Oil prices slipped in the international market on Friday, stressed by a Reuters survey showing slow global economic growth, however, the losses were checked by tensions in the Middle East. Brent crude futures were priced 0.4% lower, at $63.15 a barrel. US WTI crude was down 0.1%, to $55.97 a barrel. A Reuters poll conducted over 500 economists showed deepening risks of a global economic growth slowdown.