By Stephanie Kelly and Marcy de Luna NEW YORK (Reuters) -Oil prices surged to fresh seven-year highs on Friday, heading for a seventh straight weekly increase, built on ongoing worries about supply disruptions fueled by frigid U.S. weather and ongoing political turmoil among major world producers. Brent crude rose $2.38 , or 2.6%, to $93.49 a barrel, by 1:40 p.m. EST (1840 GMT), having earlier touched its highest since October 2014 at $93.70. U.S. West Texas Intermediate crude was $2.48, or 2.8%, higher to $92.75 a barrel, after trading as high as $93.17, its highest since September 2014. Both…