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

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