A woman wearing a face mask walks on the ocean front while oil tankers are seen anchored off the coast of Long Beach, California, after sunset on April 25, 2020.

Oil prices dipped on Friday due to demand worries over coronavirus variants and slow vaccine rollouts, which offset a bullish sentiment due to a cut in Saudi Arabian oil supply and falling U.S. oil inventories.

"The vaccine numbers are just not there," said Bob Yawger, director of energy futures at Mizuho in New York. Additionally, he said a U.S. economic stimulus package may not come quickly enough to support the market.