| 摘要 |
An apparatus and method of visually examining the sidewalls of a bore hole include a down hole video tool lowered into the bore hole by means of a cable and winch on the surface. The apparatus includes a wide angle end video camera positioned at the tip of a lower section and a rotatable side scan video camera mounted inboard from the end video camera. The end video provides a panorama view of a portion of the bore hole, and the side scan video camera provides a detailed close-up 360 degree view of a portion of the bore hole. An upper section houses a power supply/triplexer, a telemetry board, an FM modulator video amplifier transmission board, gyroscope data interface board, and a gyroscope for showing the directional orientation of either camera and apparatus in the bore hole. The gyroscope orientation and the visual image of the portion of the sidewall viewed is transmitted to a video display monitor in an equipment van on the surface. The image on the screen includes a directional reference point so that the direction of a portion of the sidewall being viewed can be ascertained. The camera images are recorded by a video cassette recorder for a permanent record of the visualization of the entire length of the bore hole. The tool is used to inspect exploratory bore holes, or bore holes previously encased by steel tubing to detect any leaks or other deterioration in the tubing system.
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