Patent ID: 6945325

Claim:
A downhole assembly for a well, comprising in combination: a wellhead housing having an axial bore with an upward facing shoulder; a wear bushing including a tubular member having an axial bore with an internal recess; a plurality of radially movable running-in keys mounted in the wear bushing, the running-in keys being movably biased to protrude into the axial bore; a tool having threaded upper and lower ends for securing into a drill string; a plurality of support ridges on the tool, the support ridges being spaced circumferentially apart from each other; wherein the wear bushing is secured to the tool by rotating the tool and wear bushing relative to each other as necessary to align the support ridges with the keys, enabling the tool to support the wear bushing until the wear bushing lands on the shoulder, and wherein the wear bushing is released from the tool by rotating the tool relative to the wear bushing to disengage the support ridges from the keys, enabling the drill string to be lowered further into the well.