Layer density determination using surface and deviated borehole
Liquid level detection
Liquid level detection
Liquid sampling apparatus
Load cells for sensing weight and torque on a drill bit while dr
Log correlation method and apparatus
Logging apparatus for a core sample cutter
Logging method and system for measuring mechanical parameters of
Logging tool
Logging tool for cement evaluation
Logging while drilling method and apparatus for measuring stando
Logging while raising a drill string
Long range data transmitter for horizontal directional drilling
Low-water-pressure controlled hydrologic test method