(19)
(11) EP 2 247 814 A1

(12)

(43) Date of publication:
10.11.2010 Bulletin 2010/45

(21) Application number: 09717703.4

(22) Date of filing: 06.03.2009
(51) International Patent Classification (IPC): 
E21B 7/04(2006.01)
E21B 4/14(2006.01)
(86) International application number:
PCT/SE2009/050240
(87) International publication number:
WO 2009/110847 (11.09.2009 Gazette 2009/37)
(84) Designated Contracting States:
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO SE SI SK TR
Designated Extension States:
AL BA RS

(30) Priority: 07.03.2008 SE 0800545

(71) Applicant: Styrud Ingenjörsfirma Aktiebolag
433 02 Sävedalen (SE)

(72) Inventors:
  • GRANBERG, Jerry
    SE-441 39 Alingsås (SE)
  • ANDERSSON, Per Åke
    SE-524 92 Herrljunga (SE)
  • BLOMDAHL, Johan
    SE-443 32 Lerum (SE)

(74) Representative: Johansson, Lars-Erik 
Hynell Patenttjänst AB Patron Carls väg 2
683 40 Uddeholm
683 40 Uddeholm (SE)

   


(54) A HORIZONTAL DIRECTIONAL DRILLING SYSTEM