| 摘要 |
PCT No. PCT/FR92/00169 Sec. 371 Date Nov. 20, 1992 Sec. 102(e) Date Nov. 20, 1992 PCT Filed Feb. 25, 1992 PCT Pub. No. WO92/14908 PCT Pub. Date Sep. 3, 1992.A method for automatically monitoring the vibrational condition of a drill string fitted with detectors comprises the following steps: obtaining a reference spectrum for each detector; obtaining a spectrum for each detector representing the actual situation; comparing the two spectra to detect possible instabilities in the values measured by the detectors; indication of said instabilities by means of audio and/or visual devices. |
