Subsurface formation testing apparatus

Subterranean well pressure and temperature measurement

Sucker rod pump dynamometer

Surface hydraulic pump/well performance analysis method

Surface readout drill stem test control apparatus

Survey apparatus and methods for directional wellbore wireline s

Surveying of a borehole for position determination

System and method for detecting upward growth of a hydraulic sub

System and method for determining the relative permeability of a

System and method for hydrocarbon reserve evaluation

System and method for measurements of depth and velocity of...

System and method for measurements of depth and velocity of...

System and method for measuring and controlling rotation of...

System and method for monitoring drill bit depth

System and method for monitoring performance of downhole...

System and method for sensing leakage across a packer

System and method for sensing pressure using an inductive...

System and method having radiation intensity measurements...

System for detecting a native reservoir fluid in a well bore

System for detecting blow out and lost circulation in a borehole