HOUSTON, Aug 5 (Reuters) - Chevron ( CVX ) and Valero

Energy ( VLO ) are working to resume a supply agreement of

Venezuelan crude to be refined in the United States, three

sources close to the preparations said on Tuesday, following a

new license granted to the U.S. oil major.

In the first quarter, before Chevron's ( CVX ) license to operate in

Venezuela was revoked, Chevron's ( CVX ) supply of Venezuelan heavy

crude to Valero's refineries from a ship-to-ship operation off

the Caribbean island of Aruba secured some 50,000 barrels per

day (bpd) to the refiner, according to shipping data.

(Reporting by Marianna Parraga and Arathy Somasekhar)