The oil market is breathtakingly massive, at an estimated $1.7 trillion per year. For perspective, that’s larger than all of the world’s raw-metals markets combined. However, because of the market’s enormous size, there are plenty of opportunities for smaller players to make a mint. Three gems hidden in plain sight because of their smaller size amid the oil market’s behemoths are Centennial Resource Development (NASDAQ: CDEV), Golar LNG (NASDAQ: GLNG), and NOW Inc. (NYSE: DNOW).