Magnetization of target well casing strings tubulars for...

Magnetometer circuitry for use in bore hole detection of AC magn

Magnetometer with waveform shaping

Magnetotelluric geophysical survey system using an airborne...

Marine electromagnetic measurement system

Marine oil and gas exploration system using telluric...

Marine surveying apparatus and method for locating pipelines bur

Maritime apparatus for locating a buried submarine cable

Matching amplifier having an extremely high input resistance for

Measurement device and support for use in a well

Measurement of in-phase and out-of-phase components of low frequ

Measurement of subterranean lithology using electromagnetic...

Measurement of vector components of static field perturbations f

Measurement tool for obtaining tool face on a rotating drill...

Measurements of electrical properties through non...

Measuring and evaluating surface potentials for determining the

Measuring equipment and method for mapping the geology in an...

Measuring focused through-casing resistivity using induction...

Measuring pad arrangement for a logging sonde

Measuring resistivity changes from within a first cased well to