| 摘要 |
A direct acting slug and wipe tool for use in drill pipe in drilling operations effects a cleaning operation by placing a rib inflated bladder in contact with the inside surface of a drill pipe in connection with a free floating pneumatic chamber. The inflatable bladder is toroidal and circumferentially disposed about and communicates with a sealed and closed chamber filled with a fixed amount or mass of gas. Weights may be added to the wiper in order to fix its equilibrium floating position. The wiper with the inflatable bladder is able to wipe the interior of the drill pipe even through those portions having a reduced inner diameter, such as at the drill pipe joints. Thus, as the drill pipe is tripped, the slug and wipe tool is longitudinally displaced with respect to the drill pipe through a plurality of drill pipe sections. In a second embodiment, a plurality or pair of intercommunicating ribbed inflatable bladders are circumferentially attached to the sealed and closed chamber thereby allowing one bladder to expand in a portion of the drill pipe having a normal sized diameter as the other bladder is simultaneously compressed when passing through a restricted diameter.
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