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→Ultrasonic reflection technique: the borehole televiewer
==Ultrasonic reflection technique: the borehole televiewer==
==Ultrasonic reflection technique: the borehole televiewer==
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file:borehole-imaging-devices_fig1.png|'''Figure 1.''' Borehole televiewer technique.<ref name=pt04r23>Zemanek, J., Caldwell, R. L., Glenn, E. E., Holcomb, S. V., Norton, L. J., Straus, A. J. D., 1969, The Borehole Televiewer—a new logging concept for fracture location and other types of borehole inspection: Journal of Petroleum Technology, v. 21, p. 762–774, DOI: [https://www.onepetro.org/journal-paper/SPE-2402-PA 10.2118/2402-PA].</ref>
file:borehole-imaging-devices_fig1.png|'''Figure 1.''' Borehole televiewer technique.<ref name=pt04r23>Zemanek, J., R. L. Caldwell, E. E. Glenn, S. V. Holcomb, L. J. Norton, and A. J. D. Straus, 1969, The Borehole Televiewer—a new logging concept for fracture location and other types of borehole inspection: Journal of Petroleum Technology, v. 21, p. 762–774, DOI: [https://www.onepetro.org/journal-paper/SPE-2402-PA 10.2118/2402-PA].</ref>
file:borehole-imaging-devices_fig2.png|'''Figure 2.''' Drill marks (arrow) on borehole televiewer images.
file:borehole-imaging-devices_fig2.png|'''Figure 2.''' Drill marks (arrow) on borehole televiewer images.
file:borehole-imaging-devices_fig3.png|'''Figure 3.''' Borehole televiewer Image showing fracture (arrow) crossing the wellbore.
file:borehole-imaging-devices_fig3.png|'''Figure 3.''' Borehole televiewer Image showing fracture (arrow) crossing the wellbore.