(19)
(11) EP 3 056 657 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
14.12.2016 Bulletin 2016/50

(43) Date of publication A2:
17.08.2016 Bulletin 2016/33

(21) Application number: 16155028.0

(22) Date of filing: 10.02.2016
(51) International Patent Classification (IPC): 
E21B 1/00(2006.01)
 E21B 47/01(2012.01)
(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 MD

(30) Priority: 11.02.2015 FI 20155093

(71) Applicant: Oy Robit Rocktools Ltd
33880 Lempäälä (FI)

(72) Inventors:
  • SOKKA, Joonas
    33270 Tampere (FI)
  • ALA-KANTO, Kimmo
    33270 Tampere (FI)
  • LEINO, Antti
    33470 Ylöjärvi (FI)

(74) Representative: Boco IP Oy Ab 
Itämerenkatu 5
00180 Helsinki
00180 Helsinki (FI)

   


(54) DRILLING TOOL


(57) The invention relates to a drilling tool for percussive drilling. The drilling tool comprises a drill string assembly (1) comprising at least one drill rod, a drill bit assembly (2), a central flushing channel. The central flushing channel havs a first central flushing channel section (3) in the drill bit assembly (2) and a second central flushing channel section in the drill string assembly (1), and a borehole survey tool (4) in the central flushing channel. The borehole survey tool (4) is arranged in the first central flushing channel section (3) of the drill bit assembly (2), The drill bit assembly (2) may be provided as a drill bit part and an adapter part, or alternatively, in a one-piece form as a drill bit part.







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Search report