The rebound in the price of crude this year has lifted upstream and downstream players across the entire oil patch. Investors seeking to drill down on a single stock in the energy sector should consider the highly integrated Royal Dutch Shell ( RDS.A) , said Andrew McNair, CEO of Swan Capital. 'They can really take advantage of not just the production of oil, but they also cut out the middle-man when they sell the oil,' said McNair. 'Now that oil has rebounded, it may be somewhat volatile, but we see it as a good buy.' Shares of Royal Dutch are up 7.5 percent year-to-date, but are still down over 11 percent over the past 12 months.