Device for receiving sound waves in a well

Device for securing two or more seismic energy sources at fixed

Dipole logging tool

Dipole/monopole acoustic transmitter, methods for making and usi

Displacement amplified acoustic transmitter

Disposable point with explosive charge for seismic exploration

Distributed charge for seismic prospecting

Distributed marine seismic source

Distributed seismic energy source

Down hole periodic seismic generator

Down hole seismographic source

Downhole electro-hydraulic vertical shear wave seismic source

Downhole electromagnetic seismic source

Downhole epicyclic motion orbital seismic source

Downhole hydraulic rotary seismic source

Downhole hydraulic seismic generator

Downhole liquid pressure seismic source and bit positioning syst

Downhole orbital seismic source

Downhole seismic array system

Downhole seismic energy source