Casing Window Assembly

A casing window assembly, comprising:

• a tubular casing sleeve having an inside diameter, an outside diameter and an opening between the inside diameter and the outside diameter forming a casing window;
• a mandrel having an upper end and a lower end, at least one of the upper end of the mandrel and the lower end of the mandrel including an expandable stop and orienting-key;
• and
• an orienting member secured within the casing sleeve below the casing window, the orienting member including a plurality of guiding elements separated by a plurality of slots, the plurality of slots including an orienting slot that directs the mandrel to a lateral position that is substantially the same as a lateral position of the casing window and that permits the mandrel to be lowered to a depth that is substantially the same as a depth of the casing window.