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US 2015/0027781 A1Published application
Mud lift pump for dual drill string
AssigneeReelwell, A. S.
InventorsOla M. Vestavik, Harald Syse
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Abstract
A mud lift pump for a dual drill string includes an energy input and an energy output in fluid communication with a fluid return flow passage in the dual drill string.
Claims18
A mud lift pump for a dual drill string, comprising:
- an energy input in communication with a power source in the dual drill string;
- and
- an energy output in fluid communication with a fluid return flow passage in the dual drill string.
A method for controlling pressure in a wellbore having a dual drill string therein, the method comprising:
- pumping fluid through a fluid supply passage in the dual drill string;
- driving a pump energy input using power transmitted along the dual drill string;
- discharging the pumped fluid into the wellbore;
- imparting energy to fluid returned into a fluid return passage in the dual drill string from the wellbore using an energy output of the pump.
1 more element
Dependencies are inferred from the claim text.