Chevron, Halliubrton, Sunoco drag energy stocks

stocks fell on Friday on weakness in shares of Halliburton /quotes/comstock/13*!hal/quotes/nls/hal (HAL 31.14, -0.54, -1.70%) , Sunoco /quotes/comstock/13*!sun/quotes/nls/sun (SUN 37.35, -2.37, -5.97%) and Chevron /quotes/comstock/13*!cvx/quotes/nls/cvx...