Method and apparatus for stabilizing borehole cores

Method and apparatus for steering an earth boring tool

Method and apparatus for subsoil drilling

Method and apparatus for subsoil drilling

Method and apparatus for taking an undisturbed core sample

Method and apparatus for taking core samples from a subterranean

Method and apparatus for thin-walled tube sampling of soils

Method and apparatus for transferring core sample from core...

Method and apparatus for treating a productive zone while...

Method and apparatus for upwardly cutting full cutting face of a

Method and apparatus for use when changing the direction of a we

Method and apparatus for using multiple jets

Method and apparatus for varying the density of drilling...

Method and apparatus for varying the density of drilling...

Method and apparatus for water jet drilling of rock

Method and apparatus of a self-aligning sleeve for the correctio

Method and apparatus with slips assembly for coupling...

Method and appartus for directing drilling fluid to the cutting

Method and arrangement for improving cuttings removal and reduci

Method and arrangement for reducing dust-related problems in...