Method for on-line acoustic logging in a borehole

Details Method for on-line acoustic logging in a borehole Method for on-line acoustic logging in a borehole

1997-04-03

1998-06-30

Lobo, Ian J.

Communications, electrical: acoustic wave systems and devices

Seismic prospecting

Well logging

367 41, 367 57, G01V 140

Patent

active

057744181

ABSTRACT:
An instant acoustic logging method for use in oil drilling is disclosed in which a drill bit arranged at one end of a drill string and rotated in a well is used as the acoustic source. The method comprises the steps of measuring, at the top of the string, the vibration generated therein by the rotating drill bit, sensing acoustic signals from the drill bit at least one point on the ground away from said drill bit, and processing the signals to provide data on the rock around the well. The method comprises an additional preliminary step of processing the vibration measured at the top of the string to determine the nature of the pilot signals from the drill bit, the data on the rock around the well being obtained by comparing the acoustic signals sensed on the ground with the pilot signals from the drill bit.

REFERENCES:
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patent: 5358059 (1994-10-01), Ho
Rector et al., "the use of Drill-bit Energy as a Downhole Seismic Source", Geophysics, vol. 56, No. 5, pp. 628-634 May 1991.

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