Technique for investigating stand-off in a borehole

Details Technique for investigating stand-off in a borehole Technique for investigating stand-off in a borehole

G - Physics

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G01V 1/40 (2006.01) E21B 47/08 (2006.01) G01B 17/00 (2006.01) G01H 5/00 (2006.01) G01V 1/46 (2006.01)

Patent

CA 1192296

METHOD AND APPARATUS FOR INVESTIGATING STAND-OFF IN A BOREHOLE Abstract of Disclosure An acoustic method and apparatus for investigating an earth formation penetrated by a borehole are described. Acoustic transducers are mounted on a tool to accurately determine the distance between a segment of the tool and the wall of the borehole. The acoustic transducers are positioned in such manner that the stand-off distance between individual resistivity measuring electrodes in an array, which is also mounted on the tool segment, and the borehole wall can be measured. The stand-off measurement is recorded and may be used to correct the electrode resistivity measurements. In one embodiment a calibration of acoustic transducers as a function of depth is obtained by employing acoustic calibrat- ing transducers to compensate for borehole environment ef- fects on the performance of the acoustic transducers as well as determine the acoustic velocity of the borehole fluid, such as mud. Several embodiments are described.

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