Daily Mail | China is now the BIGGEST crude oil operator in the North Sea Daily Mail CNOOC was blocked from buying a US oil company over national security concerns a decade ago. But no concerns appear to have been raised in Britain when the company bought Nexen, a Canadian oil operator with a large stake in North Sea oil, in 2012. Dark Clouds Loom for Oil as China Chases Blue Skies for G-20 China has taken over Scotland's North Sea oil production China takes control of North Sea oil drilling | News | The Times ... |