Subterranean Tool for Release of Darts Adjacent Their Intended Destinations

摘要

A subterranean tool can drop multiple objects to landing locations in a tubular string. The tool can keep at least one ball out of the fluid stream until ready for release. A dart or wiper plug can be kept in the fluid stream with an open bypass until axial mandrel movement allows release of the plug or dart. The tool is rotationally locked at a lower location for run in and then can rotationally lock at an upper location upon release of the dart or ball. Axial movement that releases the dart can continue until the ball aligns with a decreasing depth groove so that relative part rotation cams the ball against a leaf spring detent and into the mandrel flow path.

主权项

1. A tool for selective release of at least one object from a subterranean location to an adjacent location where said object lands to perform a borehole operation, comprising:
an outer housing with opposed connections for attachment to a tubular string and disposition at a predetermined subterranean location; a mandrel having a passage therethrough and movably mounted with respect to said outer housing, said mandrel having spaced wall openings defining a bypass flow passage around at least one selectively retained object in said passage; said object initially supported in said passage and selectively released to travel to the adjacent location; said mandrel extending outside said housing through said tubular string for remote actuation of said mandrel to release said object to move through said passage.