Question

modrn oil wells has been around far the last 150 year

Answer 1

Millions of wells have been drilled since US explorers launched the modern oil industry a century and a half ago. In those 150 years, technology advances have gradually improved the chances that wells will find oil and gas, and of producing them profitably. Technology has also expanded the oil and gas industry’s horizons to areas where exploration was once unthinkable, such as the depths of the ocean. 

Answer 2

The modern oil wells are around for the past 500 years. You can compare the oil reservoir as the air in a balloon.

The pressure comes around for the millions of years to convert in the fuel that is naturally present on the inner part of the earth.