New Technology with Composite Percussion Drilling and Rock Breaking

In order to solve the limitations of conventional rotary drilling and torsional drilling in drill bit matching and adaptability, a new composite percussion drilling technology for rock breaking was proposed. In addition, a new composite percussive drilling tool was also developed to achieve reversal torsional percussion and torsional pulse percussion. The drilling tool could convert the hydraulic energy of fluids into alternative mechanical energy of torsional and axial high-frequency percussion and directly transfer it to the bit. Thus, periodic low-amplitude high-frequency composite percussion was applied to the bit in order to improve rock breaking efficiency without equipment change. Based on the rock breaking principle of composite percussion drilling technology, this paper details the structure and working principles of the composite drilling tools, key parameters affecting rock breaking efficiency, and more. The new composite percussion drilling technology for rock breaking can be used to achieve three-dimensional rock breaking to improve the rate of penetration and to enhance well bore quality.