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Well Processing

Subsea Water Injection and Treatment (SWIT) for Increased Oil Recovery

Skogstostraen 25,
N-4029 Stavanger,

Skogstostraen 25,
N-4029 Stavanger,

Well Processing, a Norwegian subsea technology company, provides engineering solutions for subsea processing, including its unique subsea water injection and treatment (SWIT) technology.

Subsea water injection and treatment (SWIT)

SWIT is a breakthrough in water treatment for subsea processing that enables:

  • Increased oil recovery and enhanced oil production
  • Significantly reduced CAPEX and OPEX

SWIT can be utilized for all oil fields where seawater is used for pressure maintenance and drive mechanism. Well Processing can perform engineering studies and investigate how SWIT may benefit your specific application. It has a resource base of more than 800 engineers and specialists with a blend of topsides processing and subsea expertise.

Increased oil recovery seabed treatment

Injection of seawater into an oil reservoir is a recognized method of increasing the recoverable volume of oil in place and enhances production. Traditional methods for treatment of seawater come at a price: heavy and expensive treatment plants that are costly and operator intensive to run. Injection volumes are limited by several factors and require valuable topside well slots that should preferably be used for production.

The SWIT technology overcomes these restrictions by placing equipment on the seabed and is suitable for both new and mature fields. The SWIT treatment principles are proven at laboratory scale and an industry-sponsored pilot will be demonstrating the technology in the field.

Flexible subsea water and injection treatment

SWIT gives reservoir engineers the flexibility to inject as much treated seawater as desired into areas of the reservoir that will benefit the most. Engineering studies have shown that SWIT may reduce CAPEX by up to 50%.

SWIT can be run continuously for up to two years without any sort of intervention and a reduction of more than 25% OPEX is usually expected.

Solid removal

Inorganic particles down to 10µm can be removed from the raw seawater. A patented stillroom concept is the key element in the removal process. The removal process does not use any filters, which eliminates clog up, and there is no required maintenance for a continued operation of up to two years.

Seawater sterilization

The raw seawater is sterilized in a two-stage process. The first stage comprises electrical generated hypochlorite, including a long exposure time, which enables the chlorine to work properly. The second stage comprises a new and patented technology utilizing electro-chemically generated hydroxyl radicals for sterilization.

Hydroxyl radicals work instantly , are 2.5 times more bactericidal and fungicidal than chlorine and have proven extremely effective for this sterilization process. The whole sterilization process is designed for a minimum of two years’ continuous operation without intervention.

SWIT system sterilization

The SWIT system also provides for a periodic shock dosing with biocide similar to conventional topside systems. However, due to superior sterilization, the biocide requirements are reduced and the dosing intervals may be extended significantly. The replenishing of chemicals is every two years and is handled in sealed containers with no exposure to personnel.

Seabed injection

The treated seawater can be injected directly into the reservoir by a subsea injection pump or transferred to a topside platform or an onshore facility, depending on requirements and the configuration of the complete system.

Subsea seawater treatment

SWIT has the following benefits:

  • Provides as much water as required at the location where it is required
  • Provides purer and better quality water than traditional systems; for offshore fields, no seabed pipelines or long deviated wells are required
  • An easy-to-install all electric solution with flexibility in power and signal supply
  • Reduces environmental impact due to less chemical usage and significantly lower power requirements

Trestakk Oil and Gas Field

Trestakk is an oil and gas field located in the Norwegian Sea in block 6406/3. The field lies in production license PL091, approximately 27km south-east of Åsgard A.

Brynhild Oil Field

The Brynhild oil field lies in production license 148 in Block 7 of the Norwegian North Sea at a water depth of 80m.

Smørbukk South Extension, Norwegian Sea

The Smørbukk South Extension is an improved oil recovery (IOR) project that has been developed by Statoil with a total investment of Nkr3.5bn ($424.8m).

Well Processing Publishes Free White Paper

Well Processing, a leading Norwegian subsea technology provider, has released a free white paper on the Offshore-Technology website. Subsea water injection and treatment (SWIT) is a patented breakthrough technology in the treatment of seawater for the injection into reservoir. Main adv

HitecVision Announces Private Placement

HitecVision has announced in a news release that Well Processing just completed a private placement of NOK35m ($5.5m). The placement was priced at an pre-money valuation NOK108m, giving HitecVision a indirect ownership of 46.5%. Through this private placement the comp

Well Processing Present SWIT Pilot Results at ONS 2010 Exhibition

Well Processing is pleased to present the results of the succesful SWIT pilot at ONS 2010 in Stavanger, on 24-27 August 2010. The results have also been presented in a dedicated press release. Tests prove that the treatment with the SWIT unit has significant effects on delaying the for

SWIT Pilot – One Year of Successful Operation

At the end of July, Well Processing's full-scale subsea water treatment pilot plant has passed one year of operation on the seabed. The SWIT full-scale pilot plant is the world's first in the treatment of seawater on the seabed. Deployed in July 2009 (with funding from ConocoPhillips,

Well Processing

Skogstostraen 25

N-4029 Stavanger