Multi-directional assemblies for sonic logging

Multi-phase fluid flow measurement

Noise-attenuating positioners for acoustic well-logging tools

Nondestructive downhole seismic vibrator source and processes of

Nondestructive downhole seismic vibrator source and processes of

Oil and gas well kick detector

Piezoelectric seismic vibrator with hydraulic amplifier

Pneumatic wall-locking geophone system

Pressurized gas discharging apparatus for use as a down-bore sei

Process and device for seismic prospecting of a medium with indu

Process and devices for producing pressure - or shear-waves in a

Production logging mechanism for across-the-borehole measurement

Receiver array using tubing conveyed packer elements

Regenerative combustion device

Seismic energy source

Seismic probe more particularly usable in an untubed drilling sh

Seismic profiling tool with variable source/receiver spacer

Seismic prospecting method and device in wells allowing...

Seismic source

Seismic source system for use in water covered area