How oil is produced
Before oil can be extracted from the carth first must examine the land and the rock layers that geologists could not lie underneath the surface. Up to about 30 years drilling for oil was a great risk. Geologists ago guarantee that oil would be found where they presumed. Today m exploration methods make it possible to find oil with a 70% success rate. Most of the world's oil is produced by drilling into the crust of the earth, crude oil is found together with gas, which noats above the oil layer. Sometimes gas is extraeted together with oil during the drilling process, at other times it is simply burned om when it comes to the surface. Before oil can be brought to the surface a drilling rig is set up. oil is often buried deep down in rock layers, so that drills must go down to a depth of 10000 meters and more. omshore rigs operate on platforms in the ocean. They drill for oil underneath the ocean floor. After it is brought up to the surface crude oil is brought to refineries, where it is made into petrol or gas, heating oil, kerosene, fuel for airplanes and plastic products. Other chemicals and fertilizers are also made out of crude oil. Not all oil is found in rock below the surface. Some lies trapped in oil sands, but production is still expensive.