Empresas operadoras Ente Nazionali Idrocarburi http://www.eni.it Britihs Petroleum http://www.bp.com Shell http://www.shell.com Repsol-YPF http://www.repsol.com Exxon -Mobil http://www.exxon.com Qatar General Petroleum Corporation http://www.qp.com.qa Petroleos de Venezuela SA http://www.pdvsa.com Empresa Nacional de Petróleo http://www.enap.cl Occidental Petroleum Corp. http://www.oxy.com Sonatrach http://www.sonatrach-dz.com Pertamina http://www.pertamina.com Kuwait Petroleum Corporation http://www.kpc.com.kw Saudi Aramco http://www.saudiaramco.com Abu Dhabi National Oil Company http://www.adnoc.com Petroecuador http://www.petroecuador.com.co Ecopetrol S.A. http://www.ecopetrol.com.co