Field_DevelopmentPetrobras eyes Colombia exit with offshore block stake up for salePetrobras continues retrenchment toward prime Brazilian pre-salt assets by putting stake in Colombia's Tayrona block up for saleTayrona wells: Petrobras used the Diamond Offshore drillship Ocean Clipper to drill the Orca-1 well in Colombia's Tayrona blockPhoto: DIAMOND OFFSHOREGareth ChetwyndLondon