Boots – shoes – and leggings
Patent
1992-02-09
1993-07-20
Envall, Jr., Roy
Boots, shoes, and leggings
367 25, 367 75, G01V 100, G06F 1548, G06F 1550, G06G 700, G06G 776
Patent
active
052299392
ABSTRACT:
A borehole correction software of a multipole sonic well tool adapted to be disposed in a borehole determines a true, corrected value of shear wave slowness from a measured uncorrected shear wave slowness value by first building a look up table comprising hole diameter, measured synthetic shear wave slowness and correction factor, and using the table in a system including the look up table and a multiplier to determine a bias, which bias is subtracted from the measured uncorrected shear wave slowness to produce an output medium reflecting a true, corrected value of shear wave slowness. The measured uncorrected shear wave slowness values are input to the look up table. For a given hole diameter, the measured uncorrected shear wave slowness is matched to a measured synthetic shear wave slowness, and a value of correction factor is determined from the table. The correction factor is multiplied by the measured uncorrected shear wave slowness, via the multiplier, and a bias figure is determined. The bias figure is subtracted from the measured uncorrected shear wave slowness value, and a true, corrected shear wave slowness figure is the result. A plurality of the true, corrected shear wave slowness figures are determined using this technique and an output medium is produced which displays a log reflecting the true corrected shear wave slowness figures. This output medium may include a computer printout, the printout being given to a customer for his analysis of the characteristics of a formation within the borehole and the possibility of oil existing in the formation.
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Scheibner David J.
Wu Peter T.
Bouchard John H.
Brutman Laura
Envall, Jr. Roy
Garrana Henry N.
Schlumberger Technology Corporation
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