Crude oil is an extremely profitable commodity that is created from the fossil remains of animals and plants that perished millions of years ago. The dead organism(s) sink deep into the bottom of the ocean floor where it begins to decompose and is compressed by the layers of sedimentary mud, and undergoes a chemical process that converts the dead matter into crude oil and natural gas.
Movements within the Earth begin to trap this oil and natural gas between the reservoir rock layers. These movements include:
1) Folding – Horizontal movements that compress inward.
2) Faulting – Layers of rock begin to crack, and one side shifts upward or downward.
3) Pinching out – A layer of rock is squeezed significantly upward into the reservoir rock.
The oil drilling companies are an integral part of the oil and gas industry because they engage in exploration and extraction of one of the world’s most valuable resources, energy. Bringing energy to market for retail distribution is an extremely profitable business, but a very complex process. Geologists are the professionals who carry out the exploration work to locate crude oil. The objective of the geologists is to look for regions that present the perfect conditions to trap oil, for example an entrapment in reservoir rock. Geologists can measure the minute changes in the Earth’s gravitational field which could indicate the flow of oil. Another method to locate oil and gas is by the use of 3D and 4D seismic imaging processes that create shock waves that have the ability to penetrate through hidden rock layers, and then the reflection back to the surface is measured and analyzed. When a prospective “oil strike” that can yield a substantial profit is located, the position coordinates are marked by GPS for land and/or buoys if the discovery is over a body of water.
The Oil Drilling Process Simplified
When the profitable oil drilling site has been determined, geologists survey the perimeter boundaries and conduct an environmental impact study. It is during this process that the oil company will acquire the necessary titles and drilling rights to commence oil extraction, and then the drilling operations are initiated. The process is quite complex and beyond the scope of this article, but simplified they are as follows:
1) The land is prepared for extraction by being cleared of trees and other obstructions. Access roads are built at this time to allow for the movement of machinery.
2) Water is essential to the drilling process so if there is no access point nearby, water wells are dug by the oil workers.
3) Reserve pits are dug to dispose of rock shavings and the mud excavated during the drilling process. This by-product waste material is later encased in plastic to prevent contamination of the local environment.
4) Numerous secondary holes are dug to allow for the main hole. A rectangle shaped pit called a “cellar” is dug around the vicinity of the primary drilling hole. The cellar’s purpose is to provide access around the primary hole for workers and their specialized equipment.
5) The rig starts the drilling operations from the starter hole.
To learn more about crude oil read this international best-selling book which provides insight into the industrial world’s most valuable commodity.

