(19)
(11) EP 2 092 153 A2

(12)

(88) Date of publication A3:
26.02.2009

(43) Date of publication:
26.08.2009 Bulletin 2009/35

(21) Application number: 07865141.1

(22) Date of filing: 04.12.2007
(51) International Patent Classification (IPC): 
E21B 10/26(2006.01)
(86) International application number:
PCT/US2007/086323
(87) International publication number:
WO 2008/076625 (26.06.2008 Gazette 2008/26)
(84) Designated Contracting States:
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC MT NL PL PT RO SE SI SK TR

(30) Priority: 15.12.2006 US 611310
29.01.2007 US 668341
12.02.2007 US 673872
10.08.2007 US 837321

(71) Applicant: Hall, David R.
Provo, UT 84606 (US)

(72) Inventors:
  • SHUMWAY, Jim
    Provo, UT 84606 (US)
  • TURNER, Paula
    Provo, UT 84606 (US)
  • LUNDGREEN, David
    Provo, UT 84606 (US)

(74) Representative: Miller, James Lionel Woolverton et al
Kilburn & Strode LLP 20 Red Lion Street
London WC1R 4PJ
London WC1R 4PJ (GB)

   


(54) SYSTEM FOR STEERING A DRILL STRING