Brent crude oil rose slightly on Friday, underpinned by a weaker dollar and a power outage at Britain’s largest oilfield, though a supply glut kept prices pinned near $57 per barrel. Brent crude LCOc1 was up 15 cents at $57.07 by 0827 GMT. Front-month U.S. crude futures CLc1 were trading at $50.87 per barrel, down 4 cents from their last settlement. “With the Iran deal people are aware there is more supply coming so all impetus for a price correction higher has gone,” said Hans van Cleef, senior energy economist at ABN Amro in Amsterdam. Iran has started to ship oil to Asia that it had been storing offshore for months after Tehran and six world powers reached a landmark nuclear deal on Tuesday, clearing the way for an easing of international sanctions on Iran. […]