Method and apparatus for drilling a subterranean formation...

Method and equipment for drilling control by vibration analysis

Method and system for controlling vibrations in borehole equipme

Method and system for installing cast-in-place concrete...

Methods and apparatus for attenuating drillstring vibrations

Methods and apparatus for attenuating drillstring vibrations

Process and apparatus for supersonic drilling in underground roc

Reduction of the frictional coefficient in a borehole by the use

Self-balancing drilling assembly and apparatus

Self-balancing vibratory drill apparatus

Sonic drilling method and apparatus

Sonic Drilling method and apparatus

Sonic large bore earth auger

Sonically assisted lubrication of journal bearings

Tuned support for cutting elements in a drag bit

Ultrasonic/sonic mechanism of deep drilling (USMOD)

Vibrator for drill stems

Vibratory rotary drilling tool