Measuring and testing – Borehole or drilling – Formation logging
Reexamination Certificate
2005-05-31
2005-05-31
Williams, Hezron (Department: 2856)
Measuring and testing
Borehole or drilling
Formation logging
C324S338000
Reexamination Certificate
active
06898967
ABSTRACT:
A method of measuring resistivity values in relation to the azimuthal displacement of a measurement sensor displayed on a measurement-while-drilling device in a wellbore environment is disclosed. The present invention also provides an instantaneous reading of resistivity values. A resistivity sensor measures a volume having a circular cross-section, and whose center is the geometric center of the tool. Averaging removes measurement errors, such as those due to tool motion. Information on the formation resistivity is obtained as a function of the location of the center of the tool. A method of acoustic standoff determines offset of the drill tool and distances to walls. The operator gains knowledge of bedding layer formation and dip from azimuthal dependence of standoff and resistivity values.
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Baker Hughes Incorporated
Fitzgerald John
Madan Mossman & Sriram P.C.
Williams Hezron
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