Open AccessCyclic pumping technique to increase CO2 sequestration in fractured geothermal reservoirs
Author(s) -
Kelvin Bongole,
Zheng Sun,
Jun Yao,
James Mboje,
Chuanyin Jiang,
Tong Wang
Publication year - 2019
Publication title -
iop conference series. earth and environmental science
Language(s) - English
Resource type - Journals
eISSN - 1755-1307
pISSN - 1755-1315
DOI - 10.1088/1755-1315/332/3/032038
Subject(s) - geothermal gradient , extraction (chemistry) , carbon sequestration , carbon dioxide , atmospheric pressure , petroleum engineering , environmental science , geology , materials science , chemistry , geophysics , chromatography , oceanography , organic chemistry
Carbon dioxide (CO 2 ) sequestration in deep geothermal reservoirs is one of the promising technique to reduce global temperature by decreasing the atmospheric CO 2 content. In this study, a cyclic pumping technique is proposed and applied in an enhanced geothermal system (EGS) for CO 2 sequestration together with heat mining process. Cyclic pumping at higher frequency (small interval of days) can significantly increase the accumulated amount of CO 2 sequestrated. Reducing the pumping frequency results to lower amounts of CO 2 sequestrated, less than using a fixed pumping pressure. The pumping frequency refers to the number of days between maximum to minimum pressure interchange. Furthermore, compared to a fixed low pumping pressure, a cyclic pumping technique improves geothermal heat extraction ratio, thus higher performance of the EGS.