Energy stocks were lower pre-bell Tuesday, with the Energy Select Sector SPDR Fund (XLE) 0.1% down recently.

The United States Oil Fund (USO) was 0.8% lower and the United States Natural Gas Fund (UNG) was down 1.9%.

Front-month US West Texas Intermediate crude oil was 1% lower at $65.29 per barrel at the New York Mercantile Exchange. Global benchmark North Sea Brent crude oil lost 1% to $68.56 per barrel, and natural gas futures were 2.7% lower at $3.23 per 1 million British Thermal Units.

Halliburton (HAL) shares were down more than 2% after the company reported lower Q2 adjusted earnings and revenue.

Amplify Energy (AMPY) shares were up more than 2% after the company said it has engaged TenOaks Energy Advisors to explore potential buyers for its assets in East Texas and Oklahoma.

BP's (BP) chartered tanker has left a port run by Indian refiner Nayara Energy without loading, Reuters reported, citing five industry sources and shipping data from the London Stock Exchange Group. Shares of BP were 0.7% higher premarket.