Oil futures climbed more than $1 a barrel on Monday, after Saudi Arabia raised prices for crude sales to Asia for a second month, signaling better demand in the region. International benchmark Brent regained ground after tumbling as much as 5 percent on Thursday, when a preliminary nuclear deal was finally reached between world powers and Iran. Brent crude for May delivery (LCOc1) touched a high of $56.06 a barrel and was up 80 cents from Thursday at $55.75 by 1.10 a.m. EDT.