China’s beleaguered oil sector could face fresh challenges following Donald Trump’s election as president , with some in the industry warning that a harder U.S. line toward China could stymie potential investment in the U.S. energy patch. State-owned giants such as PetroChina Co. and China Petroleum & Chemical Corp. long viewed the U.S. as the golden egg of their global deal making ambitions, with its huge oil-and-gas reserves and a stable regulatory and political climate. Now Mr. Trump’s election is brewing new uncertainty in the energy patch as experts see an inherent contradiction between Mr. Trump’s pledge to promote oil-and-gas drilling and his campaign rhetoric decrying globalization. “Nobody knows what he’ll do,” said a person with ties to China’s top oil executives who has promoted the idea of more Chinese energy investment in the U.S. An attorney who works with Chinese energy clients and others across Asia said he […]