Aspen Technology, Inc., a global leader in asset optimization software, today announced that Ecopetrol, the largest petroleum company in Colombia, has selected Aspen GDOT™ dynamic optimization software as part of its digitalization initiative to improve refining margins at its two refineries in Cartagena and Barrancabermeja, and upgrading to Aspen DMC3™ advanced process control software in Barrancabermeja refinery.