Compensation of magnetic influence in a MWD system

Details Compensation of magnetic influence in a MWD system Compensation of magnetic influence in a MWD system

2008-07-29

2008-07-29

Shrivastav, Brij B (Department: 2859)

Electricity: measuring and testing

Particle precession resonance

Using well logging device

C324S300000

Reexamination Certificate

active

11676462

ABSTRACT:
The present disclosure provides a downhole tool that includes a magnetometer and a nuclear magnetic resonance (NMR) sensor. One or more compensating magnets are provided on the tool to cancel or offset the effect of the magnetic field of the magnets of the NMR sensor on the magnetometer measurements made during drilling of a wellbore. The compensating magnets may have the same magnetic field characteristics as the sensor magnets and may be made of the same material.

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R. Bittner et al.;Magnetic Resonance While Drilling—A Quantum Leap in Everyday Petrophysics, SPE 100336, SPE Europec/EAGE Annual Conference and Exhibition, Vienna, Austria, Jun. 12-15, 2006, pp. 1-7.

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