VARIABLE ANNULAR VALVE NETWORK FOR WELL OPERATIONS

A method and system for creating a multi-gradient pressure regime within a wellbore annulus. A plurality of valve subs provided along a drill string with each sub including a port for selectively venting supply fluid from the drill string to the annulus. A valve is coupled to the port to control the...

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Bibliographische Detailangaben
1. Verfasser: Hay Charles Richard Thomas
Format: Patent
Sprache:eng
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