Investing.com – Oil edged higher Friday, but was on track for weekly losses of around 2.5% that kept it near six-month lows. U.S. crude was up 30 cents, or 0.7%, at $44.76 at 7:15AM ET, while {{Brent oil}} gained 59 cents, or 1.3%, to $47.51. Friday’s slight gains were chalked up to a partial export halt in Libya. Oil prices were still down around 13% since late May when OPEC and non-OPEC producers agreed to extend their agreement to curb oil production. Rising U.S. oil output, particularly from shale drillers, is contributing to the ineffectiveness of the OPEC-led cuts. On that last note, investors also looked ahead to the Baker Hughes' U.S. rig count data for the latest week. The prior data showed that U.S. drillers added rigs for the 21st week in a row, the longest such streak on record, implying that further gains in domestic production are ahead.