The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 20, 1993
Filed:
Feb. 09, 1992
David J Scheibner, Houston, TX (US);
Peter T Wu, Houston, TX (US);
Schlumberger Technology Corporation, Houston, TX (US);
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.