Shell, Grenland Implement Minox Deoxygenation System in GOM

An improved Minox system from Grenland Group is now effectively removing oxygen from the injection water of Shell’s Ursa platform in the Gulf of Mexico. The oxygen is removed in order to reduce corrosion in equipment and pipe systems, and to prevent growth of unwanted bacteria in the oil reservoirs. The technology from Grenland Group is drawing attention worldwide.

"We experience great interest for our Minox Deoxygenation systems. Especially in the current tight energy market, more oil companies would like to inject water in the reservoirs for enhanced oil recovery. In addition to be a stable system effectively removing oxygen from the injection water, the Minox system is both environmentally friendly and flexible with regards to design and capacities," said Hans Evald Henriksen, Grenland Group.

So far, nearly 30 Minox systems have been delivered to installations in the North Sea, USA, Brazil, Mexico, Malaysia and West-Africa. The Minox technology from Grenland stands out since the oxygen level in the water is efficiently removed without the use of chemicals. The systems are also very compact and lightweight compared to systems from other suppliers.

The Minox system on Shell’s Ursa platform, located 130 miles southeast of New Orleans, is an upgraded version with many improvements. It has the capacity to process 240 000 barrels of water per day.

"The Minox system on the Ursa platform has worked very well from day one, with measured results far below the required 20 parts per billion oxygen in the injection water. The system is also the first Minox Antifoam Free System in operation," continued Henriksen.

According to Shell, first injection of water on the Ursa and Princess Fields occurred on July 3, and with a listed volume enhancement capacity of 30-thousand barrels of oil equivalent per day, it is expected to extend the life of the field by 10 years.

Minox Technology, based in Notodden, was acquired by Grenland Group in 2006. The systems initially developed by Minox and Norsk Hydro’s Research Centre, are based on stripping oxygen from water with a closed loop circulated nitrogen gas that has been patented.