| 摘要 |
A method and apparatus for logging the flow characteristics of a downhole interval in a well. The apparatus includes a tool which is lowered in the well to the downhole interval where flow, if any, into the wellbore (e.g., through perforations in the well casing) excites a transducer within the tool. The transducer generates a signal in response to flow having dominant ultrasonic frequency components which, when processed and analyzed, establish whether or not flow is actually occurring in said interval and whether or not said flow contains particulate material, e.g., sand. The tool further includes encoding circuitry for processing the downhole signal and for transmitting same to the surface where it is processed into a usable format by surface decoding circuitry.
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