Latham & Watkins, White & Case and Clifford Chance have picked up roles on the sale of a stake in a newly-formed Saudi Aramco crude oil network in a deal worth $12.4 billion.

Latham is advising U.S. energy and infrastructure investment firm EIG, which is acquiring a 49% equity stake in Aramco Oil Pipelines, giving it an equity valuation of $25.3 billion, according to a statement from EIG. The pipelines company is a consortium with rights to 25 years of rate payments for oil shipped through Aramco’s network of conduits.