Heavy Machinery & Mining
KEY SEAT WIPER
OPERATION AND APPLICATION TIANHE Key Seat Wiper is made-up just above the top drill collar. It contains a sliding reamer sleeve with an O.D. slightly larger than the drill collar. When coming out of the hole, this sleeve detects the key seat first – instead of the drill collar – by becoming wedged in restricted space. By releasing the drill pipe, the sleeve may be jarred out of the key seat. A clutchdrive on the bottom of the sleeve and the lower body is engaged by right-hand rotation.
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