OPMC didn't increase a production of crude oil.

Strong demand for Crude Oil from globally.

Interest rates are low,may be debt market has no such interest so FII/FPI shifted towards Commodity and demand spike has been increases.

Highest Volume in... (More)

Should I copy the content from google search and modify it or paste without modification? :-|

Let me post the the original content itself! 

https://www.livemint.com/market/commodities/five-reasons-why-global-oil-prices-have-jumped-to-3-year-high-11633953731294.html4