Oil prices head for weekly drop on global economic slowdown worries

Oil prices slipped as market participants weighed worries about a global economic slowdown, which would dampen fuel demand, against expectations of tighter supplies toward year-end.  Brent crude futures fell 68 cents, or 0.7%, to $95.91 a barrel by 0658 GMT after settling 3.1% higher on Thursday. U.S. West Texas Intermediate crude was at $89.81 a barrel, down 69 cents, or 0.8%, following a 2.7% increase in the previous session.  Supplies could tighten again when European buyers start seeking alternative supplies to replace 1.2 mbpd of Russian oil ahead of European Union sanctions which take effect from Dec. 5.