Mizuho Information & Research Institute, Inc.

Hitoshi Koide

Junji Shinoda

A method and system for feeding liquefied carbon-dioxide gas into the ground, by which liquefied carbon-dioxide gas can be efficiently permeated and diffused in a deep aquifer. The disclosed method for feeding liquefied carbon-dioxide gas into the ground includes the following steps:using a pumping well to pump up water from a deep aquifer to aboveground; creating injection water; applying pulsatile hydraulic pressure to the injection water; feeding the injection water to which pulsatile hydraulic pressure has been applied into the deep aquifer via an injection well; feeding liquefied carbon-dioxide gas&#x2014;while maintaining carbon-dioxide gas in a liquefied condition&#x2014;from a storage tank into the injection well to a depth having such pressure and temperature in which the liquefied condition can be maintained; mixing the liquefied carbon-dioxide gas&#x2014;in the form of fine droplets&#x2014;with the injection water, thereby generating a mixture of those two liquids.

Method and device for feeding liquefied carbon-dioxide gas into an aquifer deep underground

The present invention provides a system for treating carbon dioxide, and a method by which such treated carbon dioxide can be stored underground at low cost and with high efficiency. The present invention' method for storing carbon dioxide underground includes: a step for pumping up to the ground groundwater from a pumping well in a deep aquifer, and then producing injection water. Carbon dioxide that has been separated and recovered from exhaust gas from a plant facility is changed into the bubbles. The bubbles are mixed with the injection water, and hereby produces a gas-liquid mixture a step for injecting into. The deep aquifer is injected into the gas-liquid mixture from the injection well. The method preferably further includes a step for dissolving a cation-forming material in the injection water, and a step for injecting the injection water, in which the cation-forming material is dissolved, into the deep acquifer at its top and above the place at which injection water has already been injected.

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Tokyo, Japan

Hitoshi Koide