EE WAS DRILLING. HE TURNED UP SETTINGS ON COMPRESSOR. APPROX 5 MIN AFTER TURNING UP THE PRESSURE, HOSE CARRYING AN AIR/OIL MIXTURE BLEW. HOSE WAS NEXT TO COOLING FAN WHICH BLEW THE MIXTURE INTO THE TURBO ON THE ENGINE & MIXTURE IGNITED. HE LOOSENED HARD HAT & RECEIVED 2ND DEG BURNS ON HIS HEAD. HE THEN PUT THE FIRE OUT W/THE EXTINGUISHER IN THE RIG. FIRE LASTED 3-4 MIN.