Chapter 32 CO2 Storage in Coalbeds Risk Assessment of CO2 and Methane Leakage Chapter uri icon

abstract

  • Publisher Summary This chapter focuses on assessing potential leakage pathways and introduces a probabilistic risk assessment methodology. An investigation is performed to evaluate geomechanical factors that need to be taken into account in assessing the risk of CO2 leakage in CO2 storage in coalbeds. The result shows that geomechanical processes lead to risks of developing leakage paths for CO2 at each step in the process of CO2 storage in coalbeds. Risk of leakage is higher for old wells that are converted to injectors. Risks of leakage are much higher for open cavity completions than for cased well completions. The processes of depressurization during dewatering and methane production, followed by repressurization during CO2 injection, lead to risks of leakage path formation by failure of the coal and slip on discontinuities fin the coal and overburden. The most likely mechanism for leakage path formation is slip on pre-existing discontinuities that cut across the coal seam. A mathematical model for probabilistic risk assessment is introduced. The model consists of six functional constituentsinitiators, processes, failure modes, consequences (effects), indicators, and inference queries.

author list (cited authors)

  • Wo, S., Liang, J., & Myer, L. R.

citation count

  • 4

complete list of authors

  • Wo, Shaochang||Liang, Jenn-Tai||Myer, Larry R

Book Title

  • Carbon Dioxide Capture for Storage in Deep Geologic Formations

publication date

  • January 2005