Electricity: measuring and testing – Particle precession resonance – Using well logging device
Patent
1998-06-22
2000-09-19
Oda, Christine K.
Electricity: measuring and testing
Particle precession resonance
Using well logging device
324300, 324307, 324309, 324322, G01V 300
Patent
active
061217743
ABSTRACT:
The present invention relates generally to a method for eliminating ringing while measuring nuclear magnetic resonance properties of an earth formation traversed by a borehole. The measurement can be made while drilling or using a wireline tool. During a first time period of a single pulse sequence, the measurement includes the desired spin-echoes and the undesired effects, that is, ringing, measurement noise, and baseline shift. During a second time period of the single pulse sequence, the spin-echoes are eliminated but not the undesired effects. Using the signal collected during the second time period, the signals measured during the first time period are corrected to eliminate the ringing component, measurement noise, and baseline shift.
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patent: 5712566 (1998-01-01), Taicher et al.
E. Fukushima and S.B.W. Roeder, "Spurious Ringing in Pulse NMR", 33 J. Magn. Res., pp. 199-203 (1979).
Sun Boqin
Taherian Reza
Jeffery Brigitte L.
Oda Christine K.
Ryberg John J.
Schlumberger Technology Corporation
Shrivastav Brij B.
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