| Title | The Latest Development of High Temperature Borehole Tools in NEDO |
|---|---|
| Authors | T. Tosha, T. Kondo, H. Karasawa & Y. Egawa |
| Year | 2000 |
| Conference | New Zealand Geothermal Workshop |
| Keywords | |
| Abstract | The MWD (Measurement While Drilling) system and the PTSD (Pressure Temperature Spinner Density) logging tools with high temperature resistances have been developed in NED03 projects. The maximum operating temperature of the MWD and the PTSD systems are designed for 200?C and 4OO0C, respectively. The sonde of the MWD system has been manuhctured and tested in geothermal wells, to assess such aspects as the heat resistance of the battery. The PT- and S-probes of the PTSD system have been made with reasonable results. The D-probe is undergoing improvement. |