Acoustic measuring method for borehole formation testing

Communications – electrical: acoustic wave systems and devices – Seismic prospecting – Land-reflection type

Patent

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

367 27, 181102, 364422, G01V 140, G01V 1143

Patent

active

054673208

ABSTRACT:
An acoustic formation apparatus is set forth. It utilizes the drill bit on a drill stem as the acoustic source. At a common azimuth and spaced vertically along the drill stem, first and second acoustic transducers are installed. They connect to first and second amplifiers, first and second band pass filters, first and second clipping circuits, a single delay circuit and a cross correlating circuit. The signals are received, filtered, amplified, clipped, one delayed, and then cross correlation is made utilizing variable time delays. The resulting cross correlation function is analyzed using a microprocessor which removes stationary correlation peaks and ignores very short correlation delay times. This enables removal of the substantially fixed aspect of the pipe transmitted signal and the very fast propagating waves so that the processed cross correlation function output is substantially related to the formations and the larger, over powering signal transmitted along the drill string through the steel pipe making up the drill collars is substantially avoided.

REFERENCES:
patent: 4270180 (1981-05-01), Charlton
patent: 4543632 (1985-09-01), Ergas et al.
patent: 4862423 (1989-08-01), Rector
patent: 4964087 (1990-10-01), Widrow
patent: 5005144 (1991-04-01), Nakajima et al.
Poletto et al, 53rd EABC Mtg., May 26, 1991, pp. 566-567, ISBN 90-73 781-03-5.
Rector et al, 58th Int. Mtg. of SEG, Calif., pp. 1-23.
Nordy et al, 24th Ann. SPE et al. ofc (Houston) May 4, 1992, pp. 447-461; Abst. Enclosed Herewith.
Allen et al, Oilfield Rev, #1, pp. 4-17, Apr. 1989 Abst. Only Provided Herewith.

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Acoustic measuring method for borehole formation testing does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Acoustic measuring method for borehole formation testing, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Acoustic measuring method for borehole formation testing will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-1226007

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.