 Four years after Port Arthur underwent its $10 billion expansion, making the facility the biggest producer of gasoline, diesel and other petroleum products in the United States, Saudi Arabia-based Saudi Aramco is poised to become the sole owner of the facility.News organizations reported that Shell and Aramco's joint business venture began to unravel shortly after the multi-billion dollar facility expansion.Reports state that the subsequent increase in operating costs and the 2015 workers strike damaged relations between these oil giants beyond repair.