SINGAPORE (Reuters) - Oil prices dipped on Thursday after sharp gains in the previous session following a surprise draw in U.S. crude inventories, with concerns over a weak demand outlook adding to downward pressure.Brent crude futures fell 33 cents, or 0.5%, to $60.84 a barrel by 0335 GMT. The international benchmark crude rose 2.5% on Wednesday to settle at $61.17 a barrel, levels not seen since Sept. 30. West Texas Intermediate (WTI) crude futures dropped 44 cents, or 0.8%, to $55.53 per..