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US 2012/0055678 A1Published application
Dual activity drilling ship
AssigneeStena Drilling Ltd.
InventorGavin Humphreys
Life of this patent
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Abstract
Dual gradient drilling may be performed by anchoring drilling tubulars from a drilling ship on the seabed. The drilling tubulars may include an inline pump for pumping mud through another set of tubulars that actually drill the well. Then dual gradient drilling may be instituted by controlling the pressure by controlling the operation of the pump.
Claims10
A method comprising:
- anchoring first tubulars, extending from a trolley on a drilling ship, said first tubulars including a pump;
- extending second tubulars from said ship;
- drilling with said second tubulars;
- pumping mud using said pump in said first tubulars down said second tubulars and up said first tubulars;
- and
- moving said ship while maintaining said first tubulars stationary.
3 more elements
(canceled)
(canceled)
Dependencies are inferred from the claim text.