Production wells are free flowing or lifted. A free flowing oil well has enough downhole pressure to reach a suitable wellhead production pressure and maintain an acceptable well-flow. If the formation pressure is too low, and water or gas injection cannot maintain pressure or is not suitable, then the well must be artificially lifted. For smaller wells, 0.7 MPa (100 PSI) wellhead pressure with a standing column of liquid in the tubing is considered a rule-of-thumb to allow the well to flow. Larger wells will be equipped with artificial lift to increase production even at much higher pressures. Some artificial lift methods are:

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