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last 30 patents
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Patent Grant
Wellbore annular safety valve and method
Patent number
10,174,582
Issue date
Jan 8, 2019
Schlumberger Technology Corporation
Eirik Windegaard
E21 - EARTH DRILLING MINING
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last 30 patents
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Patent Application
WELLBORE ANNULAR SAFETY VALVE AND METHOD
Publication number
20150354315
Publication date
Dec 10, 2015
SCHLUMBERGER TECHNOLOGY CORPORATION
Eirik Windegaard
E21 - EARTH DRILLING MINING
Information
Patent Application
WELLBORE ANNULAR SAFETY VALVE AND METHOD
Publication number
20150053415
Publication date
Feb 26, 2015
SCHLUMBERGER TECHNOLOGY CORPORATION
Eirik Windegaard
E21 - EARTH DRILLING MINING