Setting tool

摘要

A setting tool of the type adapted to be made up in a pipe string for releasably engaging a setting sleeve in a well bore is shown which has a mandrel having an upper end adapted to be connected in the pipe string and having a lower end. A setting nut carried on the mandrel has external connecting threads for engaging mating connecting threads located on the interior of a setting sleeve disposed about the lower end of the mandrel. The mandrel is slidably disposed within the setting means when the setting means is engaging the setting sleeve. The mandrel is slidable between an extended running-in position and a weight-set down position. Dogs are provided in the setting nut for engaging a radial groove in the setting sleeve when the mandrel is in the running-in position to prevent relative movement between the setting nut and the setting sleeve which would disengage the tool. Setting weight down on the tool causes an undercut area on the mandrel to underlie the dogs in the setting nut thereby allowing the dogs to be disengaged from the setting sleeve groove which in turn allows relative movement between the setting nut connecting threads and the connecting threads of the setting sleeve to disengage the tool. The setting nut connecting threads can be right hand release threads, whereby the setting tool is releasable from the setting sleeve by right hand rotation of the mandrel when the mandrel is in the weight set-down position.