| 摘要 |
Apparatus and method for orienting a collar on a fluid conducting conduit, such as a drill string, includes an orifice through the wall of the conduit and a latch assembly for latching the collar to the conduit. The latch assembly allows fluid communication through the orifice and rotates the collar when the conduit is rotated in a first direction about the longitudinal axis of the conduit. The latch assembly unlatches the collar from the conduit, prevents fluid communication through the orifice, and allows the conduit to rotate relative to the collar when the conduit is rotated ion a second, opposite direction. Also included are apparatus and method for rotationally orienting a fluid conducting conduit including an insert connectable inside the conduit so that the insert is rotatable with the conduit; a flow passageway extending through the insert; a pilot passageway extending through the insert; a piston bore in the insert; a piston, reciprocably mounted in the piston bore, for reciprocating between the ends of the piston bore, the piston restricting flow through the flow passageway and creating a fluid pressure increase on the upstream side of the insert when the piston is in a restricted position in the piston bore; and a barrier mass for blocking the pilot passageway in a selected rotational position of the pilot passageway and conduit in order to increase the fluid pressure at the downstream end of the piston bore and move the piston to the restricted position in the piston bore.
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