WTI discounts are $6 to $7 a barrel, increasing pressure on producers to shut in wells.
Shipment comes as China returns to work and increases its demand for power.
Analysts estimate the global glut of crude could reach 1 billion barrels.
Freight charges from the Middle East to China doubled overnight.
Familiar challenges remain, but growing export markets buoy the midstream.
Over the past couple of months, Singaporean gas importer Pavilion Energy canceled the loading of a U.S. LNG cargo and some Chinese companies were offering to resell cargoes.