Plains All American Pipeline LP’s 585,000 barrel-per-day (bbl/d) Cactus II oil pipeline from the Permian Basin to the Corpus Christi, Texas, area will commence line fill within a week, a source with direct knowledge of the matter said on June 27.

Line fill refers to the process of filling oil in a new pipeline before commercial deliveries can begin.

Plains did not immediately respond to requests for comment.

Once line fill is complete, commodities merchant Trafigura, one of the largest shippers on the line, will be shipping full contractual volumes, the source said.

Trafigura signed a long-term agreement with Plains last year to transport a total of 300,000 bbl/d of crude and condensate on the Cactus II pipeline from the Permian Basin, the biggest oil field in the U.S., to the port of Corpus Christi.

The trading house is one of the biggest exporters of U.S. crude and the deal with Plains will allow it deliver crude to U.S. Gulf Coast refiners, ship the oil to its condensate splitters and export terminal in Corpus Christi, which it co-owns with Buckeye Partners L.P.

Pipeline takeaway constraints had slowed production growth and weighed on oil prices in the Permian basin but midstream companies have announced several new projects, such as Cactus II, to help clear the transportation bottleneck.

A shale boom has helped propel the United States to the position of the biggest oil producer in the world and the Permian basin has accounted for a large part of output growth in recent years.

Exports of U.S. crude have surged to a record at nearly 4 million bbl/d after Washington lifted a ban in late 2015.

Onshore