What is a tertiary oil recovery, secondary oil production?

Usually the use of oil exploitation of petroleum energy called a recovery; To oil injection water, gas, and add energy to the exploitation of oil reservoir called secondary oil; And with chemical substances to improve oil, gas, water and rock mutual performance, mining out more oil, called tertiary oil recovery. And say to improve oil recovery (EOR) method. Improve the method of oil recovery is very much, basically have the following some: note surfactant; Note polymer thick water; Note the defiled flooding; Note the CO2 flooding; Note alkali and polymer flooding; Note inert gas flooding; Note hydrocarbons phase of mixed flooding; Fire reservoir; Note the steam flooding, etc. With microbial method to improve oil recovery can also be ownership tertiary oil recovery, also some people call it four times oil production.http://www.sjpec.com/