Measuring and testing – Borehole or drilling – Formation logging
Reexamination Certificate
2005-07-19
2005-07-19
Williams, Hezron (Department: 2856)
Measuring and testing
Borehole or drilling
Formation logging
C250S254000, C250S264000, C250S267000
Reexamination Certificate
active
06918293
ABSTRACT:
We disclose density measurement methods that are accurate over an extended range of standoff distances. One method embodiment includes: a) obtaining a standoff distance, a near detector count rate, and a far detector count rate; b) determining a formation density measurement using near and far detector count rates when the standoff distance is less than a predetermined value; and c) determining the formation density measurement using just the far detector count rate and the standoff distance measurement when the standoff distance is greater than the predetermined value. The method may further include calculating a calibration parameter when the standoff distance is less than the predetermined value. The calibration parameter serves to calibrate a standoff-based correction to the far detector count rate, enabling accurate formation density measurements at large standoff distances. The measurements are made with a rotating logging tool, causing the standoff distance to cycle between large and small values.
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Moake Gordon L.
Truax Jerome A.
Conley & Rose, P.C.
Halliburton Energy Service,s Inc.
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