Which business is best for after petrlolium engineering?

Hello,
I cannot say much about the business after petroleum engineering because it totally depends on entrepreneurship if you want yo start your own business. But apart from your own business you can become a petroleum engineer.
Another opportunity :

You can  start an oil and gas consultancy, if you have got sufficient experience.
Looking at massive quantity of data oil and gas fields generate on daily basis, another option worth exploring is data analysis and data mining. You can start oil and gas based Tech company, which will have low upfront capital investment. This field has been growing recently because data mining and analysis can offer rich insights to oil and gas companies and could help them take smart decisions ( FYI: wrong decisions could have disastrous impact, especially for oil and gas companies! )
So I would say, if you have good interest in programming and mathematics, you can certainly start a company in this field. Or you cancertainly borrow talents who specializes in this field!
You can also start up your own company under the activities listed below :
(1) Onshore/off-shore Drilling
(2) Logistics/Storage and Transportation
(3) Refineries and Distilleries
I hope this would help you. For further queries please feel free to write me down in the comment box.

Hi Dipak,

After pursuing petroleum engineering you can variety of opportunity in this field like career as geologist, teaching, many jobs in the government sector like ONGC, HPCL, BPCL, Esser Oil, HOEC, CPCL, IOCL, GAIL. Which title excites you in this engineering as drilling engineer, production engineer, offshore drilling engineer, reservoir engineer. If you want to go for any of these titles then that will best for you after your engineering.