Royal Dutch Shell is set to complete the construction of the world’s largest gas to liquids (GTL) plant in Qatar by the end of this year, with full capacity expected by early 2012, Reuters has reported. The $18bn-$19bn Pearl project is to have a capacity of 140,000 barrels per day (bpd) of GTL products which include diesel, kerosene, naphtha and lubricant oils. Pearl, a joint development by Qatar Petroleum and Shell, will process about three billion barrels-of-oil-equivalent over its lifetime from the huge North Field in the Gulf.