Electricity: measuring and testing – Particle precession resonance – Using well logging device
Patent
1997-09-25
2000-12-26
Oda, Christine K.
Electricity: measuring and testing
Particle precession resonance
Using well logging device
G01U 300
Patent
active
061665436
ABSTRACT:
The present invention relates generally to an apparatus and method for measuring nuclear magnetic resonance properties of an earth formation traversed by a borehole by generating gradient-echoes. The measurement can be made while drilling or using a wireline tool. The apparatus applies a static magnetic field, B.sub.a, in a volume of the formation which polarizes the nuclei of hydrogenous connate fluids within the formation. The apparatus applies a second magnetic field, B.sub.b, in a volume of the formation. The magnetic fields B.sub.a and B.sub.b are substantially orthogonal in the volume of the formation. A change in the polarity of the magnetic field, B.sub.b, reverses the direction of precession of the nuclei thereby generating a train of gradient-echoes. Each gradient-echo signal is transformed into the frequency domain and the signal frequency is mapped to a radial position in the volume of the formation in order to generate an image of the formation. Various properties of the formation, such as the effective diffusion coefficient of the formation fluid, longitudinal relaxation time, spin--spin relaxation time, and porosity can be estimated from the train of gradient-echoes.
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Sen Pabitra N.
Sezginer Abdurrahman
Sun Boqin
Taherian Mohammad Reza
Fetzner Tiffany A.
Jeffery Brigitte L.
Oda Christine K.
Ryberg John J.
Schlumberger Technology Corporation
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