Mitigation and remediation technologies and practices in case of undesired migration of CO2 from a geological storage unit—Current status

Risk management in carbon capture and geological storage: insights from a structured expert elicitation

“…With the emphasis on monitoring as one of the preferred RM options, effective mitigation responses are also required should an adverse circumstance be identified. Guénan et al (2011) created a database of mitigation measures for risk events and Manceau et al (2014) provide a review of mitigation and remediation technologies and practices for the case of undesired CO 2 migration in a storage unit. Farhat and Benson (2015) proposed a methodological framework that aims to link risk assessment to corrective measures, using a collaborative and transparent contingency planning process; this could have potential application to LPHI events.…”

Methodology to optimize the sizing of a corrective measure in case of leakage from a CO2 geological storage unit

“…-C: Stop the injection (this alternative is called "natural attenuation" in the following; note that the meaning of the term "natural attenuation" corresponds to "monitored natural attenuation" as recalled in Manceau et al, 2014); -D: Transform the injection well into a production well to extract fluids from the reservoir (including CO 2 ); -E1: Drill a new well just above the leakage zone, and extract fluids from the top aquifer; -E2: Drill a new well just above the leakage zone, and extract fluids from the reservoir; -G: Drill a new well just above the leakage zone, and inject fluids in the top aquifer to create an hydraulic barrier; -F: Assuming that an existing well can be transformed and re-used at mid-distance between the well and the leakage, extract fluids from the reservoir (including CO 2 ).…”

“…The present paper addresses the risk of undesired CO 2 migration from a geological storage unit, through a semi-pervious caprock, a fault, a fractured zone or any other leakage pathway which would be difficult to remediate. A literature review on CM to handle such irregularities has been proposed in Manceau et al (2014). The CM considered in our work are mostly restricted to fluid and pressure management techniques.…”

Identification of potential CO2 leakage pathways and mechanisms in oil reservoirs using fault tree analysis

“…The CO 2 monitoring and control technologies have been paid increasing attentions during the CO 2 storage demonstration projects in order to accurately and timely master the condition of CO 2 stored in geological structures 14,31 . Different monitoring technologies are used, 32,33 such as 4D seismic, microseismic, cross‐well, electrical resistivity tomography, electric spontaneous potential, well fluid sampling, gas tracers, carbon isotope, ground water sampling, soil gas sampling, and air sampling, which can be classified into two different methods according to their monitoring subjects: reservoir monitoring methods and near‐surface monitoring methods.…”