“The Islamic State has lost control of approximately 95 percent of its oil production capacity following the advancing Iraqi counteroffensive, according to a leaked German intelligence report. Last June, a massive offensive by armed members of the Islamic state, also known as the Islamic State of Iraq and al-Sham (ISIS), conquered much of northern Iraq, including the cities of Mosul and Tikrit. As the crumbling Iraqi army kept hastily retreating south, ISIS forces encountered almost no resistance during their onslaught.”
Source: ISIS has lost control of most oil fields: German intelligence report | intelNews.org