A method to recover natural gas hydrates with geothermal energy conveyed by CO2
Xiaoyu Liu and
Energy, 2018, vol. 144, issue C, 265-278
A geothermal-assisted CO2 replacement method (GACR) was proposed, in which ambient-temperature CO2 is injected from the well head of a heat exchange well to the wellbore in geothermal reservoir for heating, and the heated CO2 then flows upward into the hydrate bearing layer (HBL) to accelerate the natural gas hydrate (NGH) dissociation. The GACR method, which is low-carbon and environment-friendly, requires no surface heating, recovers NGHs by means of combined thermal stimulation and CO2 replacement, and meanwhile achieves CO2 storage. Then a numerical simulation model was developed to investigate the heat exchange performance of the heat exchange well, the development performance of HBL, the CO2 storage performance and factors affecting such a development process. Calculations indicate that the temperature of the returned CO2 heated by the geothermal reservoir at the entry of HBL can be up to 68.9 °C, far beyond the temperature of HBL. Hence, GACR can fulfill the NGH recovery combining thermal stimulation and CO2 replacement. Compared with the depressurization method and the case with no geothermal reservoir, the cumulative CH4 production after 20 years of development can increase by 305% and 51.9% respectively, with a CO2 storage volume of 2.11 × 107 m3 and a storage factor of 14.5%.
Keywords: Natural gas hydrate; Geothermal energy; Thermal stimulation; CO2 replacement; Heat exchange well (search for similar items in EconPapers)
References: View references in EconPapers View complete reference list from CitEc
Citations View citations in EconPapers (1) Track citations by RSS feed
Downloads: (external link)
Full text for ScienceDirect subscribers only
This item may be available elsewhere in EconPapers: Search for items with the same title.
Export reference: BibTeX
RIS (EndNote, ProCite, RefMan)
Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:144:y:2018:i:c:p:265-278
Access Statistics for this article
Energy is currently edited by Henrik Lund and Mark J. Kaiser
More articles in Energy from Elsevier
Bibliographic data for series maintained by Dana Niculescu ().