Abstract: Field A in southern Bohai Sea is located at the region’s export hub and is responsible for transporting crude oil from all fields in the region and parts of Western Bohai Sea to terminal processing plants. The oil field is equipped with six export pumps,but the production of the new oil field,the measures of the old oil field and tapping the potential of the oil field make the pressure of crude oil transportation increase continuously,which seriously restricts the crude oil production in the whole region. In this case,through a series of studies and tests,drag reducer was injected into the crude oil transportation pipeline of oil field A,and the injection method of drag reducer was optimized and improved, which effectively increased the crude oil transportation volume under the same pipeline pressure,alleviated the transportation pressure,and it ensured the stability of oil transportation. It has certain reference significance for oil transportation of offshore oil fields.

Key words: hub oilfield, crude oil transportation, drag reducer