Oil prices fell more than 7 percent on concerns about global demand for petroleum, reversing a three-day rally that had pushed U.S. crude up 27.5 percent.

ConocoPhillips said Tuesday that it plans to cut about 10 percent of its global workforce.

Oil prices have rocketed more than 25 per cent in three trading sessions, with the latest boost coming from data on US production and vague hints of a change of thinking inside the Opec producers’ cartel.

“Today’s continuing pressure on prices, brought about by higher crude production, coupled with market speculation, remains a cause for concern for OPEC and its members—indeed for all stakeholders in the industry,” the commentary in the latest OPEC Bulletin said.

Supplies outside OPEC are expected to contract in 2016 for the first time since 2008, sliding by 200,000 barrels a day, according to the International Energy Agency. With consumption set to grow by 1.4 million barrels a day, OPEC and its de facto leader Saudi Arabia could seize the chance to broaden their market as competitors damaged by the price slump fall off.

"It's quite possible that if oil prices remain at the low levels for long, oil production could decline, as had been the case before. Anyway, we don't expect any significant cuts,"

"We cut our real GDP outlook... to take into account a weaker-than-expected second quarter, a deteriorating global emerging market outlook, and our oil price revisions,"

At a time when the oil price is languishing at its lowest level in six years, producers need to find half a trillion dollars to repay debt.

Russian oil firms are increasing their rouble profits and raising production as a weak currency protects their business, which has turned into one of the world's most profitable.

Thanks to measures on cost optimization and control adjusted earnings before interests, tax and depreciation (EBITDA) amounted to RUB 326 bln (USD 6.3 bln) and increased by 14.0%, adjusted EBITDА margin reached 24.8% in Q2 2015 compared to Q1 2015. Adjusted EBITDA for the H1 2015 increased by 3.2% compared to H1 2014 up to RUB 612 bln.

Demand for and production of oil and refined products grew across the board over the last year,” said API Chief Economist John Felmy. “In fact, demand for and production of oil and refined products were the highest July in eight years, since 2007.”

Brent crude, the international benchmark, jumped by $4.42 a barrel in afternoon trading to settle at $47.56. The 10.2 per cent gain marked its biggest one day advance since December 2008.

Although OPEC's statutes say support from a simple majority of the 12 members can trigger an extraordinary meeting, none will occur without support from Saudi Arabia, which has yet to give its blessing, OPEC delegates say.

In the first half of 2015, sales revenues were $51,294 million (-30.6% y-o-y). Net income attributable to LUKOIL decreased by 58.9% y-o-y to $1,695 million, EBITDA (earnings before interest, taxation, depreciation and amortization) decreased by 32.4% y-o-y to $6,379 million. In the first half of 2015, our financial results were affected by a sharp decrease in the hydrocarbon prices and non-cash write-off in the amount of $324 million.

Despite unfavourable market conditions and a negative impact of the tax manoeuvre, in the second quarter of 2015, the Company achieved a considerable improvement in its financial results. Revenue from sales gained 6.9% compared to the first quarter of 2015; adjusted EBITDA increased by 34.1%, while operating income jumped by 44.4%. In the second quarter of 2015, net income excluding minority interest was 57.2% higher than in the first quarter of 2015 and 12.9% higher than in the second quarter of 2014.