Shallow Oil and Gas Topics: CETCO Oilfield Services Goes Subsea with New Technology
CETCO Oilfield Services, a pioneer in the treatment of oilfield wastewater, has
developed NEMOH – a nomadic environmental media operated host – that acts as a
hosting treatment vessel for processing and retaining polluted fluids in a
subsea environment.
CETCO Oilfield Services’ first venture into the subsea sector, NEMOH is a new technology that can treat and retain chemically contaminated water without the need for a topside facility. The technology, described by CETCO as an equalized underwater media vessel, is capable of operating at depths of up to 6,000 feet.
Developed in response to an operation where project delays meant there were no topside facilities available, this technology is flexible and portable. It is proving very effective as a temporary installation that can operate at varying sea levels and in all types of marine environments, including fresh, salt or brackish water. The treatment of potentially hazardous chemicals, including corrosion inhibitors and biocides, at subsea level can be more time-efficient when compared to traditional topside methods.
The technology itself is a medium-sized container fitted with a protective cage and lifting frame. Initially, NEMOH is operated by topside technicians, however, following its immersion in the water, it is controlled by remotely operated vehicles (ROVs).
Particularly useful where no permanent topside facility is available, NEMOH is landed at the bottom of the ocean, and is communicated, via a device known as a “hot stab,” into the inlet and connected at the other end of the line to the out, or pipeline end termination. To prevent backflow or release of contaminated fluids to the surrounding marine environment, the NEMOH equalization valves are closed, and treatment then is able to begin.
When the treatment process is complete, NEMOH either can be recovered in a reverse process and disconnected, or it can be guided by an ROV along the seabed to another location.
CETCO Oilfield Services’ first venture into the subsea sector, NEMOH is a new technology that can treat and retain chemically contaminated water without the need for a topside facility. The technology, described by CETCO as an equalized underwater media vessel, is capable of operating at depths of up to 6,000 feet.
Developed in response to an operation where project delays meant there were no topside facilities available, this technology is flexible and portable. It is proving very effective as a temporary installation that can operate at varying sea levels and in all types of marine environments, including fresh, salt or brackish water. The treatment of potentially hazardous chemicals, including corrosion inhibitors and biocides, at subsea level can be more time-efficient when compared to traditional topside methods.
The technology itself is a medium-sized container fitted with a protective cage and lifting frame. Initially, NEMOH is operated by topside technicians, however, following its immersion in the water, it is controlled by remotely operated vehicles (ROVs).
Particularly useful where no permanent topside facility is available, NEMOH is landed at the bottom of the ocean, and is communicated, via a device known as a “hot stab,” into the inlet and connected at the other end of the line to the out, or pipeline end termination. To prevent backflow or release of contaminated fluids to the surrounding marine environment, the NEMOH equalization valves are closed, and treatment then is able to begin.
When the treatment process is complete, NEMOH either can be recovered in a reverse process and disconnected, or it can be guided by an ROV along the seabed to another location.
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