(19)
(11) EP 3 271 631 A1

(12)

(43) Date of publication:
24.01.2018 Bulletin 2018/04

(21) Application number: 15885322.6

(22) Date of filing: 18.03.2015
(51) International Patent Classification (IPC): 
F16L 15/04(2006.01)
 E21B 17/02(2006.01)
(86) International application number:
PCT/JP2015/001527
(87) International publication number:
WO 2016/147222 (22.09.2016 Gazette 2016/38)
(84) Designated Contracting States:
AL 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 RS SE SI SK SM TR
Designated Extension States:
BA ME
Designated Validation States:
MA

(71) Applicants:
  • NKK TUBES
    Kawasaki-shi Kanagawa 2100864 (JP)
  • Japan Agency for Marine-Earth Science and Technology
    Yokosuka-shi, Kanagawa 237-0061 (JP)

(72) Inventors:
  • SAKURA, Koji
    Kawasaki-shi Kanagawa 210-0864 (JP)
  • FUKUI, Toshihiko
    Kawasaki-shi Kanagawa 210-0864 (JP)
  • NARIKAWA, Tomoyuki
    Kawasaki-shi Kanagawa 210-0864 (JP)
  • INOUE, Tomoya
    Yokosuka-shi Kanagawa 237-0061 (JP)
  • MIYAZAKI, Tsuyoshi
    Yokosuka-shi Kanagawa 237-0061 (JP)
  • KYO, Masanori
    Yokosuka-shi Kanagawa 237-0061 (JP)

(74) Representative: Gill Jennings & Every LLP 
The Broadgate Tower 20 Primrose Street
London EC2A 2ES
London EC2A 2ES (GB)

   


(54) DRILL PIPE WITH DOUBLE SHOULDER TOOL JOINTS