Method and apparatus for controlling downhole rotational rate of a drilling tool

Details for Australian Patent Application No. 2009257951 (hide)

Owner Dreco Energy Services Ltd.

Inventors Marchand, Nicholas Ryan; Prill, Jonathan Ryan; Johns, Ralph William Graeme

Agent Pizzeys

Pub. Number AU-A-2009257951

PCT Pub. Number WO2009/151786

Priority 2,629,535 18.04.08 CA

Filing date 17 April 2009

Wipo publication date 17 December 2009

International Classifications

E21B 44/00 (2006.01) Automatic control

E21B 44/02 (2006.01) Automatic control

Event Publications

4 November 2010 PCT application entered the National Phase

  PCT publication WO2009/151786 Priority application(s): WO2009/151786

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