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.
Effects of CO2-Induced Reaction on Transport Properties of Debonded Well Cement-Casing Interfaces
Overview
Syllabus
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
Taught by
AGU
