Sample extractor

Sample sleeve with integral acoustic transducers

Sampling of drilling mud

Sampling resistivity of formation fluids in a well bore

Selective earth formation testing through well casing

Self-contained bore hole flow measurement system and method ther

Sensing impending sealed bearing and gage failure

Shear wave transducer for stress measurements in boreholes

Side entry sub with tension release wireline cable clamp

Side pocket mandrel pressure measuring system

Signal generator for a penetration rate measuring apparatus

Single probe downhole sampling apparatus and method

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