Drilling
This is the main method of extracting crude oil and in modern times people are using slant drilling to extract the crude oil. Slant drilling is considered a better way to do this because the slant drilling pumps have a curve, and this allows for moil oil to be extracted in an efficient amount of time. You can also drill for oil extraction in water but this is done through oil rigs.

Other Types of Oil Extraction
Crude oil is not the only oil that can be extracted. Here is how oil is extracted from corn. The first thing a person does is take the corn off the cob; then he would steep the corn kernels in water for about forty minutes. Once you do this you will need to strain the kernels and press them with a oil pressing machine. After you do this you should skim the corn oil off the top of the liquid from when you pressed the corn.