Petroleum Engineering

There are a number of books which you can follow for the GATE, just read thoroughly each chapter whichever book you follow. I am suggesting you some books:-
for production: - Production operations by Allen Robert (vol-1 & vol-2),
for Drilling - Well engineering and construction by H. Rabia,
for Reservoir - fundamentals of reservoir engineering by L.P Dake & book by Tariq Ahmed and for
Logging - Log interpretation principles and operations- Schlumberger.
Also, there are many books and handbooks which you can follow. Just remember don't follow so many books but complete each section of petroleum engineering from one book of each section.
Thank You!

Petroleum engineering is a niche field of engineering concerned with the activities related to the production of hydrocarbons, which can be either crude oil or natural gas. India has very well developed Petrochemical Industry including Petroleum & gas both in Government and private sector. It is core sector with lot of Government and big corporate houses support. Petroleum l Engineers have good scope in India and abroad. However, you must take into consideration that Petroleum engineering has historically been one of the highest paid engineering disciplines, although there is a tendency for mass layoffs in private sector worldwide when oil prices decline.

Petroleum engineering is a niche field of engineering concerned with the activities related to the production of hydrocarbons, which can be either crude oil or natural gas. India has very well developed petrochemical Industry including Petroleum & gas both in Government and private sector. It is core sector with a lot of Government and big corporate houses support Petroleum Engineers have good scope in India and abroad. However, you must take into consideration that
Petroleum engineering has historically been one of the highest paid engineering disciplines, although there is a tendency for mass layoffs in private sector worldwide when oil prices decline.

While it is true that Crude Oil is a non-renewable source of energy and that it will get exhausted one day, that scenario won't arrive all of a sudden! So, one doesn't need to worry about lack of jobs in this field in near future!
The job market saturation in case of Petroleum Engineering graduates is relatively very low. Yes, when it comes to other branches like IT, CS, Mechanical, Electrical Engineering, etc., the job market is too saturated. Each year, loads of Engineering Graduates pass out from Colleges, crowding the job market. In case of this Engineering Branch, job market saturation should not bother you much. This means there is a better chance of landing a good job when compared to other Engineering streams!