By Erwin Seba HOUSTON (Reuters) -Oil prices dropped on Friday as worries about large supplies and declining demand outweighed expectations that the year's first interest-rate cut by the U.S. Federal Reserve would trigger more consumption. Brent crude futures settled at $66.68 a barrel, down 76 cents or 1.1$62.68, down 89 cents or 1.4%. Both benchmarks rose for a second consecutive week. "Oil supplies continue to remain robust and OPEC is reducing its ...