Oil set for first weekly gain in three weeks
LONDON, Dec 13 (Reuters) - Oil prices rose more than 1% Friday, heading for their first weekly rise since the end of November, as additional sanctions on Russia ratcheted up supply worries, while a surplus outlook weighed on markets.Brent crude futures rose 34 cents, or 0.5%, to $73.75 a barrel by 1308 GMT, while U.S. West Texas Intermediate crude was up 32 cents, also 0.5%, at $70.34.