OAO LUKOIL President Vagit Alekperov and Bulgaria’s Prime Minister Boyko Borissov attended the ceremonial opening, in Burgas today, of a complex to process heavy residues on the territory of the LUKOIL Neftochim Burgas Refinery. The new facility consists of the main unit to hydrocrack sludge, with an annual capacity of 2.5 million tons, and of a number of auxiliary units.