Multi-stage pressure equalization valve assembly of subterranean valves

Details for Australian Patent Application No. 2010303821 (hide)

Owner Baker Hughes Incorporated

Inventors Plunkett, Kevin R.; Megill, Mark S.

Agent Freehills

Pub. Number AU-A-2010303821

PCT Pub. Number WO2011/043953

Priority 12/574,970 07.10.09 US

Filing date 28 September 2010

Wipo publication date 14 April 2011

International Classifications

E21B 19/08 (2006.01) Handling rods, casings, tubes or the like outside the borehole, e.g. in the derrick

E21B 34/10 (2006.01) Valve arrangements for boreholes or wells

E21B 34/12 (2006.01) Valve arrangements for boreholes or wells

Event Publications

19 April 2012 PCT application entered the National Phase

  PCT publication WO2011/043953 Priority application(s): WO2011/043953

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