Free fall survey instrument

Hydraulic strain sensor

Hydraulic test system mounted with borehole television set for s

Instrumentation tubing string assembly for use in wellbores

Isolator bar for acoustic instruments used in downhole...

Long range data transmitter for horizontal directional drilling

Method and apparatus for detecting torsional vibration with...

Method and apparatus for determining downhole pressures...

Method and apparatus for estimating a property of a downhole...

Method and apparatus for estimating a property of a downhole...

Method and apparatus for improved measurement of drilling condit

Method and apparatus for measuring multiple parameters of steam

Method and apparatus for sensing and displaying torsional vibrat

Method and system for detecting conditions inside a wellbore

Method and system for detecting the longitudinal...

Method and system for predicting the appearance of a dysfunction

Method and system for real-time estimation of at least one param

Method and system for real-time estimation of at least one param

Method and system of trajectory prediction and control using PDC

Method for determining drill collar whirl in a bottom hole...