Subsurface borehole evaluation and downhole tool position...

Details Subsurface borehole evaluation and downhole tool position... Subsurface borehole evaluation and downhole tool position...

E - Fixed Constructions

21

B

E21B 47/14 (2006.01) E21B 47/08 (2006.01) G01V 1/44 (2006.01)

Patent

CA 2427119

Methods for processing ultrasonic signal data to evaluate subsurface properties and tool orientation. Acoustic signals are transmitted into a plurality of azimuthal borehole positions. Formation echo signal transit time distributions are then determined in a plurality of azimuthal sectors for the acoustic signals. Front face echo signal transit times are also measured and farther-mode and closer-mode transit times are determined for the distribution of formation echo signals. Farther and closer tool standoffs are determined for the azimuthal sectors and a borehole diameter is determined from a summation including standoffs in opposing sectors. The standoffs are also used to determine a preferential tool position.

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