Dissolved CO2 Injection to Eliminate the Risk of CO2 Leakage in Geologic Carbon Storage

摘要：

　　Geologic carbon storage is usually viewed as injecting,or rather as storing,CO2 in supercritical phase.This view is very demanding on the caprock,which must display:(1)high entry pressure to prevent an upward escape of CO2 due to density effects;(2)low permeability to minimize the upwards displacement of the brine induced by the injected CO2; and(3)high strength to ensure that the fluid pressure buildup does not lead to caprock failure.We analyze the possibility of injecting dissolved CO2 and,possibly,other soluble gases for cases when the above requirements are not met.The approach consists of extracting saline water from one portion of the aquifer,reinjecting it in another portion of the aquifer and dissolving CO2 downhole.Mixing at depth reduces the pressure required for brine and CO2 injection at the surface.We find that dissolved CO2 injection is feasible and eliminates the risk of CO2 leakage because brine with dissolved CO2 is denser than brine without dissolved CO2 and thus,it sinks towards the bottom of the saline aquifer.

关键词： CO2 storage Dissolved CO2 Leakage Caprock Buoyancy

作者: Victor Vilarrasa Maria Poo Silvia De Simone Jesus Carrera

作者单位: Institute of Environmental Assessment and Water Research,Spanish National Research Council(IDAEA-CSI Institute of Environmental Assessment and Water Research,Spanish National Research Council(IDAEA-CSI

会议类型: 国际会议

会议名称: The 8th International Congress on Environmental Geotechnics(第八届国际环境土工大会)

会议地点: 杭州

会议语种:英文

页码: 89-96

在线出版日期: 2018-10-28（万方平台首次上网日期，不代表论文的发表时间）