Invention Grant
- Patent Title: Dual gradient drilling ship
- Patent Title (中): 双梯度钻井船
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Application No.: US12875527Application Date: 2010-09-03
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Publication No.: US08162063B2Publication Date: 2012-04-24
- Inventor: Gavin Humphreys
- Applicant: Gavin Humphreys
- Applicant Address: GB Aberdeen
- Assignee: Stena Drilling Ltd.
- Current Assignee: Stena Drilling Ltd.
- Current Assignee Address: GB Aberdeen
- Agency: Trop, Pruner & Hu, P.C.
- Main IPC: E21B7/12
- IPC: E21B7/12

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.
Public/Granted literature
- US20120055678A1 DUAL ACTIVITY DRILLING SHIP Public/Granted day:2012-03-08
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