Method and apparatus for measuring wellbore diameter using...

Details Method and apparatus for measuring wellbore diameter using... Method and apparatus for measuring wellbore diameter using...

G - Physics

01

V

324/9

G01V 3/30 (2006.01) E21B 47/08 (2006.01)

Patent

CA 2011390

METHOD AND APPARATUS FOR MEASURING WELLBORE DIAMETER USING ELECTROMAGNETIC WAVES ABSTRACT A method is proposed for determining the distance from an investigating device to the surface of a medium capable of supporting wave propagation. Ac- cording to the method, a propagatory wave is generated at a given location along the surface of said medium and spaced laterally therefrom. The propaga- tory wave is caused to enter the medium and to propagate in the medium. The phase of the propagating signal is detected at a pair of locations respectively spaced longitudinally along the surface of the medium by different distances from the transmitting location. An indication of the lateral spacing between the detecting means and the medium is determined in response to the phase information detected at the pair of locations.

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