Magnetic freepoint sensor utilizing spaced hall effect devices

Marine riser measuring joint

Measurement of borehole temperature

Measurement system and method for quantitatively determining the

Measuring casing coupler apparatus

Measuring in situ stress, induced fracture orientation, fracture

Measuring reservoir oil saturation

Measuring torque and hook load during drilling

Method and apparatus for acoustic logging of fluid density and w

Method and apparatus for analyzing a multi-phase flow in a hydro

Method and apparatus for compensating for drilling line stretch

Method and apparatus for correcting MWD porosity measurement

Method and apparatus for data transmission in a well bore contai

Method and apparatus for detecting acoustic vibrations in a bore

Method and apparatus for detecting formation hydrocarbons in mud

Method and apparatus for detecting impending sticking of a drill

Method and apparatus for detecting the thermal characteristics o

Method and apparatus for detecting well pump-off

Method and apparatus for determing distribution of fluids in a p

Method and apparatus for determining a depth correction for a lo