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Method and apparatus for correcting a shear wave slowness estimate from a sonic well tool and producing an output medium reflecting a true value of shear wave slowness
Method and apparatus for correcting a shear wave slowness estimate from a sonic well tool and producing an output medium reflecting a true value of shear wave slowness
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机译：用于校正来自声井工具的剪切波慢度估计并产生反映剪切波慢度真实值的输出介质的方法和设备
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摘要
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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