Global oil prices have surged at market open.... by 19 percent after Saudi Arabia's main oil processing plants were attacked, cutting the country's production by more than half.<br /> As markets opened Monday in Asia, the Singapore Exchange saw benchmark oil futures rise as much as 11 dollars and 73 cents a barrel... to 71 dollars and 95 cents.<br />In Europe, Brent crude oil was trading at almost 68 dollars a barrel, a rise of more than 12 percent.<br />On the New York Mercantile Exchange, West Texas Intermediate, was up by as much as 16 percent to almost 64 dollars. <br />
