High impact communication and control system
Hydraulic impulse generator and frequency sweep mechanism...
Hydraulic oscillator for use in a transmitter valve
Hydraulic oscillator for use in a transmitter valve
Hydraulically balanced reciprocating pulser valve for mud...
Hydrophone for use in a downhole tool
Hydrophone for use in a downhole tool
Integrated modulator and turbine-generator for a measurement whi
Inverse vertical seismic profiling using a measurement while dri
Logging while drilling tools, systems, and methods capable of tr
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