E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
E21B 49/00 (2006.01) E21B 47/00 (2006.01) G01V 1/22 (2006.01) G01V 1/44 (2006.01)
Patent
CA 2157824
A sonic well logging tool radially determines circumferential placement of cement longitudinally along exterior surfaces of a well casing. The sonic well logging tool includes a frequency shifting modulator for shifting the frequency of high frequency electrical signals to provide analog data signals having substantially lower frequencies. The analog data signals have waveform shapes which directly correspond to time stretching the shapes of waveforms for the high frequency electrical signals representing high frequency sonic signals. The high frequency electrical signals are frequency shifted to substantially lower frequencies which can be transmitted uphole over a wireline. The sonic well logging tool further includes high frequency sonic transducers which do not extend in a particular direction for substantially more than one quarter of a sonic waveform length of the high frequency sonic signals travelling in the particular direction within a sector of casing.
Alford Gerald T.
Blankinship Thomas J.
Tello Lucio N.
Kirby Eades Gale Baker
Precision Energy Services Inc.
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