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Offshore Operation Facilities by Menglan Duan, Huacan Fang

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3.11. Mining Methods and the Selection of Offshore Oil and Gas Fields

3.11.1. Mining Methods

1. Natural flow
    If the development totally depends on the natural energy of oil and gas layer, the fluid can flow through the wellbore to the wellhead from the oil and gas layer and enter into the ground processing system, maintaining the partial pressure, which is called natural flow. The general gas reservoirs are the main applications of natural flow, but parts of the gas reservoirs also use the drainage gas recovery in the production tail.
2. Artificial lift
    This is also known as mechanical oil production, including sucker rod pumps, screw pumps, electric submersible pumps, hydraulic piston pumps, jet pumps, gas lifts, piston pumps, cavity gas ...

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