Situ determination of hydrocarbon characteristics including oil

Slick line system with real-time surface display

Soil sampling apparatus

Soil-percolation testing method and apparatus

Solvent disperser for removing oil from sponge core

Sonde with rotatable pad for carrying out logging measurements i

Sonic attenuating method for distinguishing between oil, water a

Sonic gas detector for rotary drilling system

Spinner flowmeter with isolated bearings

Spinner tool for boreholes

Steam injection survey apparatus and method for testing wells

Steam profile liquid/vapor separator

Steam quality and flow rate measurement

Steerable motor system with integrated formation evaluation logg

Stickometer

Strain monitoring system

Stuck point indicating device with linear sensing means

Stuck well pipe apparatus

Submersible sensor

Subsurface differential pressure recorder