When the refinery re-opens, it will have the capacity to process around 165,000 barrels per day, reports Reuters.

Ecopetrol downstream operations executive vice-president Pedro Alfonso Rosales was quoted by the publication as saying that the refinery will be adapted to process the heavier crudes, which are produced in Colombia.

"Really we expect it to be between the end of April and May but the most certain is that in May it will be restarted," Rosales told Reuters on the sidelines of the Colombia Oil & Gas conference in the coastal city where the refinery is situated.

In March 2013, the crude distillation unit of the refinery has been shut down, while cracking unit was taken off line in 2013.

The logistics and distribution of imported fuels were the only operations currently taking place at the plant, according to Rosales.