A well penetrator (48) consists of a number of hydraulic fluid control components (54) and a carriage (250) carrying a hydraulic motor (270) and a mill bit (268) supported in a housing (74) which is moveable down a well casing (42). The control components (54) cause the carriage (250) carrying the mill bit (268) to be indexed up a predetermined distance relative to the well casing (42) and then extended gradually into contact with the well casing (42) while being rotated by the hydraulic motor (270). After the mill bit (268) completes a hole through the well casing (42), the hydraulic components (54) index the mill bit (268) back down to its starting position and align a nozzle (N) on the outer end of a high pressure lance (L) with the opening in the casing (42) to direct fluid from the nozzle (N) as the lance (L) is moved outwardly through the hole in the casing (42) drilled by the mill bit (268).
