EverCRETE CO2-Resistant Cement System

Overview Library

Ensuring Long-Term Well Integrity

When CO2 is stored underground, it has the potential to become highly corrosive to existing oilfield cements, compromising the integrity of the well. Such damage to the cement sheath would allow CO2 to leak out of the reservoir and return to the atmosphere, leading to economic loss and reduction of CO2 injection/storage efficiency.

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

Based on existing CemCRETE concrete-based oilwell cementing technology, EverCRETE CO2-resistant cement has proven highly resistant to CO2 attack in the most extreme laboratory conditions, including environments with wet supercritical CO2 and CO2 water saturation under downhole conditions. The EverCRETE 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. EverCRETE cement can also be used to plug and abandon existing wells drilled through the storage zone to reestablish long-term well integrity.

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Compressive Strength Over Time

Compressive strength over time of co2 resistent cement and portland cement.
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