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China's first deep-water drilling platform --- CNOOC 981 (2)

(Science and Technology Daily)

08:16, May 15, 2012

First platform using the combine system of anchor mooring positioning and dynamic positioning

The CNOOC 981 is a big floating boat. How can it stay still and precisely drill oil wells on a deep-water sea with strong winds and waves?

It is the first platform that has adopted the combine system of anchor mooring positioning and dynamic positioning. Simply speaking, the platform is fixed in the anchor mooring positioning way on the sea of 1,500 meters deep and in the dynamic positioning way on the sea of 3,000 meters deep. In other words, the platform is balanced and positioned by using the eight thrusters to resist impacts on the boat from winds, waves and ocean currents.

Its central control room is like the "brain" of the entire platform. By operating rows of buttons in the central control room, the dynamic positioning engineer is in charge of positioning the CNOOC 981, whose weight is 31,000 tons and changeable carrying capacity is 9,000 tons. "I can guarantee the error is less than one meter," said an engineer.

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