Brent crude prices LCOc1 were at $49.70 per barrel at 1351 GMT, down 42 cents. Brent is about 8 percent below its open on May 25, when OPEC and other producers agreed to extend oil output cuts through to the first quarter of 2018. U.S. light crude prices CLc1 were at $47.69 per barrel, down 50 cents.

EIA forecasts Brent spot prices to average $53/b in 2017 and $56/b in 2018.

The US Energy Information Administration lowered its crude-oil price forecast and raised its US production outlook for 2018. The lower price forecast reflects the possibility of a return to modest oversupply in global oil markets in 2018.

Global benchmark Brent LCOc1 advanced 1.1 percent to $50.48 a barrel. U.S. oil CLc1 also climbed 1 percent to $48.17.

A crude price in the $50s is the new reality for bosses of some of the world’s largest producers as output caps from OPEC and its allies are balanced out by rising U.S. shale.

As oil prices sag despite OPEC’s renewed efforts to shore up world crude markets, Wall Street banks have more bad news for the producer group: the outlook for next year isn’t great either.

Benchmark Brent crude futures LCOc1 were off by nearly 3 percent at $49.14 per barrel at 1034 GMT (6:34 a.m. ET), down $1.49 from the previous close. U.S. West Texas Intermediate crude CLc1 futures fell $1.45 cents to $46.91 per barrel.

В своем докладе Глава «Роснефти» заявил, что период низких нефтяных цен надолго, в настоящее время цены зафиксировались в диапазоне от 45 до 50 долларов за баррель Брент, а волатильность рынков и неопределенность значительно выросли. «Нынешняя «передышка» не должна нас успокаивать, - заявил Игорь Сечин, – условий для стабильной работы рынка пока не создано. Ряд крупных производителей, которые не участвуют в договоренностях, активно используют конъюнктуру для усиления собственной рыночной позиции, что, скорее, создает предпосылки для новой нестабильности, нежели для выхода на траекторию устойчивого роста».

Средняя цена нефти марки Urals по итогам января-мая 2017 года составила $51,29 за баррель.

"When these factors are taken together I can only conclude that the supplies coming from marginal barrels including shale production will not be sufficient to meet the future need for incremental capacity the mid-term," Falih said. "The market balance is already pointing in that direction," he added.