Carbon dioxide geological sequestration method based on mixed fluid self-detaching

Abstract

The invention discloses a method of carbon dioxide geological sealing based on the self-detaching of mixed fluid and relates to a method of carbon dioxide geological sealing. The invention comprises the following steps: (1) forming an injection well (10) and an emission well (20) in a selected geological sealing site; (2) injecting the mixed fluid containing CO2 continuously by a high pressure injection device into a geological sealing layer (43) through the injection well (10); (3) releasing the fluid moving to the emission well (20) through the emission well (20); (4) injecting the mixed fluid and releasing the emission well (20) continuously until the concentration of CO2 in the fluid discharged by the emission well (20) is larger than the economic concentration value. The invention is suitable for the field of CO2 geological sealing and for sealing CO2 in a deep brine layer, which is especially suitable for the CO2 geological sealing of the deep brine layer of the structure of inclined formation and dome.

Description

technical field [0001] The present invention relates to a carbon dioxide (CO 2 ) geological storage method, especially related to a CO based on mixed fluid self-separation 2 Geological storage methods, mainly for CO 2 CO in deep brine formations (deep aquifers) 2 Geological storage. Background technique [0002] Currently CO 2 The main types of site geological structures used in geological storage methods are: oil and natural gas reservoirs, deep brine formations (abbreviated as deep aquifers), unminable coal seams, basalt and other geological structures. In each type, CO 2 of geological storage will be CO 2 Compressed and injected into subterranean rock formations. Currently CO 2 The methods used in geological storage are: CO 2 -EOR(CO 2 enhanced oil recovery), CO 2 -ECBM (CO 2 enhanced coalbed methane mining method), CO 2 Natural gas displacement and gas field storage, CO 2 Deep aquifer storage, CO 2 Basalt storage, CO 2 Abandoned mine storage, CO 2 Rock s...

AI Technical Summary

Problems solved by technology

[0004] Above CO 2 Geological storage methods all use very high purity CO 2 gas (e.g. CO 2 Concentration>95%) for geological storage, so the CO 2 The requirements for gas source capture are particularly high, resulting in high storage costs, and it is difficult to reduce the capture cost in a short period of time. New methods must be found to reduce the cost of geological storage

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