G - Physics – 01 – V
Patent
G - Physics
01
V
G01V 3/32 (2006.01) G01R 33/44 (2006.01)
Patent
CA 2298457
A technique is disclosed for obtaining nuclear magnetic resonance measurements from formations surrounding an earth borehole, including the following steps: providing a logging device that is movable through the borehole and through formations in which a static magnetic field is present; producing, from the logging device, a series of cycles of pulse sequences in the formations, each of the pulse sequences including an RF excitation pulse and several RF refocusing pulses; receiving, at the logging device, spin echoes from the formations to produce spin echo signals that may include spurious ringing signals from the excitation and refocusing pulses; and combining spin echo signals from corresponding spin echoes of each of the cycles of pulse sequences to obtain combined spin echo signals in which spurious ringing from the excitation pulses and refocusing pulses of the pulse sequences is substantially cancelled. In a preferred embodiment, the steps of producing cycles of pulse sequences and combining spin . echo signals include manipulating the polarities of the excitation and refocusing pulses to obtain the substantial cancellation of the spurious ringing from the excitation and refocusing pulses.
Ganesan Krishnamurthy
Speier Peter
Straley Christian
Sun Boqin
Taherian Reza
Schlumberger Canada Limited
Smart & Biggar
LandOfFree
Nuclear magnetic resonance well logging method and apparatus does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Nuclear magnetic resonance well logging method and apparatus, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Nuclear magnetic resonance well logging method and apparatus will most certainly appreciate the feedback.
Profile ID: LFCA-PAI-O-1475946