Power operated downhole tools, namely, a rotating control device powered by an electro-hydraulic unit used when drilling in offshore environments to create a pressure-tight barrier in the wellbore annulus in defense of potential drilling hazards such as kicks and shallow gas

'annulus':33 'barrier':29 'control':8 'creat':24 'defens':35 'devic':9 'downhol':3 'drill':19,38 'electro':14 'electro-hydraul':13 'environ':22 'gas':45 'hazard':39 'hydraul':15 'kick':42 'name':5 'offshor':21 'oper':2 'potenti':37 'power':1,10 'pressur':27 'pressure-tight':26 'rotat':7 'shallow':44 'tight':28 'tool':4 'unit':16 'use':17 'wellbor':32

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