By Alex Lawler, Rania El Gamal and Ernest Scheyder
VIENNA (Reuters) - OPEC and non-members led by Russia decided on Thursday to extend cuts in oil output by nine months to March 2018 as they battle a global glut of crude after seeing prices halve and revenues drop sharply in the past three years.
OPEC's cuts have helped to push oil back above $50 a barrel this year, giving a fiscal boost to producers, many of which rely heavily on energy revenues and have had to burn through foreign-currency reserves to plug holes in their budgets.
Oil's earlier price decline, which started in 2014, forced Russia and Saudi Arabia to tighten their belts and led to unrest in some producing countries including Venezuela and Nigeria.
The price rise this year has spurred growth in the U.S. shale industry, which is not participating in the output deal, thus slowing the market's rebalancing with global crude stocks still near record highs.
The nine-month extension was largely expected by the market. By 1530 GMT (11:30 a.m. ET), Brent crude was down nearly 3 percent at around $52.30 per barrel on disappointment OPEC would not deepen the cuts or extend them by as long as 12 months. [O/R]
In December, the Organization of the Petroleum Exporting Countries agreed its first production curbs in a decade and the first joint cuts with non-OPEC producer nations, led by Russia, in 15 years.
The two sides decided to remove about 1.8 million barrels per day (bpd) from the market in the first half of 2017 - equal to 2 percent of global production, taking October 2016 as the baseline month for reductions.
On Thursday, OPEC agreed to keep its own cuts of around 1.2 million bpd in place for nine months, Kuwaiti Oil Minister Essam al-Marzouq said.
OPEC and non-OPEC delegates said joint cuts with non-OPEC were agreed at around 1.8 million bpd, which would see non-OPEC producers again contributing a reduction of under 600,000 bpd.
Despite the output cut, OPEC kept exports fairly stable in the first half of 2017 as its members sold oil from stocks.
OPEC first suggested extending cuts by six months, but later proposed to prolong them by nine months. Russia offered an unusually long duration of 12 months.
"There have been suggestions (of deeper cuts), many member countries have indicated flexibility but ... that won't be necessary," Saudi Energy Minister Khalid al-Falih said before the meeting.
CUTS EXCLUDE NIGERIA AND LIBYA
OPEC produces a third of the world's oil. Its production reduction of 1.2 million bpd was made based on October 2016 output of around 31 million bpd, excluding Nigeria and Libya.
Falih said OPEC members Nigeria and Libya would still be excluded from cuts as their output remained curbed by unrest.
He also said Saudi oil exports were set to decline steeply from June, thus helping to speed up market rebalancing.
OPEC sources have said the Thursday meeting will highlight a need for long-term cooperation with non-OPEC producers.
The group could also send a message to the market that it will seek to curtail its oil exports.
"Russia has an upcoming election and Saudis have the Aramco share listing next year so they will indeed do whatever it takes to support oil prices," said Gary Ross, head of global oil at PIRA Energy, a unit of S&P Global Platts.
OPEC has a self-imposed goal of bringing stocks down from a record high of 3 billion barrels to their five-year average of 2.7 billion.
"We have seen a substantial drawdown in inventories that will be accelerated," Falih said. "Then, the fourth quarter will get us to where we want."
OPEC also faces the dilemma of not pushing oil prices too high because doing so would further spur shale production in the United States, the world's top oil consumer, which now rivals Saudi Arabia and Russia as the world's biggest producer.
"Less OPEC oil on the market enhances the opportunity for American energy to fill needs around the world, and will help us achieve energy dominance," Ryan Sitton from the Texas Railroad Commission, which regulates the large Texan oil industry, told Reuters.