Electricity: measuring and testing – Particle precession resonance – Using well logging device
Patent
1997-06-23
1999-11-02
Oda, Christine K.
Electricity: measuring and testing
Particle precession resonance
Using well logging device
324300, 324307, 324309, G01V 300
Patent
active
059777680
ABSTRACT:
Apparatus and method are disclosed for determining a nuclear magnetic resonance property of formations surrounding a borehole while drilling the borehole with a rotating drill bit on a drill string. An embodiment of the method includes the following steps: providing a logging device in the drill string, the logging device being rotatable with the drill string or a portion of the drill string, the logging device having a rotational axis; producing a static magnetic field and an RF magnetic field at the logging device, the static and RF magnetic fields having mutually orthogonal components in an investigation region in the formations surrounding the logging device, the magnitudes of the static and RF magnetic fields in the investigation region being substantially rotationally invariant as the logging device rotates around its axis; receiving nuclear magnetic resonance spin echoes at at least one circumferential sector on the logging device; and determining a nuclear magnetic resonance property of the formations, for different portions of the investigation region, from the received nuclear magnetic resonance spin echoes.
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Chang Shu-Kong
Sezginer Abdurrahman
Batzer William B.
Novack Martin M.
Oda Christine K.
Schlumberger Technology Corporation
Shrivastav Bmz B.
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