Dynamic annular pressure control apparatus and method

Details for Australian Patent Application No. 2004213597 (hide)

Owner Shell Internationale Research Maatschappij B.V.

Inventors Van Riet, Egbert Jan

Agent Spruson & Ferguson

Pub. Number AU-B-2004213597

PCT Pub. Number WO2004/074627

Priority 86/2003 19.02.03 NG; 10/368,128 18.02.03 US; PCT/EP03/08644 01.08.03 EP

Filing date 18 February 2004

Wipo publication date 2 September 2004

Acceptance publication date 31 May 2007

International Classifications

E21B 21/08 (2006.01) Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor

E21B 21/10 (2006.01) Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor

Event Publications

8 September 2005 PCT application entered the National Phase

  PCT publication WO2004/074627 Priority application(s): WO2004/074627

31 May 2007 Application Accepted

  Published as AU-B-2004213597

27 September 2007 Standard Patent Sealed

20 November 2008 Assignment Registered

  Shell Internationale Research Maatschappij B.V. The patent has been assigned to @Balance B.V.

24 February 2011 Assignment Registered

  @Balance B.V. The patent has been assigned to PRAD Research and Development Limited

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