Abstract: An apparatus and method for perforating a well casing. The apparatus includes a drilling mechanism comprising an air-operated drill mounted between forward and rear frame members, a drill bit connected to the air drill and extending from the forward frame member, an inflatable bladder mounted on the back of the rear frame member, and plural coil springs mounted along the front of the forward frame member. The air drill and bladder are connected to an air compressor which drives the air drill and also inflates the bladder to push the drill bit into the portion of the well casing to be perforated and at the same time causes the coil springs to compress between the forward frame member and the well casing. When the drilling of each perforation is completed, a vacuum source evacuates the air from within the bladder, and the coil springs then push the forward frame member away from the well casing so that the drill bit is withdrawn from the perforation.