Systems and methods for deep-looking NMR logging

Details Systems and methods for deep-looking NMR logging Systems and methods for deep-looking NMR logging

2008-10-30

2010-06-08

Shrivastav, Brij B (Department: 2831)

Electricity: measuring and testing

Particle precession resonance

Using well logging device

C324S300000

Reexamination Certificate

active

07733086

ABSTRACT:
An NMR logging tool for conducting NMR measurements in a plurality of sensitive volumes ranging up to a meter from the tool. The tool comprises a magnetic assembly using one or more permanent magnets and at least one pole piece for extending a magnet pole and shaping the magnetic field to simulate a magnetic monopole in a sensitive volume within the formation. Different embodiments of a segmented antenna enable directional NMR logging. The tool embodiments and methods of their use are suitable for wireline or LWD logging, and can be used for directional drilling.

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