Adjustable length drilling sub

Adjustable stabiliser for directional drilling

Anti-rotation device for a steerable rotary drilling device

Apparatus for directional drilling

Articulated directional drilling motor assembly

Closed loop drilling assembly with electronics outside a...

Control of at least two stabilizing arms in a drill or core devi

Control system for a drilling apparatus

Controlled directional drilling tool

Directional drilling apparatus

Directional drilling tool

Downhole tool for controlling the drilling course of a borehole

Drill steering apparatus

Drill steering apparatus

Drill steering apparatus

Extension and retraction mechanism for subsurface drilling equip

Flexible directional drilling apparatus and method

Integrated directional under-reamer and stabilizer

Lightweight drill pipe

Method and apparatus for horizontal drilling