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Completion, in petroleum production, is the process of making a well ready for production (or injection). This principally involves preparing the bottom of the hole to the required specifications, running in the production tubing and its associated down hole tools as well as perforating and stimulating as required. Sometimes, the process of running in and cementing the casing is also included. Enhanced oil recovery (abbreviated EOR) is the implementation of various techniques for increasing the amount of crude oil that can be extracted from an oil field. Enhanced oil recovery is also called tertiary recovery (as opposed to primary and secondary recovery). According to the US Department of Energy, there are three primary techniques for EOR: thermal recovery, gas injection, and chemical injection.[1] Sometimes the term quaternary recovery is used to refer to more advanced, speculative, EOR techniques.[2] [3] [4] [5] Using EOR, 30 to 60 percent, or more, of the reservoir's original oil can be extracted,[1] compared with 20 to 40 percent using primary and secondary recovery

Importance of Well Completion Methods and Enhanced Oil Recovery Techniques in Oil and Gas Industry Operations