How petroleum is extracted
An oil well is constructed by an oil rig drilling a lengthy hole into the ground. To offer structural stability to the newly drilled well bore, a steel pipe (casing) is inserted into the hole. The well's base is then drilled with holes to allow oil to flow into the bore. Finally, a "Christmas tree" of valves is attached to the top; the valves regulate pressures and control flow.
Primary recovery
Secondary recovery
Enhanced recovery
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