Presenter: Nils Opedal, SINTEF
This is a critical parameter needed for models for planning well construction and abandonment, as cement is used as barrier between the well and the surrounding subsurface formations. In the work detailed here, we looked at the effect of exposure to different mixtures of CO2 and brine on the cement bond strength.
This interface is already the weakest link in well integrity; for CO2 injection wells, as well as for plugged legacy oil and gas wells, it is thus of the utmost importance to quantify any additional weakening as a result of exposure to CO2. This exposure could occur near the well or inside it in case of an unwanted leakage event (also known as sustained casing pressure, if occurring inside the well).