Canadian Natural says oil curtailments work, despite rivals' complaints

CALGARY -- Alberta's crude curtailment plan is working so well to support western Canadian oil prices that it won't likely be needed for too much longer, say executives at Canadian Natural Resources Ltd. Furthermore, the profitability of crude-by-rail shipments to the U.S. Gulf Coast is intact and will encourage more export capacity growth, they added on Thursday. "The Canadian oil market was very rocky in the fourth quarter with dysfunctional marketplace dynamics driving historically high diffe