Cameron Clark added 17 points and Jordan Woodard had 15 to lead the Sooners (16-4, 5-2 Big 12).
Ryan Spangler had 10 of Oklahoma's 28 rebounds.
Hield was 4 of 7 from beyond the arc and Cameron was 8 of 12 from the field.
The Sooners got 14 points off Texas Tech's 11 turnovers; the Red Raiders got just three points off Oklahoma's seven turnovers.
Oklahoma never trailed but allowed the Red Raiders to pull within 56-52 late in the second half. But Texas Tech missed four free throws down the stretch that could have made it tighter, while the Sooners hit 5 of their last 6 from the line to seal the win.