Data processing: measuring – calibrating – or testing – Measurement system in a specific environment – Earth science
Reexamination Certificate
2005-03-15
2005-03-15
McElheny, Jr., Donald (Department: 2857)
Data processing: measuring, calibrating, or testing
Measurement system in a specific environment
Earth science
C702S017000
Reexamination Certificate
active
06868341
ABSTRACT:
A method and apparatus for determining isolating and/or removing a signal of interest from acoustic data. The method and apparatus may be used to measure formation slowness in a cased borehole, in which case the signal of interest may be a casing arrival signal. The casing arrival signal may be detected, rebuilt and removed from a set of acoustic data. Semblance processing is applied to the acoustic data with the casing signal removed, yielding a coherent formation slowness log. A filter band may be defined and automatically administered to detect and remove the signal of interest such as the casing signal.
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Jeffery Brigitte
McElheny Jr. Donald
Ryberg John
Schlumberger Technology Corporation
Wang William L.
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