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Survey and analysis serviceCO2 underground storage technology is classified into storage to an aquifer, fixing to a coal bed, storage to a petroleum and gas reservoir (Enhanced Oil recovery (EOR) and isolation to a drained oil gas reservoir). Mitsubishi Materials Techno Corporation creates various projects for utilizing these technologies, and takes part in the projects.
CO2 storage technology to an aquifer
A rock consisting of sands and mud layers is called a sedimentary rock. Water permeating to the underground from the distant mountain is stored in a stratum consisting of comparatively coarse grains of sand. This stratum is called an aquifer. Since the aquifer has many pores where water is stored, a method of injecting liquid CO2 to the pore is a storage technology to aquifer.
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CO2 fixing technology to coal bed
Coal bed is made of a carbonized plant which grew on the ground several tens to hundreds of millions years ago and was buried in the ground. So, the coal has many small pores, and gases, such as methane, are stored in the pores. The fixing technology to a coal bed is a method injecting CO2 into the pores of the coal bed and extracting methane instead of CO2.
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Storage technology to petroleum and gas reservoir
Petroleum and gas are extracted from well (drill hole), a deep borehole from a ground to a stratum called sedimentary rock at a deep place in underground. In order to efficiently extract the petroleum and gas, a method that water and sea water are injected in from another hole separating a few distance from the well so as to push out the underground petroleum and gas, is known. Applying this technology, the method for injecting liquid CO2 instead of water or sea water as is a storage technology to a petroleum and gas reservoir.
