Hi Deep,
Congratulations for getting qualified in JEE.
Following are the suitable economical colleges for pursuing petrochemical engineering :

Indian School of Mines University (Dhanbad)


University of Petroleum & Energy Studies (Dehradun)

Pandit Deendayal Petroleum University (Gandhinagar)

Maharashtra Institute of Technology (Pune)

M.S. Engineering College (Bangalore)

L.D. College of Engineering (Ahmedabad)

G.H. Patel College of Engineering

Rajiv Gandhi Institute of Petroleum Technology