Oil well pressure sensing system
Oil well production testing
Oil well sucker rod load measurement
Open hole formation testing
Oxygen activation method for quantitative water flow measurement
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