Oil Price Rises as Kazakh Turmoil Adds to Supply Worries

Oil tankers are seen parked at a yard outside a fuel depot on the outskirts of Kolkata, on Feb. 3, 2015. Rupak De Chowdhuri/Reuters

LONDON—Oil prices rose and were heading for their biggest weekly gains since mid-December on Friday as unrest in Kazakhstan and outages in Libya fuelled concerns over supply.

Brent crude climbed 76 cents, or 0.9 percent, to $82.75 a barrel at 0939 GMT. U.S. West Texas Intermediate (WTI) crude rose 77 cents, or 1 percent, to $80.23 a barrel.