RESONANCE ENHANCED ROTARY DRILLING MODULE

摘要

Provided is apparatus for use in resonance enhanced rotary drilling, which apparatus comprises: ° (i) an upper load-cell for measuring static and dynamic axial loading; ° (ii) a vibration isolation unit; ° (iii) optionally an oscillator back mass; ° (iv) an oscillator for applying axial oscillatory loading to the rotary drill-bit; ° (v) a vibration transmission unit; ° (vi) a lower load-cell for measuring static and dynamic axial loading; ° (vii) a drill-bit connector; and ° (viii) a drill-bit, wherein the upper load-cell is positioned above the vibration isolation unit and the lower load-cell is positioned between the vibration transmission unit and the drill-bit, and wherein the upper and lower load-cells are connected to a controller in order to provide down-hole closed loop real time control of the oscillator.