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IOR: is any method of producing or injecting (developing) a well (reservoir) that is not on primary production or commingled (not selective) production such as (secondary recovery like water flooding and tertiary like gas injection, chemical injection or microbial injection.

EOR: its tertiary recovery techniques for increasing the amount of crude oil that can be extracted from an oil field either by using Gas injection, Chemical injection, Microbial injection or Thermal methods.

Tertiary oil recovery reduces the oil's viscosityto increase oil production. Thermally enhanced oil recovery methods (TEOR) are tertiary recovery techniques that heat the oil and make it easier to extract. Steam injection is the most common form of TEOR, and is often done with a cogeneration plant. In this type of cogeneration plant, a gas turbine is used to generate electricityand the waste heat is used to produce steam, which is then injected into the reservoir. This form of recovery is used extensively to increase oil production in theSan Joaquin Valley, which has very heavy oil, yet accounts for 10% of the United States' oil production

Oil is primarily retrieved through drilling wells into underground reservoirs and then extracting the oil to the surface through pumps. This can be done on land or offshore. Other methods include enhanced oil recovery techniques, such as injecting steam or chemicals into the well to increase the flow of oil.