no major movement ahead for oil at least in first half of 2019

I think the supply side for oil will be abundant, considering the fact the tepid world economy will not consume as much oil as the last decade.
growth prospects of major economies looks dim except the US. Many institutes has trimmed down GDP growth rates in the last two month, citing significant headwinds for the world, like debt, trade disputes, geopolitical uncertainties and so forth.OPEC has every intention to reach a production cut deal for its members. Yet it can't control the behavior of non member states, especially the United States, which is the biggest producer in oil and gas and has become a net exporter. By cutting production, OPEC members probably will lose market share to other big players in export market.