EP 2358971 A1 20110824 - DRILL STRING
Title (en)
DRILL STRING
Title (de)
BOHRSTRANG
Title (fr)
TRAIN DE TIGES DE FORAGE
Publication
Application
Priority
- AU 2009001527 W 20091124
- AU 2008906093 A 20081125
Abstract (en)
[origin: WO2010060134A1] A reverse circulation drill string including two or more multi-walled drill pipe sections coupled together in series. Each drill pipe section includes at least three concentrically arranged annular sections generally coaxially aligned with a drilling axis. The annular sections include an outer pipe, an intermediate tube enclosed within the outer pipe, the outer pipe and intermediate tube having a first axial conduit there between, and an inner tube arranged within the intermediate tube. The intermediate tube and the inner tube have a second axial conduit there between, the interior of the inner tube providing a third axial conduit therein. The second axial conduit is arranged for the passage of pressurised fluid to a drilling head of the drill string, the third axial conduit is configured as a cuttings passage through which cuttings from the drill head can travel, and the first axial conduit is arranged for communication with the environment external of the drill string.
IPC 8 full level
E21B 17/18 (2006.01); E21B 21/12 (2006.01)
CPC (source: EP)
E21B 17/18 (2013.01); E21B 21/12 (2013.01)
Citation (search report)
See references of WO 2010060134A1
Designated contracting state (EPC)
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 SE SI SK SM TR
DOCDB simple family (publication)
WO 2010060134 A1 20100603; AU 2009321521 A1 20110623; EP 2358971 A1 20110824
DOCDB simple family (application)
AU 2009001527 W 20091124; AU 2009321521 A 20091124; EP 09828432 A 20091124