Hello aspirant,

To get a B.Tech program in Petroleum Engineering, you will requires a minimum 10+2 qualification in Science stream with Physics, Chemistry and Maths. Your class 12 overall aggregate is also required to be very high.

The cut off for the class 12 board exam aggregate will depend on the choice ofnyour colleges. 

There's no such specific requirements for that. You just have to clear the competitive exams like JEE and with a decent rank you can get a good college. Some of the top colleges for petroleum engineering are

IIT Bombay 

IIT Dhanbad 

UPES Dehradun 

MIT Pune

PDPU  Gandhinagar