Mexico's proven oil and gas reserves dropped 21.3 percent in 2015, the oil regulator said on Thursday, as the state-run oil company, Pemex, cut back on investment because of plunging crude prices.

Prices, which have swung between highs of about $42 a barrel and lows of about $27 this year, will continue to be volatile in the short term, Al Jaber said in an interview with Abu Dhabi dailies The National and Al Ittihad.

OPEC secondary sources put Iran's current output at 2.93 million barrels per day (bpd). It is working to regain market share, particularly in Europe, after the lifting of international sanctions in January. The sanctions had cut crude exports from a peak of 2.5 million bpd before 2011 to just over 1 million bpd in recent years.

Brazil’s troubled state-run oil company Petróleo Brasileiro SA on Friday announced a beefed up voluntary layoff program that could affect up to 12,000 jobs amid intense efforts to cut costs.

Leading global drilling and engineering contractor, KCA Deutag, today announces that it has sold its jack-up drilling unit, the Ben Loyal to Egyptian headquartered Advanced Energy Systems A.D.E.S. SAE for an undisclosed sum.

The world’s biggest oil exporter lost ground to rivals in nine out of 15 top markets between 2013 and 2015, including China, South Africa and the US, according to an analysis of customs data.

The world’s biggest oil exporter, known as Saudi Aramco, won’t cancel any oil, gas or refining projects, Amin Nasser told reporters during a conference in Al-Ahsa in eastern Saudi Arabia. Aramco is also studying a possible expansion of the country’s largest oil refinery, Ras Tanura, which has a capacity of 550,000 barrels a day, he said Wednesday.

China, the world's top energy user, is keen to boost cleaner burning natural gas consumption to tackle air pollution.

The drilling cost per foot, based on total depth, and the completion cost per foot, based on lateral length, are both projected to maintain these lower cost trends through 2018. Sustained lower upstream costs may affect near-term oil and natural gas markets, and ultimately, the prices of these fuels.

The deal, which resolves arbitration proceedings between E.ON and Gazprom, will lead to a positive one-off effect of about 380 million euros ($425 million) on E.ON's core earnings (EBITDA) in the first quarter of 2016.