EP 2339109 B1 20171220 - Earth drilling tool and method
Title (en)
Earth drilling tool and method
Title (de)
Erdbohrwerkzeug und -verfahren
Title (fr)
Outil et procédé de forage du sol
Publication
Application
Priority
SE 0951022 A 20091223
Abstract (en)
[origin: EP2339109A2] The present invention relates to a drilling tool for down-the-hole drilling, which drilling tool is intended to drill a hole ahead of a following casing tube, the drilling tool comprising a drill assembly which comprises a central pilot drill bit portion, a peripheral ring shaped drill bit portion and a casing shoe , said assembly being coupled to a drill string wherein the drill string is connected to the assembly via a drive shaft device which releasably interfits with the central pilot drill bit portion for transmitting torque from the drill string to the drill assembly.
IPC 8 full level
E21B 7/20 (2006.01); E21B 10/32 (2006.01); E21B 10/64 (2006.01)
CPC (source: EP)
E21B 7/20 (2013.01); E21B 7/208 (2013.01); E21B 10/64 (2013.01)
Designated contracting state (EPC)
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
DOCDB simple family (publication)
EP 2339109 A2 20110629; EP 2339109 A3 20160914; EP 2339109 B1 20171220
DOCDB simple family (application)
EP 10196499 A 20101222