Reid's 17 all came in the first half. His previous career high was six points, (DePaul).
Duvivier also had five assists in his 36 minutes.
Langston Morris-Walker -- Oregon State's top returning scorer with just four points per game in 2013-14 -- recorded his first career double-double with 11 points and 10 rebounds, both career-highs.
Gary Payton II, a junior college transfer, had six points and nine rebounds for Oregon State. (Dad and Beaver All-American Gary Payton was inducted into the Pro Basketball Hall of Fame last year.)
The Beavs shot 45 percent from the floor and held Rice to 30.8 percent.
The Beavers out-rebounded the Owls 44-27.
Oregon State took a 14-4 lead with 11:44 left in the first half after a layup by Cheikh N'Diaye.
A 3-pointer with about 7 minutes remaining in the half brought the Owls to within three points, 16-13.
But Oregon State then stretched its lead to as many as 12 before going into the half up 32-22.
Rice stormed back, making it 37-35 with 12:36 left before Oregon State put Rice away with a 12-3 run.
New Oregon State coach Wayne Tinkle led Montana to three NCAA Tournament appearances. He inherited an Oregon State squad that went 16-16 last season and lost several key players including scoring machine Roberto Nelson.
Rice finished 7-23 last season and lost its top two scorers, but has three returning starters back this season.