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A Calculation Model for Liquid CO 2 Injection into Shallow Sub‐Seabed Aquifer
Author(s) -
SASAKI KYURO,
AKIBAYASHI SATOSHI
Publication year - 2000
Publication title -
annals of the new york academy of sciences
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.712
H-Index - 248
eISSN - 1749-6632
pISSN - 0077-8923
DOI - 10.1111/j.1749-6632.2000.tb06775.x
Subject(s) - aquifer , seabed , geology , seawater , supercritical fluid , groundwater , geotechnical engineering , oceanography , chemistry , organic chemistry
A bstract : This study provided a model for calculating the aquifer transmissibility, the CO 2 injection rate, the inner diameter of the injection well, and the number of wells for liquid CO 2 disposal in the aquifer. The possibility of disposing liquid CO 2 in an aquifer just beneath the sea floor was shown, based on the equilibrium lines in the pressure and temperature map. Our study focused on the feasibility of liquid CO 2 disposal below the critical temperature because CO 2 can be denser in the low‐pressure range (below the critical temperature) than above the critical temperature. An aquifer about 200 m under the sea floor, at a water depth of around 500 m (700 m below the sea surface), will serve for liquid CO 2 disposal. In the aquifer the absolute pressure is approximately 7.3 MPa, sea‐floor temperature is about 4–6°C, and aquifer temperature is about 15–20°C. Therefore, it can be assumed that CO 2 dissolves in the aquifer water, and liquid CO 2 replaces the water. This means that under the previous conditions, more CO 2 can be injected into the aquifer compared to supercritical conditions. Furthermore, by forming a cap of CO 2 hydrates, the sediment between the sea floor and the aquifer, prevents CO 2 leakage to the sea. Even without the cap, liquid CO 2 and CO 2 hydrates form at the sea floor, so the CO 2 exerts no large environmental impact.