 Petry improved in his second NHL season, leading all Oilers defensemen in points, with 25, and was trusted into a shutdown role alongside Ladislav Šmíd.At the end of the 2011–12 season, on June 7, 2012, Petry re-signed on a two-year, $3.4 million contract with the Oilers.At the start of the 2011–12 season, Petry made Edmonton's NHL roster out of training camp and subsequently played three regular season games before being assigned to Oklahoma City.