Whipstock sidetracking is a drilling technique used to deviate a wellbore from its original path. This is often done inside a cased hole when the original well path becomes nonviable due to geological conditions, equipment failure, or the need to access untapped reserves. The whipstock—a wedge-shaped steel tool—is set in the casing to guide the drill bit in a new direction. https://progrynd.com/casedhole-whipstock/