Data processing: measuring – calibrating – or testing – Measurement system in a specific environment – Earth science
Reexamination Certificate
2007-06-18
2010-10-05
Barbee, Manuel L (Department: 2857)
Data processing: measuring, calibrating, or testing
Measurement system in a specific environment
Earth science
C702S009000, C702S085000, C073S152050, C250S264000
Reexamination Certificate
active
07809508
ABSTRACT:
A method for conducting density measurements in downhole environments corrects for high standoff, by adding a second correction term to the spine and rib method. This second term is a correction based on an apparent standoff estimated using the photo electric effect of the mud. This correction is term depends on the mud properties, both in terms of apparent standoff and correction and therefore requires property calibration for each well. The calibration can be done using the azimuthal information available with LWD tool when the tool is turning. At each depth in homogeneous formation, there can be a succession of density measurements with various tool standoff when the tool is not centered in the borehole. All this information is used to build up a standoff correction fitting perfectly the mud properties.
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Barbee Manuel L
Osha & Liang LLP
Schlumberger Technology Corporation
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