Adjustable gauge downhole drilling assembly

Adjustable gauge downhole drilling assembly

Adjustable winged centering tool for use in pipes with...

Apparatus and method for drilling and reaming a borehole

Apparatus for drilling underground arcuate paths and installing

Apparatus for gripping a shaft or the like

Apparatus for preventing differential sticking in wells

Apparatus for use in a wellbore

Axle, a friction reducing fitting and an axle installation...

Bit retainer system

Bit-adjacent stabilizer and steel

Blade stabilizer provided with at least one fluid passage having

Borehole conditioning apparatus

Breakable washer earth boring bit

Casing tube with casing shoe

Centering device that can be engaged or disengaged, specifically

Clamp-on drill collar stabilizers

Collar mounted downhole tool

Combined stabilizer and reamer for drilling well bores

Compensating ring for a down hole hammer