You might not have noticed, but OPEC is dead.
A combination of shale oil in the US, Saudi and US desire to the disrupt the Russian oil-economy and Iran/Saudi rivalries mean OPEC can't set prices anymore. The best they can do is try to restrict supply enough to stop them going bust[1].
Even that isn't a sure thing anymore - no one can be sure that even that small agreement will stick[2].
An Exxon/Russia agreement under the Trump presidency will bury OPEC. (Not sure Exxon/Russia will be better than OPEC, but OPEC won't be able to do anything about it.)
[1] http://www.abc.net.au/news/2016-12-01/opec-get-its-cartel-mo...
[2] http://oilprice.com/Energy/Oil-Prices/Goldman-Flip-Flops-Aga...