| Title | Methods for Increasing Drilling Performance of the Thermal Spallation Drilling System |
|---|---|
| Authors | Dey, Thomas N.; Kranz, Robert L. |
| Year | 1985 |
| Conference | Geothermal Resources Council Transactions |
| Keywords | Drilling; LANL; Air Drilling; Thermal Drilling |
| Abstract | Current thermal spallation drilling methods offer advantages in performance and cost over conventional rotary methods. We have analyzed the mechanics of the thermal spallation process and found that heat transfer form the hot gases to the rock is the key process for limiting better penetration rates. Increasing the operating air pressure to 1000 psi will lead to a tripling of the penetration rate to about 60 ft/hr (18 m/hr) in granitic rock. |