| Title | Gwangju, South Korea Temperature Data for 3.5 Km Well |
|---|---|
| Authors | Maria RICHARDS, David BLACKWELL, Randy NORMANN, Daniel Kwangjae LEE, Moonseg HAN, Ramsey KWEIK, Cliff MAURONER |
| Year | 2015 |
| Conference | World Geothermal Congress |
| Keywords | temperature logging, temperature correction, drilling techniques, granite, thermal conductivity |
| Abstract | Continuous temperature data were collected by SMU Geothermal Lab and Perma Works LLC from a well bore in Gwangju, South Korea. The Hanjin D&B well was drilled to 3502 meters, with circulation stopping August 29, 2013 and the precision temperature logging occurred November 21-22, 2013. In 2012 the first temperature log was completed to 2500 meters by the Korean Institute of Geoscience and Mineral Resources (KIGAM). The KIGAM log was a week after drilling fluid circulation stopped at that depth. Comparison of the temperature logs shows similar trends in temperature and the effect of the drilling fluid on the borehole. Granite is the dominant lithology from the surface to the maximum depth of the borehole with only a small change in lithology between the depths of 1660 and 1690 meters, consisting of small pebble size fragments. The gradient at this site is 25 °C/km from 2000 to 3200 meters (the maximum depth the probe reached). Based on this gradient the well temperatures are expected to be 115°C at 4 km. Hanjin D&B will continue to drill the well with a goal of reaching 7 km by the beginning of 2015. The well is located such that it is part of a renewable energy park under construction and the hope is that this well will be able to generate power for the site. |