CO<sub>2</sub> self-healing well is a reality in the North Sea | SLB

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

minus
North Sea, Norway, Europe, Offshore

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.

Graphic Isolation Scanner log of the SLB engineered CCS well.
An Isolation Scanner service log verified the double annular barrier was in the projected position
Products Used