ABSTRACT OF THE DISCLOSUREWell tools for running and setting a well safety valueincluding a lock mandrel for releasably locking the valve at ano-go landing nipple in a well bore and a running tool forrunning and setting the lock mandrel. The lock mandrel includesa body provided with a no-go ring, locking dogs on the body,and an expander sleeve movable upwardly in the body for expand-ing and locking the dogs. The running tool includes a tubularcore having an end engageable with an operating tube of thesafety valve, an upper latch key assembly for engaging thelock mandrel housing to couple the running tool on the lockmandrel, a lower collet assembly for operating the expandersleeve of the lock mandrel to expand the locking dogs, and ahead for connecting the running tool in a wireline tool string.The running tool has locking features which apply a force froma spring of the safety valve to the latch keys to lock therunning tool in the lock mandrel. A safety valve is connectedon the lock mandrel which is coupled on the running tool. Theassembly is lowered in a well to a no-go nipple. A controlfluid pressure to the safety valve relieves the spring forcefrom the running tool core and the running tool is pulled up-wardly expanding the lock mandrel dogs and releasing the runningtool from the lock mandrel.
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