An oil well pump jack is seen at an oil field supply yard near Denver Published November 15, 2017 at 780 × 518 in Giá dầu hôm nay 7/11 tăng nhẹ do các nhà đầu tư “bắt đáy” mua vào An oil well pump jack is seen at an oil field supply yard near Denver, Colorado, U.S., February 2, 2015. REUTERS/Rick Wilking/File Photo ← Previous