Measurement-while-drilling acoustic system employing multiple, segmented transmitters and receivers
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United States of America Patent
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Jul 4, 2000
Issued Date -
N/A
app pub date -
May 26, 1998
filing date -
Jan 12, 1995
priority date (Note) -
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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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