Numaligarh Refinery Limited (NRL) has executed one of the longest Horizontal Directional Drilling (HDD) in Subansiri River, connecting Lakhimpur and Majuli in Assam, for its crude oil pipeline project. NRL is executing the mega project of laying 1,635km pipeline from Paradip Port in Odisha to Numaligarh in Assam along with expansion of its refinery from 3.0 MMTPA to 9.0 MMTPA, as part of ‘Numaligarh Refinery Expansion Project (NREP)’, an official release said here on Friday.