Seabox module on offshore platform preparing for installation subsea

Subsea Water Treatment Applications

We make subsea water treatment possible for greenfield and brownfield applications across the world.

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Whether you require a topside, subsea, or hybrid combination system for your field, our water management solutions cover the life of a development. From concept to greenfield to brownfield, our technologies optimize existing facilities or extend the life of your field. With leading technology and experience across the board, we provide optimal flexibility for your project developments, through full process solutions from incoming well stream fluid through to export. With expertise in produced water and seawater treatment, we understand the process flow detail and develop the optimal solution.

The purpose of subsea seawater treatment

Our subsea water treatment technologies can serve a broad range of applications. Typically, our oil and gas industry customers are interested in using the treated water for water injection purposes to optimize recovery from oil reservoirs. Optimized water treatment addresses typical reservoir issues, providing the following benefits:

  • Improves injectivity control
  • Reduces H2S souring potential
  • Avoids scale formation
  • Enhances oil recovery through altered wettability properties

Our Seabox™ and SWIT™ systems address water treatment challenges by enhancing the performance of existing topside facilities, enabling unmanned water injection, maximizing tie-back value, and improving reservoir value by providing smart water for enhanced oil recovery (EOR) and a significantly reduced carbon footprint.

Strategic drivers for field development

Subsea water treatment address several of the current market needs, as summarized below.

  • HSE - Enables unmanned field developments to reduce needs for offshore manning, service consumables, and hazardous chemicals.
  • Sustainability and carbon footprint - Reduces power demand by up to 85% compared to traditional solutions, depending upon required water specification and the equipment location’s water depth. In addition, usage of biocides and chemicals are drastically reduced, and the overall carbon footprint is reduced due to the absence of a requirement for a host facility and long pipelines.

  • Improve field economics - Increases oil recovery factor by adding cost-efficient, sustainable and reusable technology, decoupled from host.
  • Customer value - Improves the value stream from existing facilities and/or enables unmanned field developments and tiebacks with water injection. Reduces the need for topside host capital expenditures (CAPEX) and operating expenditures (OPEX), specifically on offshore manning, chemicals use, and power consumption.

  • Industrialization - Modular building blocks and components provide water of any quality and quantity without major project-specific reengineering. Equipment can potentially be reused for future projects.
  • Digitalization - By condition monitoring, analysis, and trending, the operations can be monitored from shore and a condition-based intervention supply chain can be realized, thereby optimizing the field operational strategy in terms of required offshore manning, system availability, and reduced need for sparing.

Application of different seawater treatment stages

Several water treatment process stages can be applied to achieve the desired water quality results. Solutions may consist of either one (or multiple) Seabox module(s) or together with one (or multiple) subsea ultrafiltration and nanomembrane modules.

Offshore field development application options

The subsea water treatment solution can be configured to the desired water quality and quantity, and the solutions can be combined with existing or new equipment, whether topside or subsea.


The injection of treated water into the well without an injection pump is one of the most simplistic applications from a system perspective. This applies when reservoir pressure is lower than the hydrostatic pressure from the water column in the wellbore. Consequently, this condition allows for injecting water without adding pressure from a pump.

  • No boosting required
  • Maximize recovery from existing fields, with minimal CAPEX
  • Low carbon footprint
  • No topside module integration and associated modification, production shut-down uncertainty

Pretreatment for topside facility

A subsea water treatment module can be added as a pretreatment step to an existing topside facility water processing plant. The respective module(s) will be located subsea at the foot of the facility, feeding water to the existing processing plant.

  • Overall increased utilization of topside facility, more barrels produced
  • Reduced OPEX – consumables, chemicals, and manpower requirements
  • Reduced HSEQ risk exposure due to minimized topside activities, as described above
  • Supports unmanned philosophy

Subsea tieback

Subsea water treatment enables the field development of marginal assets through subsea or unmanned tiebacks, allowing water treatment next to the injection well with its inherent benefits.

  • Improved field economics
  • Reduced carbon footprint with optimized process due to inherent benefits of being at the seabed
  • Reduced HSEQ risk exposure, due to minimized topside activities
  • Flexibility to remove or add capacity based on reservoir response to water injection
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Main Seaback tieback in operation subsea
Seabox tie back render
Seabox module installed on the seafloor

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