简介：CECTO公司推出处理海上废水的新技术，它能够除去深水采油过程中产出水中的缓蚀剂和氧化物。

A new technology offers the option to treat and retain chemically-contaminated oilfield water at the seafloor, without a topsides facility. CETCO Oilfield Services’ Nomadic Environmental Media Operated Host (NEMOH) is a flexible and portable technology capable of removing corrosion inhibitors and biocides from produced water at water depths up to 6,000 ft.

NEMOH consists of a container fitted with a protective cage and lifting frame. The container is where the processing takes place; the container can be operated with different media types and can treat different constituents depending on whether those constituents need to be oxidized, coalesced, or neutralized. Treatment at the seafloor is more time efficient compared to traditional topsides methods; this efficiency is realized whether the NEMOH is operated as a standalone vessel or in conjunction with a series of vessels.

The company says that NEMOH was developed in response to an operation that lacked topside facilities due to project delays. The unit is installed at the seafloor via a remotely operated vehicle (ROV). The ROV communicates with the unit through a device known as a hot stab or quick-couple hose line at the inlet. The ROV then connects the other end of the line to the outlet or pipeline end termination (PLET). To ensure that the path of contaminated water flow is only through the inlet and outlet of the vessel, all equalization valves on the NEMOH are closed prior to beginning a treatment.

Once the treatment process is complete, this flexible and portable technology can be recovered in reverse process, disconnected, or guided by a remotely-operated vessel (ROV) using a ship’s wench to another location on the seafloor for another application. The unit has since proven itself very effective in temporary installations in varying sea levels and in a variety of marine environments including fresh, salt, or brackish waters.

CETCO Oilfield Services has successfully installed a NEMOH unit for a project in the US Gulf of Mexico, where the unit reportedly treated the water more quickly, allowing the operator to enhance production and ensure compliance with discharge legislation.

The range of potential applications for the NEMOH unit includes the treatment of: 

• The depressurization of fluids after a hydrotest
• The overflush of fluids from a chemical treatment
• Fluids from the deoiling of difficult-to-flush lines
• Fluids for the addition of subsea architecture
• Fluids from repairs and abandonment of lines and wells.