Oil prices gained slightly on Thursday, rebounding from two days of declines, as a larger-than-expected draw in U.S. crude inventories provided some impetus for investors to buy futures while they monitor developments in Venezuela. Brent crude futures climbed 38 cents, or 0.6%, to $60.34 a barrel by 0104 GMT, while U.S. West Texas Intermediate crude was at $56.36 a barrel, up 37 cents, or 0.7%.