Effective geologic sequestration of CO2 requires long-term storage with very low leak rates. Injection wells are an obvious leakage pathway for CO2 because they perforate the confining caprock. In addition, sequestration sites are likely to use monitoring wells to assess performance and, in the case of depleted oil and gas fields, may contain 10s to 1000s of older operating and abandoned wells.

All wells may have leakage pathways due to faulty construction or other defects. However, it is the subject of this chapter to consider whether geochemical reactions induced by CO2 could result in damage to wells...

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