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The Committed-Catch Gate

Three physical conditions decide the tool before any feature does, and each can rule out a whole family on its own. Answer them in order.

Gate 1 — bore The top has an open, round, reachable bore The bore is packed, collapsed, belled or unreachable

Run an impression block first if you are guessing.

Gate 2 — annular clearance There is room for a grapple to pass around the outside Hole restriction leaves no room to pass a grapple

An overshot has to physically go around the pipe inside the hole.

Gate 3 — commitment A catch that cannot be backed off is acceptable The job needs the option to release and re-set

A conventional die collar cuts thread and stays. That is a commercial decision as much as a technical one.

Answer all three gates to see the routing.

This routes on physical availability only. Fish-top condition, string design and the economic fishing window still apply — and the pipe has to be stationary for any thread-cutting tool to work at all.

Answered but still unsure? Send the top condition and hole restriction and we will confirm the routing →