(Reuters) – Colombia’s Ecopetrol (ECO.CN), opens new tab is in talks with U.S. oil producer Occidental Petroleum (OXY.N), opens new tab to possibly buy a 30% stake in shale oil producer CrownRock, in a transaction potentially worth $3.6 billion, the North American company said on Friday. Ecopetrol, Colombia’s majority state-owned energy company, said it … Read more