Subsea Multiphase Wet Gas Compressor
The OneSubsea Multiphase Wet Gas Compressor is a counter-rotating multiphase compressor based on a hydraulic and mechanical design, specifically set up for pressure boosting of an unprocessed wellstream. The unit is integrated and fully encapsulated, based on a well-proven design.
The multiphase compressor concept is ideal for subsea applications with a compact design, without any need for an auxiliary anti-surge control system, inter-cooler or inlet scrubber.
It is designed in three main parts: upper electric motor, compressor section, and lower electric motor. A barrier fluid system is used to provide overpressure protection, lubrication, and continuous cooling of the multiphase compressor's critical parts, during all modes of operation. All process, electrical power, auxiliary, and instrumentation connections are well-proven components, utilized in more than 25 subsea pumping projects.
The multiphase compressor includes the following features:
Multiphase wet gas compressor slug handling
- The multiphase compressor can tolerate 100% liquid without mechanical disintegration, i.e., slugs will be damped and transported through the compressor without interrupting operation.
- It includes a simple upstream flow conditioner for slug suppression and provision of homogenous feed to the compressor—no complex and costly pre-processing equipment is required.
Efficiency and reliability
- High efficiency in the high GLR area, verified up to 85% polytrophic efficiency at 98–100% gas
- High reliability design, with no surge or minimum flow limitations
- High pressure ratio possible due to ”positive density effect”
- High efficiency and low discharge temperature by applying inter-stage mixing and cooling
- Sand tolerant design and surge-free operation due to low specific blade loading