The fascinating thing about investing in the oil sector is how many stocks in the space are directly influenced by oil prices. In other words, historically speaking, they tend to follow the direction of the price of oil. That’s a consideration that springs to mind when looking at Halliburton‘s (NYSE: HAL) latest set of earnings. The price of oil is now above $80 a barrel, and the oil services company’s management gave a very bullish outlook for the industry. Is now the time to buy?