| 摘要 |
A method and apparatus for remotely monitoring the position of a subsurface tool or piece of equipment (14), uses the step of detecting acoustic emissions from the tool or equipment, the emissions preferably being transmitted through an acoustic transmission medium (tubing string, drill string (12), casing string, wireline or the like), to which the tool or equipment is attached. Detection may be by a transducer in monitoring equipment (26) temporarily or permanently attached to the transmission medium (12). A motion or position to noise transducer (32) can be incorporated into the tool or equipment (14), to generate the acoustic emissions characteristic of the tool or device conditions of interest, where these are not inherently generated by use of the tool/equipment. The characteristic acoustic emissions may be processed, counted and displayed to a user. The signal from the transducer may also be supplied to a data logger.
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