Canadian Natural Resources (NYSE: CNQ , TSX: CNQ:CA ) is an E&P that, I believe, should be considered for a core position in every energy portfolio. The company has a massive, low-cost reserve base with low maintenance capitalEnergess Resources provides the perspective of a petroleum engineer with over 15 of experience in oil and gas operations, primarily as a production engineer and field-level supervisor. The author has experience in multiple asset types including multiple shale basins, offshore deepwater ...