EP 3167145 A1 20170517 - UNDERREAMER WITH RADIAL EXPANDABLE CUTTING BLOCKS
Title (en)
UNDERREAMER WITH RADIAL EXPANDABLE CUTTING BLOCKS
Title (de)
NACHRÄUMER MIT RADIAL AUFWEITBAREN SCHNEIDBLÖCKEN
Title (fr)
ÉLARGISSEUR COMPORTANT DES BLOCS DE COUPE A EXPANSION RADIALE
Publication
Application
Priority
- DK PA201470422 A 20140707
- DK 2015050205 W 20150707
Abstract (en)
[origin: US2017159365A1] A cutting tool (1) for widening the diameter of a borehole and method thereof is disclosed. The cutting tool (1) comprises a housing (2) having cavity (10) in which a moveable activation element (6) is arranged. The activation element (6) is moved in an axial direction and is connected to one or more cutting blocks via a mechanical coupling (15). The mechanical coupling (15) transfers the axial movement of the action element into a radial movement of the cutting blocks. An activation unit (24) pushes the activation element (6) towards a stopping position which in turn causes the cutting blocks (11) to move out of the housing. The activation unit (24) further pulls the activation element back towards its starting position which in turn causes the cutting blocks to move back into the housing. The cutting blocks (11) extend into one or more cavities formed in the activation element, thereby increasing the travel-to-expansion ratio. The cutting blocks can be replaced by stabiliser blades (20) which are used to stabilise the drilling in the expanded borehole.
IPC 8 full level
E21B 10/32 (2006.01); E21B 7/28 (2006.01)
CPC (source: EP US)
E21B 10/325 (2013.01 - EP US); E21B 17/1014 (2013.01 - EP US); E21B 44/00 (2013.01 - US); E21B 47/12 (2013.01 - EP US)
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
Designated extension state (EPC)
BA ME
DOCDB simple family (publication)
US 2017159365 A1 20170608; BR 112017000355 A2 20180116; CA 2954444 A1 20160114; DK 179097 B1 20171030; DK 201470422 A1 20160125; EP 3167145 A1 20170517; EP 3167145 A4 20170809; WO 2016004954 A1 20160114
DOCDB simple family (application)
US 201515324294 A 20150707; BR 112017000355 A 20150707; CA 2954444 A 20150707; DK 2015050205 W 20150707; DK PA201470422 A 20140707; EP 15819749 A 20150707