Abstract
A personal computer based hardware has been developed for the real time, rapid digitization of echo amplitudes and times-of-flight of ultrasonic pulses produced by existing analog ultrasonic borehole imaging systems. Both amplitude and travel-time B-scan images are mapped circumferentially around the wellbore wall with reference to magnetic north. 12-bit analog to digital conversion of pulse amplitudes provides a resolution of approximately 1 mV out of a peak amplitude voltage of 1 V; travel times are determined to within 100 ns to a maximum time of 512 μs after which it is assumed that no signal will be detected. This information provides high-resolution digital images of the borehole wall and cross section which are useful for delineation of open fractures, discrimination of complex cross sections, and calculation of wellbore volumes.
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