Rotary drag bits having a pilot cutter configuraton and...

Rotary drill bit and method of forming bore hole

Rotary drill bit insert

Rotary drill bit providing separation of liquid from gas

Rotary drill bits with gage pads having improved...

Rotary drill guard assembly and method

Rotary drill indexing system

Rotary drilling drill string stabilizer-cuttings grinder

Rotary driven pipe-bursting tool

Rotary sidewall sponge coring apparatus

Rotary steerable devices and methods of use

Rotary steerable drilling tool

Rotary steerable drilling tool and associated method of use

Rotary steerable well drilling system utilizing hydraulic servo-

Rotary steerable well drilling system utilizing sliding sleeve

Rotary-percussion drill apparatus and method

Rotatable drill shoe

Rotating drilling head drive

Rotating drilling head gripper

Rotating systems associated with drill pipe