Enhanced Produced Water Treatment Through Compact Flotation Technology
Highlighting the influence the technology can have on the environmental performance of an asset, on one recent project the CFU routinely treated 500m3/h of produced water, reducing the oil in water (OIW) content to <10mg/l.
Control of the system is very stable and allowances are made for transient conditions. As there is no liquid operating level, the CFU technology is ideal for floating production, storage and offloading (FPSO) applications. The rocking motion experienced on floating production facilities can have a detrimental effect on oil/water separation, but Opus’ CFU technology has been developed to manage these conditions and so is ideal for FPSO vessels and performs efficiently whether installed on an FPSO or on a rigid platform.
One particular project involved Opus commissioning its CFU system onboard an FPSO vessel located in the North Sea during particularly heavy seas with storm force 10 gales hitting the local area at the time. Wide transient conditions of flow and oil concentration were also experienced. However, Opus’ team was able to successfully achieve the operational and contractual objectives of the project. The package was installed as part of an OSPAR system to improve the produced water treatment on the vessel. Each train was designed to handle 430m3/hour of produced water from two different fields, with an outlet OIW requirement of 10–15ppm.
Another project comprised a two-stage compact flotation system with an inter-stage Opus Mare’s Tail unit. This package includes a reject
collection system to return fluids to the upstream process. The inlet oil concentration to the package is 1,000–1,500mg/l, with a required 10mg/l at the outlet.
Several upgrade projects have enhanced the oil removal performance of degasser vessels by utilising the associated gas in the inlet flow to achieve controlled gas release and flotation affects.
More recently, Opus supplied a single-stage skid-mounted CFU for the offshore Brazil region (see Figure 1). This unit will treat 357m3/hour of produced water to reduce an inlet oil concentration of 100mg/l to <29ppm OIW. The technology was delivered in early 2009, with commissioning by Opus personnel at a later date.
Compact flotation technology is increasingly utilised by oil and gas companies looking to enhance the environmental performance of their assets, with installation of the units offering significant additional benefits. Compact, cost-effective and easy to install and maintain, the technology can perform a major role in the meeting of offshore industry regulations.
Norwegian Water Technology Centre A/S
Independent R&D and consultancy (desktop, field and lab)
multidisciplinary services for solving environmental problems.
Oil & Gas Onshore and Offshore
• Pre-feasibility studies for new design or upgrading of water treatment. • Third party investigation of water treatment performance. • Trouble shooting, operational assistance and equipment rental. • Training and education of treatment plant operators. • Sampling and monitoring programs. • Produced water management; technology; re-injection (PWRI) • Water treatment technology assessment (biological, physical/chemical) • Specialised services; reservoir souring; MIC mitigation, emulsions; schmoo • Environmental impact monitoring and risk assessment
Proven track record (> 20 years expertise)
• Extensive operational experience (offshore and onshore, world-wide) • Recognized by authorities and branch organisations • State of the art laboratory and field equipment • Flexibilities
P.O. Box 6875, Rodeløkka, 0504 OSLO, NORWAY, Tel: +47 22 35 81 00 | Fax: +47 22 35 81 10 | www.aquateam.no | E-mail:
aquateam@aquateam.no
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