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ISSN Online: 2377-424X

ISBN Print: 978-1-56700-474-8

ISBN Online: 978-1-56700-473-1

International Heat Transfer Conference 16
August, 10-15, 2018, Beijing, China

LARGE-SCALE SIMULATIONS OF SUB-SEABED CO2 STORAGE IN THE FORM OF GAS HYDRATE

Get access (open in a dialog) DOI: 10.1615/IHTC16.cms.023784
pages 2051-2059

Abstract

Sub-seabed CO2 storage in the form of gas hydrate has been considered as a promising technology for CO2 capture and storage against global warming nowadays. In this study, in order to examine the possibility and feasibility of this new technology, a large-scale sub-seabed sediment model was built, and the processes of CO2 injection and CO2 hydrate formation in the sediments were simulated numerically. Then, some principal parameters, including the permeability of the overburden and underburden, the porosity, and CO2 injection rate, were investigated by the numerical simulations of seven cases. The simulation results indicate that a low-permeability overburden can effectively prevent the injected CO2 from leaking out of the reservoir, which can ensure the stability of CO2 storage in the sub-seabed sediments. On the other hand, the sediments with smaller porosity are much more suitable for CO2 reaction and CO2 hydrate formation in the reservoir, and a maximum CO2 injection rate of 100 ton/day is found to be the optimal value for the injection in the sediment model built in this study, which can both ensure CO2 storage capacity in the sub-seabed sediments. Based on the simulation results, the possibility and feasibility of this new technology for the field demonstration tests has been confirmed, so it is reasonable to say that this new technology can be expected to be applied to the real sub-seabed CO2 storage in the future.