Magnetic signalling in pipelines

Magnetic signalling in pipelines

Measurement while drilling electromagnetic telemetry system...

Measurement while drilling mud pulser control valve mechanism

Measurement-while-drilling acoustic system employing...

Measuring tool for collecting down hole information and metering

Method and apparatus enhanced acoustic mud pulse telemetry

Method and apparatus for communicating signals from within an en

Method and apparatus for communicating with downhole measurement

Method and apparatus for data communication with an...

Method and apparatus for data transmission between a transmissio

Method and apparatus for determining alignment of borehole tools

Method and apparatus for determining position in a pipe

Method and apparatus for determining position in a pipe

Method and apparatus for downhole signal communication and...

Method and apparatus for enhanced acoustic mud pulse...

Method and apparatus for exploring earth and rocky formations

Method and apparatus for high speed data dumping and...

Method and apparatus for locating faults in wired drill pipe

Method and apparatus for LWD shear velocity measurement