Recently, prof. Ren Shaoran from College of Petroleum Engineering made new findings on the study of unconventional geothermal resources. Two papers, 'CO2 injection for geothermal development associated with EGR and geological storage in depleted high-temperature gas reservoirs' and 'Geothermal exploitation from hot dry rocks via recycling heat transmission fluid in a horizontal well' were released by Energy.
Geothermal resources include conventional geotherma (like hotspring,magma) and unconventional geothemal (like Hot Dry Rock, deep high saline aquifer and HTHP stratum). China abounds in geothermal resources and has huge potential of geothermal exploitation.
In the paper 'CO2 injection for geothermal development associated with EGR and geological storage in depleted high-temperature gas reservoirs', a a novel concept technology of CO2-HTGR system has been proposed to develop the geothermal energy in the depleted high-temperature gas reservoirs through CO2 injection associated with EGR and geological storage. It also finds that CO2-HTGR geothermal system has excellent heat mining performance and an effective CO2-HTGR can be established through EGR and pressure recovery.
The paper 'Geothermal exploitation from hot dry rocks via recycling heat transmission fluid in a horizontal well' proposed a new method for geothermal exploitation from hot dry rocks by recycling heat transmission fluid in a horizontal well via a closed loop which can avoide the costly and complex hydro-fracturing. Besides, numerical simulation models were established to calculate the heat mining rate for the new technology to assess its technical and economic feasibility. Sensitivity studies were performed to analyze the effects of various parameters on heat mining rate, including the injection rate, the horizontal segment length and the thermal conductivity of the tubing. The results showed that for low-temperature geothermal reservoirs, higher injection rate, longer horizontal wells and better thermal insulation of tubing can be applied to increase the heat mining rate.
Energy is an international, multi-disciplinary journal in energy engineering and research. It mainly covers the new achievements on the research of new energy, thermodynamics and interdisciplines. In recenty years, prof. Ren's group has concentrted the research on unconventional geothermal resources and CO2 utilization and has published a number of articles on Energy, Applied Energy, Journal of CO2 Utilization, international Journal of Greenhouse Gas Control.
See more about the papers:
http://www.sciencedirect.com/science/article/pii/S0360544217301421
http://www.sciencedirect.com/science/article/pii/S0360544217305923
Editor: Bu Lingduo
Source: UPC News Center
Updatetime: 2017-05-20
