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Oil and Gas Oil and GasPrimary Recovery: Produced by means of Natural pressure systemSecondary Recovery: Uses External fluids (water/gas/chemical) and injected into wells.Wells:Drilling Well: Used for drilling for oil & gas productionProduction Well: Produce oil & Gas.Injection Well: Water, gas, steam, co2 are injected through this.Christmas tree: Placed on the top of wellhead, have several.