This invention discloses a
drill string
assembly for air
impact directional drilling, comprising an
impact bit, a pneumatic impactor, an
impact damping sub, an air distribution sub, an anti-vibration air screw, a bidirectional damping sub, a locking sub, a non-magnetic
drill string, a conventional
drill string, and a keyed sub. The impact bit, pneumatic impactor, and impact damping sub constitute an impact rock-breaking
assembly; the air distribution sub, anti-vibration air screw, and bidirectional damping sub constitute a
directional drilling assembly; and the locking sub, keyed sub,
wireless measurement-while-drilling instrument, and non-magnetic
drill string constitute a
directional drilling assembly. This assembly enables impact
rock breaking, changing the traditional rock-breaking method of directional drill bits, reducing
rock breaking energy, decreasing
drill bit wear, and improving drilling efficiency in hard rock. It allows for rapid directional drilling in complex, easily leaky formations and hard formations with poor drillability, effectively improving drilling efficiency in complex formations, ensuring borehole trajectory adjustment accuracy, significantly improving directional drilling efficiency, and contributing to the development of directional drilling technology.