US Patent 11326442 Orientation verification devices

An orientation verification tool permits an operator to confirm an orientation of one or more perforating charges in a perforating gun assembly when the perforating charges are not readily visible for inspection. The orientation verification tool includes an end fixture rotationally coupled at a longitudinal end of a charge carrier disposed within a tubular gun body. The end fixture includes a visual indicator of the orientation of the perforating charges on a longitudinal end face thereof. The visual indicator may include a plurality of hatch marks arranged at regular intervals around the end fixture, and each hatch mark may be identified by a specific angular identifier so that the hatch mark located at a reading location will identify the angular orientation of the perforating charges.