Abstract: A perforator to increase conductivity of a deposit bearing region of oil, gas, and/or water saturating a rock formation having a wellbore hole therethrough and, thus, increase production by cutting elongated openings (slots) through casing, cement bond and formation rock. The perforator is attached to the bottom end of a string of drill pipes. The string of drill pipes are connected to a surface raising and lowering device for raising and lowering the string of drill pipes into a wellbore hole. A pump pumps an abrasive liquid into the perforator through the string of drill pipes. The perforator has telescoping nozzles and double jet nozzles. The abrasive liquid is jetted at a high velocity out of the telescoping jet nozzles and the double jet nozzles. By shifting the perforator with the raising and lowering device while pumping the abrasive liquid into the perforator, slots are cut in the casing, cement bond and formation rock along wellbore axis.