| 摘要 |
Leaks in underground conduit, such as vertical drill pipe in wells or underground pipelines, are located by closing one end of a segment of the conduit and then pumping a plug into the pipeline. As long as fluid is escaping from the conduit through the leak, the plug will move, but when the plug passes the leak, the plug will no longer move because of the fluid trapped between the plug and the closure. Then the plug can be located by a wire line attached to the plug. If the plug is to be retrieved by pulling the plug, a passageway through the plug is opened to prevent swabbing the conduit when retrieving the plug.
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