EP 3433463 B1 20200701 - DOWN-THE-HOLE DRILLING DEVICE
Title (en)
DOWN-THE-HOLE DRILLING DEVICE
Title (de)
ABWÄRTSBOHRVORRICHTUNG
Title (fr)
DISPOSITIF DE FORAGE DE FOND
Publication
Application
Priority
- FI 20165233 A 20160322
- FI 2017050083 W 20170214
Abstract (en)
[origin: WO2017162909A1] The invention relates to a down-the-hole drilling device (1) for drilling to be performed with a casing pipe, wherein the drilling device comprises in its drilling head: a drilling arrangement having first drilling means for drilling a center hole and second drilling means for reaming the center hole for the casing pipe; and a flushing flow arrangement for feeding of a pressurized flushing medium onto a drilling surface of the drilling arrangement by a feed flow arrangement that is arranged to lead the flushing medium for drilling onto the drilling surface (P1) of the first drilling means at a flushing channel assembly (6a1) therein in essentially radial direction. The drilling surfaces of the first and second drilling means are provided with cutting inserts (10a) submerged therein. The drilling surface (P1) of the first drilling means comprises a protrusion assembly (PT) in order to enhance drilling efficiency and to guide drilling waste at the flushing channel assembly (6a1).
IPC 8 full level
E21B 10/61 (2006.01); E21B 7/20 (2006.01); E21B 10/38 (2006.01); E21B 10/60 (2006.01); E21B 10/64 (2006.01)
CPC (source: EP)
E21B 10/38 (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)
WO 2017162909 A1 20170928; EP 3433463 A1 20190130; EP 3433463 A4 20191106; EP 3433463 B1 20200701
DOCDB simple family (application)
FI 2017050083 W 20170214; EP 17769509 A 20170214