Effects of CO2-Induced Reaction on Transport Properties of Debonded Well Cement-Casing Interfaces

Explore a 22-minute conference talk from the 2014 AGU Fall Meeting that delves into the effects of CO₂-induced reactions on transport properties of debonded well cement-casing interfaces. Learn about reactive flow-through experiments conducted on a metre scale, examining potential CO₂ leakage paths in wells. Discover key findings on apparent sample permeability, microstructural observations, and evidence for sealing mechanisms. Gain insights into upstream dissolution and downstream precipitation as a long-range defect sealing mechanism. Understand the implications for carbon storage and well integrity in the context of coupled hydraulic, geochemical, and geomechanical processes.

Intro
Wells provide potential Co, leakage paths
Reaction and transport in debonded cement-casing interfaces
Approach: reactive flow-through experiments
Results: apparent sample permeability
Results: microstructural observations
Results: XRF single-element maps (Coil B)
Results: SEM evidence for sealing (Coil A)
Results: thermo-gravimetric analysis (A+B)
Upstream dissolution + downstream precipitation a long-range defect sealing mechanism
Conclusions