EverCRETE CO2-Resistant Cement System | Schlumberger

EverCRETE

CO2-resistant cement system

Longer-lasting zonal isolation
In CO2 underground storage environment
Only standard equipment required
For mixing and pumping

Ensuring long-term well integrity

When stored underground, carbon dioxide can become highly corrosive to existing oilfield cements, compromising well integrity. Such damage to the cement sheath would allow CO2 to leak out of the reservoir and into the atmosphere, leading to economic loss and reduced injection and storage efficiency.

Our latest wellbore isolation technology for carbon dioxide geological storage, the EverCRETE system —provides an enduring solution for zonal isolation during injection, storage, monitoring, and after abandonment. This technology can be applied for carbon capture and storage as well as CO2 enhanced oil recovery (EOR) projects.

Based on existing CemCRETE concrete-based oilwell cementing technology, EverCRETE CO2-resistant cement system has proved highly resistant to CO2 attack in the most extreme laboratory conditions, including environments with wet supercritical CO2 and CO2 water saturation in downhole conditions. The system reduces the risk of CO2-induced degradation of the cement sheath that could lead to leakage. It can be incorporated into standard primary cementing operations for zonal isolation of new CO2 injection wells. The system can also be used to plug and abandon existing wells drilled through the storage zone to reestablish long-term well integrity.

Cement cores are tested in supercritical CO2 that is saturated with water and water-saturated CO2 under downhole temperature and pressure conditions.
Cement cores tested in a CO2 durability test reactor are simultaneous subjected to supercritical CO2 that is saturated with water (red) and water saturated with CO2 (blue) under downhole temperature and pressure conditions.
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