Is a
Patent attributes
Current Assignee
Patent Jurisdiction
Patent Number
Date of Patent
February 20, 2007
Patent Application Number
10839478
Date Filed
May 5, 2004
Patent Primary Examiner
Patent abstract
NMR spin echo signals, acquired on a MWD logging tool, are susceptible to errors magnetic flux density has a gradient and the magnet on the logging tool is moving relative to the earth. The errors can be corrected by having the excitation pulse cover a smaller or a larger volume than the refocusing pulses. Correction may also be made by selective saturation, or by echo averaging.
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