Abstract: An automated system for identifying an optimal re-drilling trajectory to reach a target using a previously drilled well is described. It creates substantial advantages in the time and cost saving that result from increasing drilling efficiency. In one embodiment, the invention is a system for identifying an optimal well path to reach a target using a previously drilled well. The system includes an input device for receiving information from a user, and a server receives information from the input device. An automated re-drilling software program is provided for identifying an optimal well path to reach a target using a previously drilled well and performs several steps. A plurality of well paths for reaching the target is identified. The software automatically identifies a subset of the plurality of well paths that satisfy selected criteria, and at least one of the subset of well paths is designated as the optimal well path.