Oxy: Ecopetrol Declines to Buy Interests in Permian E&P CrownRock / Latest / By mark Following discussions between Permian joint venture partners Occidental Petroleum and Ecopetrol, the Colombian oil company declined to acquire a 30% stake in CrownRock LP’s Midland Basin assets. Share this: Share on Facebook (Opens in new window) Facebook Share on X (Opens in new window) X Related