Only few countries in the world have large reserves of oil and gas. Rest of the world depends on these countries for their energy needs in varying proportion. Few countries have their own modest oil and gas resources, but it is fast depleting. The time of easy oil are over, nations are desperately searching for new fields and also ways to take out last drop of oil from existing fields. One must understand that now every new find, and each barrel of oil from below the ground comes at a great cost. It is the technology that can help in their pursuit. The book is about the science and technology that is driving this industry. It covers all aspects which includes exploration, drilling, production, well servicing, maintenance, safety. The book is in two volumes; volume-1 is about exploration and drilling technology while the volume-2 explains the technology behind production, well servicing, safety and maintenance.