Well, besides all the this and that .... that really does matter...... you also have the fundamental fact that petroleum oil pricing has always required some sort of Supply throttling procedure .... because reality is ..... there always has been, is now, and will be until the Second Coming ....... 'too much' supply.
This often or better said for a real long stretch involved ( further back ) - involved mildly screwing over the mid level members on a part time basis but also critically, throwing the two traditional swing producers during this period referenced - who have almost always been forced to live off the scraps @ the table ...... into the ditch - yet again ie Libya ..... and Iraq.
( And yes, in third position would be Iran...... )
When the necessary arrangements and 'schedules' etc within are 'disrupted' or 'abruptly' changed...... for whatever reason or reasons ( it rarely is just about one thing ) ..... more of the natural pricing mechanism in a net sense comes forward.