| 摘要 |
A releasable boring mechanism for releasably securing a tool downhole in a well includes upper and lower sets of slip expandable radially outward from retracted positions into extended positions for engagement with the inside wall of a well casing when a mandrel attached to a tubing string casing, the anchoring mechanism is lifted to wedge upper and lower frustoconical heads between the mandrel and the slips. In releasing the slips from the well casing, the lower edge of a window in an upper slip cage first engages a primary release shoulder on the bottom of a first to release one of the slips to lift such slip through the application of compression forces from the casing well.
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