Oil is on course for a second annual gain after last month’s decision by OPEC and its allies to extend production curbs in a bid to shrink bloated inventories. While some banks raised their 2018 crude price forecasts, others were less bullish. Among the most bullish is Goldman Sachs Group Inc. , which boosted its outlook for Brent crude by almost 7 percent to $62 a barrel, citing stronger-than-expected commitment from OPEC and partners. That compares with an average price of about $54 a barrel this year. Another bull, JPMorgan Chase & Co. , says “solid fundamentals and tightening balances,” as well as OPEC’s willingness to balance markets, are reasons for its positive outlook. On the other end of the spectrum is Citigroup Inc. , which says there’s a risk the current bullish supply and demand dynamic will run out of steam, and an upsurge in U.S. shale production […]