Sensor in bit for measuring formation properties while drilling

Service tee marker fixture with concentric attachment sleeve

Shallow marine electromagnetic hydrocarbon prospecting

Shield tunneling system capable of electromagnetically detecting

Shielded induction sensor for well logging

Shielding apparatus for selective attenuation of an...

Shielding method and apparatus for selective attenuation of...

Shielding method and apparatus using flexible strip

Shielding method and apparatus using transverse slots

Shields for antennas of borehole logging devices

Shields for antennas of borehole logging devices

Signal generator for electromagnetic surveying that produces...

Signal processing apparatus for frequency domain geophysical ele

Simultaneous current injection for measurement of formation...

Simultaneous time-domain and frequency-domain metal detector

Single-switching method of eliminating the effect of electromagn

Skin depth compensation for an in-ground transmitter

Skin depth compensation in underground boring applications

Slotted tubulars for subsurface monitoring in directed...

Small hole well logging sonde and system with transmitter and re