MICROTUNNELING APPARATUS

Abstract: this invention relates to a drill string () for use with micro tunnelling apparatus () having a cutter () at a distal end of the drill string () and external drive mechanism () at a proximal end of the drill string (). the drill string () being formed by a plurality of connected string segments (), each string segment () with a drive shaft () aligned along the central axis for rotation there about and an elongate casing () that houses the drive shaft (). the front end of one string segment () is adapted to connect with the back end of another string segment () to form the drill string () by way of a latch connection, the latch connection being adjustable so as to vary the tolerance between said front end of one string segment () and said back end of another string segment () while connected.

Inventor(s): Albert Fourie, Allen Henley, Stuart Ronald Harrison, Gregory Alan Geldard

CPC Classification: E21B17/046 (EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS)

Search for rejections for patent application number 20250215753