The oil and gas sector is a complex system with lots of moving parts.  So when drilling projections for 2013 anticipate a slowdown, different industries within the sector could move in opposite directions. In this video, Motley Fool contributor Tyler Crowe breaks down which industries will continue to do well and which ones will get hurt.  Investors will want to keep an eye on equipment and services companies, because this could affect them the most. One company in this space that has a lot at stake is Heckmann (NYSE:NESC). Will the slowdown across the U.S. take the company's fortunes with it? 
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