Magnetorheological fluid controlled mud pulser
Means for varying MWD tool operating modes from the surface
Measure while drilling system
Measurement while drilling bi-directional pulser operating...
Measurement while drilling tool and method
Measurement-while-drilling system and method
Measuring while drilling apparatus mud pressure signal valve
Measuring while drilling employing cascaded transmission systems
Measuring-while drilling system and method having encoder with f
Method and apparatus for communicating between spaced locations
Method and apparatus for communicating coded messages in a wellb
Method and apparatus for communicating coded messages in a...
Method and apparatus for communicating data in a wellbore and fo
Method and apparatus for communicating data in a wellbore and fo
Method and apparatus for downlink communication using...
Method and apparatus for filtering noise from data signals
Method and apparatus for generating fluid pressure pulses
Method and apparatus for generating fluid pressure pulses
Method and apparatus for improved communication in a wellbore ut
Method and apparatus for providing improved pressure pulse chara