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Subsea Water Treatment and Injection

Subsea Water Treatment and Injection

​Increase oil recovery with seawater injections

Seawater injection is widely used in increased oil recovery. These systems are typically large and heavy and impose substantial capacity challenges to offshore floating facilities. BHGE's subsea alternative moves the entire system to the sea floor and eliminates the need of heavy high-pressure risers and expensive pipelines.

Eliminate conventional cleaning and reduce maintenance

  • BHGE's approach to subsea seawater treatment is to eliminate the conventional chemical cleaning (CIP unit) by operating the filtration membranes at lower fluxes. This greatly reduces CAPEX and system complexity while maintaining the system robustness and extends filters life.

    BHGE's subsea offering is the alternative to de-bottleneck topside facilities by placing the system on the seabed. This eliminates the need for heavy risers and high-pressure flowlines providing a cost-effective solution, especially attractive in brownfields and tie-ins. BHGE's system offers full flexibility to adapt and optimize injection capacity along the lifetime of the field. It also offers the possibility to defer the investment in increase oil recovery (IOR) until a better understanding of the reservoir IOR requirements is achieved. With this solution, interrupted production is avoided as the installation of a subsea system does not requires significant topside retrofits.

    Subsea water injections have many advantages, such as:

    • 5-years membrane lifetime - lower OPEX
    • No-CIP system - lower CAPEX, system complexity and HSE risk
    • UF pre-treatment - extended NF life and higher robustness
    • NF reject to backwash UF - smaller footprint and lower system complexity
    • Capacity flexibility - standardized modules to meet field life requirements
    • Chlorination in UF backwash line - no risk to damage NF with chlorine residual

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