Mass oscillator having an adjustable gas spring

Measurement of stand-off distance and drilling fluid sound speed

Mechanical filter

Method and apparatus for absorbing acoustic energy

Method and apparatus for absorbing acoustic energy

Method and apparatus for acoustic detection of a fluid leak...

Method and apparatus for acoustic formation dip logging

Method and apparatus for cancellation of unwanted signals in MWD

Method and apparatus for cancellation of unwanted signals in...

Method and apparatus for creating seismic waves in a borehole

Method and apparatus for cross-well seismic surveying

Method and apparatus for deploying a plurality of seismic...

Method and apparatus for determining the profile of a subterrane

Method and apparatus for detonation of distributed charges

Method and apparatus for detonation of distributed charges

Method and apparatus for forcing a member through material such

Method and apparatus for generating seismic waves

Method and apparatus for inspecting well bore casing

Method and apparatus for installing electronic equipment below s

Method and apparatus for suppressing waves in a borehole