Perreault, Corey Perry and Nick Bonino scored power-play goals for the NHL-leading Ducks, who improved to 18-0-2 at home.
Andrew Cogliano scored short-handed during the Ducks' three-goal second period. Ryan Getzlaf and Teemu Selanne added two assists apiece in Anaheim's eighth consecutive win at Honda Center, matching its 8-0 streak to open the season.
That was something I've been dreaming of, something I've told myself before the third period I was going to do ... It was an amazing feeling. It's hard to describe. I didn't believe it went in at first but when I saw all the reaction and all the fans going crazy and my teammates going crazy, it's just an unbelievable feeling. I didn't know what to do. I didn't know whether to jump or just skate and do a Theo Fleury. I don't think I'm the same caliber player he is so I couldn't do it.
— Flames forward Mikael Backlund on scoring the overtime winner against the Ducks in Gm. 3