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Wet Compression

Wet Compression. A New Surface Flow Management Tool. Bryan V. Butler Manager, Multiphase Systems. Email: bryan.butler@weatherford.com. What is “Wet Compression”?. Gas and liquids in the same flow line Gas is the predominant, continuous phase Gas Volume Factor (GVF) is high: 95 to 99+%.

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Wet Compression

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  1. Wet Compression A New Surface Flow Management Tool Bryan V. Butler Manager, Multiphase Systems Email: bryan.butler@weatherford.com

  2. What is “Wet Compression”? • Gas and liquids in the same flow line • Gas is the predominant, continuous phase • Gas Volume Factor (GVF) is high: 95 to 99+%

  3. Types of Wet Compressors • Positive Displacement • Twin Screw • Mass Transfer • RamPump™ System

  4. Wet Compression Twin Screw Multiphase Pump • Liquids help compress gas • Liquids control slip flow

  5. Wet Compression Mass Transfer Pump • Linear Displacement Compression • Liquids help efficiency

  6. Wet Compression RamPump™ System Operates similar to: • Linear Displacement Compression • No liquid requirement

  7. Wet Compression Installation – Field Piping LIQUID TRAP (IF NEEDED) DISCHARGE WET COMPRESSOR SKID SUCTION

  8. Wet Compression Installation – Field Piping • Provide Isolation and Bypass (all units) • Provide Recirculation and Safety Relief (except RamPump) • Provide Liquid Trap if needed (except RamPump) • Capacity must allow for extended gas slugging • Filter seal flush liquids • Option -- Double Mechanical Seal System • Option -- Independent Coolant/Flush Line

  9. Wet Compression Installation - Controls • Downstream Pressure: Determined by downstream conditions • Inlet Pressure: Determined by pump rate Rate Control Methods: RamPump System Twin Screw & Mass Transfer Pumps • Hydraulic (100% - 0%) • 4-20 ma signal from pressure/level Xducer • Throttle (Manually Set) • VFDs for Electric Drive (100% -30%) • Throttle Controls - Engine Drive • Automatic Recirculation Controls • Transmissions or Belts & Pulleys • May need PLC

  10. MSCFPD = 0.1986 x BPDe x (p+14.7)/(t + 460) Where p = psig; t = deg F Wet Compression Flow Ratings • Compressor are rated by SCF • Multiphase Pumps are rated by flow rate at inlet conditions • Wet Compressors are pumping equivalent barrels of gas • Formula to convert to MSCFPD from BPDe:

  11. Mass Transfer Ram Pump Twin Screw • Higher Hyd. Press. • Stronger Hsg Wall • Volumetric Effic. • Higher Rod Loads • Casing and Rotors • Seal System • Slip Flow Increases • Cylinder Walls • Volumetric Effic. Wet Compression Compression Ratios and Operating Pressures Pumps affected different ways: Mass Flow Rate is Affected by Compression Ratio

  12. Cr = 18.2 Hi-Vol Low Press. Low Vol. Hi-Press. Surge Vessel Cr = 5.9 Cr = 3.1 250 psig 30 psig 800 psig Wet Compression High Compression Ratios – Staged Installation

  13. Bryan V. Butler 11909 Spencer Rd. (FM 529) Houston, Tx. 77041 USA Manager, Multiphase Systems Main: 713 983-5000 Direct: 713 983-5223 Fax: 713 983-5040 Mobile 281 705-6228 Email: bryan.butler@weatherford.com Thank you for your attention

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