| 摘要 |
A tool sized for lowering through a tubing string disposed in a well bore by means of a wire line and activated upon exiting from the tubing string for setting a pack-off means to close off the cross-section of the tubing string. The wire line is releasable from the tool so that fluid can be removed from the tubing bore thereby producing a pressure differential across the tool. A sinker bar from the surface is dropped through the tubing string and, upon contact with the tool, actuates the tool to release the pressure differential so that the formations below the tubing string may suddenly produce fluid and thereby be cleaned. At the time of release of the pressure differential, the pack-off means is released so that the tool can subsequently drop from the end of the tubing leaving the tubing bore unrestricted.
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