| Title | Application of different technologies to use deep drill holes for geothermal heat supply in the Russian Federation |
|---|---|
| Authors | B.N.Khakhaev, M.I.Kalinin |
| Year | 2003 |
| Conference | International Geothermal Workshop, Russia |
| Keywords | Geothermal circulation systems, heat pumps |
| Abstract | Two modern technologies for development of geothermal resources are compared: hydrothermal resources ñ by using a doublet consisting of production and injection wells the so-called geothermal circulation system (GCS); petrothermal resources ñ a single ñ drillhole design by using a deep borehole heat exchanger. Based on an example of the Yaroslavl Region it is shown that at a moderate geothermal rock gradient typical for the central parts of Russia GCS technolies with 2.2 km deep holes can provide thermal power totalled from 4-6 to scores of megawatts. FGUP NPTs "Nedra" has worked out feasibility reports with participation of German specialists: for a block of houses with 8000 dwellers, for a rural settlement and others. Application of a single ñ drillhole technology reduces thermal power to 0.3-0.7 MW from one hole (including thermal transformation and peak heating). At low costs for restoration of old hole a deep heat exchanger technology is effective and economically profitable for some facilities in the central regions of Russia and under favourable geothermal conditions (geothermal gradient 5oC and higher at a depth of 100 m) it becomes profitable to drill two new 1.9 km deep holes near the consumer with a total power capacity up to 3MW as it is true for the regions of the Northern Caucasus. Application of different technologies facilitates distribution of resource-saving and ecologically safe projects for heat supply in Russia and under involement of internation institutions into a practical realization of projects with high capital investments it will contribute to solution of a strategic task on development of geothermal power generation in the Central and East Europe. |