Measurement-while-drilling acoustic system employing multiple, s

Details Measurement-while-drilling acoustic system employing multiple, s Measurement-while-drilling acoustic system employing multiple, s

1998-05-26

2000-07-04

Horabik, Michael

Communications, electrical: acoustic wave systems and devices

Wellbore telemetering

Through drill string or casing

367 81, 367 25, 3408555, 181102, H04H 900

Patent

active

06084826&

ABSTRACT:
This invention is directed toward apparatus and methods for obtaining acoustic measurements or "logs" of earth formations penetrated by a borehole. More particularly, the invention is directed toward obtaining the acoustic measurements while the borehole is being drilled. The downhole apparatus comprises a plurality of segmented transmitters and receivers which allows the transmitted acoustic energy to be directionally focused at an angle ranging from essentially 0 degrees to essentially 180 degrees with respect to the axis of the borehole. Downhole computational means and methods are used to process the full acoustic wave forms recorded by a plurality of receivers. A two way communication system is also used in the preferred embodiment of the invention.

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patent: 5640371 (1997-06-01), Schmidt et al.
patent: 5796677 (1998-08-01), Kostek et al.
"Sonic compressional Measurements While Drilling"; J. Aron, S.K. change, R. Dworak, K. Hsu, T. Lau, J.P. Mason, J. Mayes, G. McDaniel, C. Randall, S. Kostek, T.J. Plona; SPWLA, 35.sup.th Annual Logging Symposium , Jun. 19-22, 1994, pp. 1-17.

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