Abstract: Apparatus for attaching a downhole isolation, production, or testing tool is disclosed, such that the tool is mechanically attached to a mandrel in a manner that is highly resistant to axial movement. In general, the connection includes at least one groove or channel cut in an outer wall of the casing mandrel, and at least one partially or fully annular slot on the inside surface of the tool oriented to correspond with the groove(s) in the outer wall of the casing mandrel. At least one lock is situated in the corresponding slot and the groove. The lock engages the flanks of the slot and groove sufficiently to resist shear loads applied by compression or tension in the string. In one embodiment, the lock is one or more wires, although other mechanical locking devices may be installed to provide the same function.

Abstract: Apparatus for attaching a downhole isolation, production, or testing tool is disclosed, such that the tool is mechanically attached to a mandrel in a manner that is highly resistant to axial movement. The mechanical connection resists high temperatures, high pressures, and corrosive fluids and gases that may be encountered in the well without the use of welding to a casing mandrel. In general, the connection includes at least one groove or channel cut in an outer wall of the casing mandrel, and at least one partially or fully annular slot on the inside surface of the tool oriented to correspond with the groove(s) in the outer wall of the casing mandrel.