C172 ACFT CONDUCTING EXTENSIVE TFC WATCH FLYING. PLT RPTR HAD FLOWN MANY HRS AND LONG DUTY DAYS FOR 2 DAYS AND WAS FATIGUED. LNDG AT ARPT TWR CLRED FOR LNDG RWY 31R; TWR CTLR REQUESTED RPTR MAKE A DIRECT BASE AND RPTR LANDED ON RWY 31L.

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I HAD BEEN FLYING TFC WATCH FOR THE CAR RACES SAT AND SUN 8.6 HRS. EACH DAY WE HAD A 2 HR BREAK AT LOVE. AFTER THE LAST MISSION ON SUN I RETURNED TO LOVE TO DROP OFF MY R SEATER. DALLAS LOVE CLRED ME FOR THE R RWY 31R WITH L TFC; BEFORE MAKING IT TO L TFC THEY ASKED ME TO MAKE A DIRECT L BASE FOR THE R. I PUSHED THE NOSE DOWN MADE THE BASE AND A FULL STOP ON RWY 31L. WRONG RWY. I HAVE NO IDEA WHEN I TURNED; I MADE A PERFECT LNDG AND MADE THE FIRST TURN OFF. NO OTHER TFC WAS NEAR. THE TWR NEVER EVEN SAW ME. I DIDN'T KNOW I HAD SCREWED UP UNTIL I CALLED CLR AT TXWY C REQUEST TAXI. DALLAS GND CTLR ON 121.75 ASKED WHAT I WAS DOING OVER THERE. I REPLIED I'M GOING TO DALLAS. HE SAID YOU'RE ON RWY 31L. I HAVE NO IDEA. THEY CLRED ME TO TAXI AND SAID NOT A PROB. I'VE FLOWN OVER 440 HRS IN THE LAST 6 MONTHS. ALMOST ALL OF THEM HAVE BEEN TFC WATCH IN FT WORTH AND DALLAS. I WORK OUT OF LOVE FIELD ALMOST EVERY DAY WITH THE SAME PEOPLE AND FLY THE SAME AIRPLANE. I THINK THAT'S WHY THEY DIDN'T GET MAD. THE REASON FOR MY SCREW UP: TOO MUCH FLYING; SPLIT SHIFT; TOO TIRED; JUST PLAIN WORN OUT.