Acoustic flow pulsing apparatus and method for drill string

Balance structure for rotating member

Damping device for an output shaft in a gearbox

Deep vibrator apparatus and method of use

Device for performing hydrodynamic action on wellbore walls

Downhole pressure fluctuating feedback system

Downhole pressure fluctuating tool

Downhole pressure pulse activated by jack element

Drilling apparatus

Drilling device utilizing sonic resonant torsional rectifier

Drilling efficiency through beneficial management of rock...

Drilling string torsional energy control assembly and method

Drilling system and method employing torsional sonic vibration f

Elastically vibratory longitudinal jacketed drill

Flow pulsing apparatus and method for down-hole drilling equipme

Flow pulsing apparatus for drill string

Flow pulsing method and apparatus for drill string

Fluidic oscillator drill bit

Internal power source for downhole detection system

Method and apparatus for damping vibrations in drill collar stri