在服务的间隔不可用，而导致的两倍常规石油间隔。
Where service intervals are unavailable, drain at twice the interval for conventional oil.
报告说存在着“极大地危险，即常规石油产量在2020年以前就达到顶峰”。
There is, it says "a significant risk of a peak in conventional oil production before 2020".
非常规石油拯救不了我们：即便启动开采加拿大沥青砂这一应急方案，到了2030年每天也只能供500万桶。
Unconventional oil won't save us: even a crash programme to develop the Canadian tar sands could deliver only 5m barrels a day by 2030.
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