Water To Sea provides a complete offshore temporary service package with industry-qualified application technicians adding benefits throughout the customer’s operating life cycle.  Our service teams, based in Brazil and the U.S. Gulf of Mexico region, provide services for new well construction and completion flow back fluids, facility startup and commissioning fluids, intervention flow back fluids, off-spec produced and slop water, and asset decommissioning waters.

The Water To Sea Treatment System was designed to be a true temporary system. It treats water to overboard discharge standards, minimizes waste - instead of creating it, and most importantly finishes the project on-time and on-budget, without consumable and waste-handling cost surprises.

Startup and Commissioning


Starting and commissioning a new offshore production facility requires large volumes of water which contain hydrocarbons, chemicals, and solids. These waters may source from subsea flow lines or export pipe lines inhibited with chemicals to prevent corrosion and protect the pipeline asset between installation and first oil.

Successful treatment of these fluids:

  • Reduces chemical contaminant concentrations to non-toxic or in-spec overboard discharge levels eliminating collection, transport and disposal of millions of gallons of contaminated seawater onshore

  • Lessens HSE risks and facility start-up and commissioning costs


When a new subsea well is constructed and brought on-line, the resulting “flow back” fluids contain a mixture of flow assurance chemicals and completion fluids, which may contain highly-toxic contaminants such as zinc, and produced fluids. This corrosive, potentially toxic, and emulsion-stabilizing cocktail creates havoc on the facility’s equipment and oil-water separation process, resulting in high BS&W (wet oil) and out-of-spec produced water. Isolating and treating these flow back fluids through a temporary water treatment system:

  • Reduces costs and HS&E risks,

  • Minimizes well shut-ins, the most important criteria when opening a new well.

  • Treat the small volumes of produced water generated in early asset life when produced water volumes are too low for the facilities’ produced water treatment system.


Early planning during facility design incorporates management of these fluids into the startup and commissioning procedures and develops a water management platform for future tie-ins, well intervention, and facility maintenance.

Well Intervention and Flow back


Intervention activities such as well re-completion, well stimulation, scale squeezes, and heavy hydrocarbon, paraffin and debris removal, result in highly-contaminated flow back fluids. If co-mingled with daily production, the result may be off-spec oil (high BS&W) and non-compliant produced water.

The robust Water To Sea Thincell® Electrochemical Treatment System is designed to:

  • Destabilize and breaks tight emulsions stabilized by completion, intervention, and flow assurance chemistry

  • Facilitate oil-water separation and the removal of fine oil coated suspended solid particulates resulting in compliant overboard discharge.

  • Reduces toxic metal contaminant concentrations like zinc, that may be a component of a deep well completion fluid

  • Reduced well start-up costs and EHS risks


On-line treatment of the intervention flow back fluids:

  • Maintains daily production

  • Minimizes the generation, collection, and ultimate disposal or recycling of off-spec fluids

  • Protects assets from corrosive fluids

  • Reduces intervention waste handling cost and EHS risks.

Off-line treatment of intervention flow back fluids collected and stored during multiple well interventions, or flow back fluids co-mingled with other off-spec produced fluids is a common practice if storage capacity is available

Produced Water and Slop Water

“Produced water” commonly refers to many different waste water streams in offshore oil and production. Produced water can include flow back water, produced water, produced water co-mingled with flow back water, or slop water.

Water To Sea’s temporary treatment of produced water, whatever its source, targets water that cannot be processed through the facilities’ produced water treatment system to meet overboard discharge standards.

Temporary produced water treatment is utilized:

  • In early asset life, when water production is too low for the produced water treatment system on-board

  • In late asset life, to augment the on-board water treatment system when water production exceeds the design capability of the on-board water treatment system.

Off-spec produced water and slop water are generated from many daily production activities and if not addressed properly, may result in facility shut-in and regulatory fines. To maintain production, it is not uncommon to divert the off-spec fluids to cargo or slop tanks. This diversion displaces oil storage capacity and increases oil off-loading frequency. It also provides a perfect environment for bacteria development promoting asset integrity degradation and environmental concerns.

The Water To Sea Thincell® Electrochemical Treatment System readily treats the off-spec fluids to regulated discharge criteria at high flow rates. There is no need to utilize filtration or membrane canisters, alternatives which require frequent and expensive replacement and onshore disposal.

Repair and Maintenance


The integrated Water To Sea Treatment System, or one of its components, can be utilized to maintain oil production and compliant overboard discharge when repair or maintenance is required on the facilities’ oil-water separation or on-board water treatment system.


The temporary system can treat hydrocarbon-contaminated seawater resulting from pipeline and flow line maintenance and repair. The Water To Sea system minimizes project downtime, operating expense and EHS risks associated with the collection and disposal of large volumes of contaminated water.


Decommissioning facilities, pipelines, and flow lines generate large volumes of hydrocarbon-contaminated water which may be treated on-site and discharged overboard, minimizing waste, EHS risks, costs and maximizing decommissioning up time.


Applicable Certifications Codes & Standards


The Water To Sea Thincell system is designed for standard treatment rates to 12,000 bbls/day at pressures up to 150 psi and temperatures to 170 ° F (77°C).

Its design is to IECEx EPL ZONE 2, (Gc), IIB, T3 area classification and is certified to applicable industry codes and standards including API, ASME, ANSI, ASTM, AWS, DNV, IMO (TOG Analyzer), IECEx, and Brazil’s INMETRO, MTE-NR, ABNT-NBR, and NBR-IEC.