Baghdad July 12 (Reuters) - Iraqi Prime Minister Ali al-Zaidi will travel to Washington on Monday at the head of an official delegation after an official invitation, government spokesperson Haider al-Aboudi said in a press conference on Sunday. "The agreements to be signed will include several memorandums of understanding in the oil and gas sector as Iraq prepares to bring in various U.S. companies that will provide momentum to increase oil production capacity," al-Aboudi said. (Reporting by…