Abstract: A tool for locking and releasing a plug in a hydrocarbon well includes a sleeve having at least one pocket for receiving the plug's pin element, and at least one locking element which can be moved between a release position in which the pocket is open, and a locking position in which the pocket is closed. When locking the tool to the plug, the tool is moved in the hydrocarbon well to facilitate positioning of the pin element in abutment with the locking element, further movement bringing the locking element into an open position for receiving the pin element in the pocket, and the locking element is brought into a locking position such that the plug's pin element is locked in the pocket. When releasing the tool from the plug, fluid means are used for movement of the locking element into a release position.

Abstract: A plug includes a slip actuator for setting and release of slips, and a locking element in contact with the slip actuator. The locking element includes multiple parts with internal threads which constitute an enclosure around threads of a pipe. On the radial outer surface of the locking element are provided resilient elements. When setting the plug, the locking element is capable of sliding over the pipe threads for movement of the slip actuator and setting of the slips, until the locking element comes into engagement with a locking sleeve, fixed relative to the pipe, which prevents rotation of the locking element. When releasing the plug, the locking element is released from the locking sleeve, and the locking element rotates off the pipe threads, and the slip actuator follows the movement of the locking element and releases the slips.