EP 1402146 B1 20070523 - EARTH DRILLING DEVICE
Title (en)
EARTH DRILLING DEVICE
Title (de)
ERDBOHRVORRICHTUNG
Title (fr)
DISPOSITIF DE FORAGE
Publication
Application
Priority
- SE 0201273 W 20020627
- SE 0102373 A 20010702
Abstract (en)
[origin: WO03004824A1] The invention relates to a drilling tool and a method for down-the-hole drilling, the drilling tool being intended to drill a hole ahead of a following casing tube (13). The drilling tool comprises a central pilot drill bit (20), a reamer (33) and a guide body (12) for steering the drilling tool and casing tube relative to one another. To avoid problems with threaded connections, the guide body (12), reamer (33) and pilot drill bit (20) are mutually formed so that the rotational power is transferred from the guide body (12) to the reamer (33) and from the reamer (33) to the pilot drill bit (20), but without either of the two transfers of rotational power comprising any threaded connection, and so that an essentially radial displacement exists between the guide body (12) and the reamer (33). The construction also facilitates retraction of the reamer (33) without the pilot drill bit also needing to rotate.
IPC 8 full level
E21B 7/20 (2006.01); E21B 7/06 (2006.01); E21B 10/32 (2006.01); E21B 10/40 (2006.01); E21B 10/66 (2006.01)
CPC (source: EP US)
E21B 7/20 (2013.01 - EP); E21B 10/265 (2020.05 - EP US); E21B 10/40 (2013.01 - EP); E21B 10/66 (2013.01 - EP)
Designated contracting state (EPC)
AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR
DOCDB simple family (publication)
WO 03004824 A1 20030116; AT E363015 T1 20070615; CN 1599832 A 20050323; DE 60220277 D1 20070705; EP 1402146 A1 20040331; EP 1402146 B1 20070523; SE 0102373 D0 20010702; SE 0102373 L 20030103; SE 522135 C2 20040113
DOCDB simple family (application)
SE 0201273 W 20020627; AT 02744049 T 20020627; CN 02813357 A 20020627; DE 60220277 T 20020627; EP 02744049 A 20020627; SE 0102373 A 20010702