Subsea gas compression and pumping technologies have been identified as a solution for accessing gas reservoirs that may be otherwise either inaccessible or economically unfeasible to drill. Subsea stations offer a fast-track development solution with flexible, multi-phase deployment, and other inherent advantages whilst filling this application. Pumping stations require a significant amount of process equipment improvements and integration solutions; however, we will focus here on the rotating machinery, process pumps in specific. In the present research, all available operator or manufacturer's reports and published papers are reviewed and a criterion is developed for subsea pump selection base on:

  • The conventional subsea separation system is compared to a multi-phase pumping one.

  • All applicable types of subsea pumps including Helico-Axial (HAP), Twin Screw Pump (TSP) and Electrical Submersible Pump (ESP) are compared.

  • All parameters in pump type selection such as Gas Volume Fraction (GVF), water cut, differential pressure, head, flow rate, fluid viscosity, RPM, sand content, water depth, Opex, Capex, reliability and asset life is discussed.

  • Material selection as a critical part of the pump selection is studied thoroughly.

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