Abstract: The in-situ deformability of rocks and the state-of-stress must be known for the analysis and design of surface and underground structures. This paper presents a method for determining the ...

Abstract: In order to determine the factors affecting bearing temperatures—factors such as formation temperatures, rotary speed, bit thrust, airflow rate, and temperature—a pilot-scale laboratory micro-bit ...

Abstract: One mechanism of bit failure in geothermal drilling is thought to be directly related to the overheating of the bearings. High temperatures alter the microstructure of the bearing material and ...

Abstract: Numerical modeling of the rock-bit interaction process in laminated formation has been performed using a finite element approach. A finite element program was developed with the assumption of ...