If the FORMATION EVALUATION analysis indicate the presence of hydrocarbons in commercial quantities. Production zones are identified for producing hydrocarbons. A production casing is run in hole and cemented.
The drilling mud in the well is then replaced with a COMPLETION FLUID.
Completion fluid is a clear fluid or simply brine formulated to be non damaging to prevent producing formations from getting damaged.

This video gives general overview of the process of cementing and perforation.

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Link to other Petro Proficient Videos

https://youtu.be/XqwW5x_WZpA
https://youtu.be/vbhK4d91XZM
https://youtu.be/Ofo426y2ykE
https://youtu.be/UIJ_cZPdD0Y
https://youtu.be/PD1pgIiAd90