Parallel seismic depth testing using a cone penetrometer
Passive flowmeter for determining the flow rate and the directio
Percussion method and apparatus for the investigation of a casin
Permeability determinations through the logging of subsurface fo
Pipeline monitoring array
Plug release indicator
Polish rod temperature sensing system and rod stroking control
Polished rod load transducer
Pore pressure formation evaluation while drilling
Portable tester for downhole motors
Portable well analyzer
Power control system for subsurface formation testing apparatus
Precision measuring system for down-hole production logging oil
Preparation unit for a drilling mud testing system
Pressure actuator switch
Pressure and temperature compensation means for a downhole force
Pressure communicating, fluid isolating interface
Pressure controlled test valve system for offshore wells
Pressure core barrel flushing system
Pressure gauge