Dow Water & Process Solutions’ ultrafiltration (UF) membrane technology will soon start treating seawater off the coast of the Republic of the Congo required for reservoir injection. The UF seawater treatment installation on the new Moho Nord offshore floating production unit (FPU), commissioned by Total, will treat 210 000 bpd of seawater. High-quality water will be produced on the FPU through a compact multi-element UF system designed and supplied by Veolia Water Technologies, utilising DOW IntegraFlo™ UF elements.
High-quality injection water for oil recovery
Oil recovery operations require high-quality injection water in order to maximise reservoir performance. UF membrane technology is increasely being adopted in the industry as an effective method for the treatment of injection water on offshore oil and gas production facilities due to space and weight advantages, when compared to more conventional seawater pre-treatment options. High-quality treated seawater, delivered through UF membrane pre-treatment, also serves as an exceptional pre-treatment solution for the downstream sulphate removal unit (SRU), by reducing the rate of fouling of the sulphate removal membrane, thus reducing cleaning cycles and increasing overall plant availability.
Dow technnology will be used as a pretreatment in the Moho Nord FPU water injection system, enabling effective removal of suspended solids and bacteria from seawater. Following pre-treatment by the UF system, the seawater will be fed to the FPU’s Sulphate Removal Unit (SRU), equipped with DOW FILMTEC™ SR90 elements, prior to injection into the reservoir. The SRU removes the sulphate from the seawater, which prevents reservoir scaling and souring. The water is then injected into the oil bearing reservoir for waterflooding and pressure maintenance.
Designed for Total’s system requirements
“The Moho Nord project showcases our mutual commitment to deliver cost-effective, high performance technology to the oil and gas industry,” remarks Dave Sheldrake, Managing Director, Westgarth, a specialised business unit within Veolia Water Technologies. “Veolia and Dow worked closely to optimise the offshore module based on Total’s system requirements, leveraging our respective Company’s strengths to provide, a compact, efficient, UF membrane seawater pre-treatment solution.”
Adapted from press release by Cecilia Rehn
Read the article online at: https://www.oilfieldtechnology.com/drilling-and-production/06062014/uf_membrane_technology_for_totals_oil_recovery_operation_in_west_africa/