements for a future CO₂ injector well with the EverCRETE system. Its design is a special blend that is resistant to corrosive CO₂ degradation. The EverCRETE system is fit for purpose using operator-provided life-of-well simulations. The cementing operations were executed as planned. Next, a circumferential verification of the annular cement was performed using an Isolation Scanner™ cement evaluation service. This logging operation confirmed the presence of double annular barriers inside the caprock above the reservoir, meeting the zonal isolation requirements of the NORSOK D-010 (2021) standard.