EP 1396585 B1 20060517 - Head for injecting a fluid under pressure from a borehole to disintegrate ground
Title (en)
Head for injecting a fluid under pressure from a borehole to disintegrate ground
Title (de)
Kopf zur Einspritzung unter Druck von Flüssigkeiten von einem Bohrloch aus zum Zerkleinern von Erde
Title (fr)
Tête d'injection sous pression d'un fluide pour désagréger le terrain à partir d'un forage
Publication
Application
Priority
FR 0210251 A 20020813
Abstract (en)
[origin: EP1396585A1] A pressurized fluid feed line (34) is coaxial with a drill string and is connected via a pipe (50) to a nozzle (42) tangential to the nozzle axis and to the mechanical drilling tool (38) via a controllable valve (58). This pipe has a straight section which steadily reduces in diameter and a middle section which is curved with a continuously varying radius of curvature A head (30) injects a fluid under pressure to disaggregate soil before drilling, with the head mounted at the end of a drill string or tubes (32). A pressurized feed pipe (34) for the fluid is coaxial with the drill string. The head has a body (40) with an upper end (30a) connecting to the bottom end of the drill string or tubes, a lower wall for mounting a mechanical drilling tool containing a feed line (84) and an external wall. At least one injection nozzle is mounted in the body with an inlet diameter d and an axis xx' and a pipe (50) connecting the feed line to the nozzle inlet. This pipe has a rectilinear section running along the axis of the injection head and extending the feed pipe of the drill string. A second section contains an inflexion point (I) and a third section has a curvature of constant sign. The axis of the nozzle(s) are placed in a plane orthogonal to the longitudinal axis of the head. The injection head can have two feed lines for the mechanical tool, one connected to the first section of the pipe. The internal chamber is placed along the longitudinal axis of the injection head. The controllable valve has a seat and a movable closer whose position is controlled by the flow of liquid circulating in the valve.
IPC 8 full level
E02D 3/12 (2006.01); E02D 5/46 (2006.01); E02D 27/26 (2006.01); E21B 7/18 (2006.01)
CPC (source: EP US)
E02D 5/46 (2013.01 - EP US); E02D 27/26 (2013.01 - EP US); E21B 7/18 (2013.01 - EP US)
Designated contracting state (EPC)
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LI LU MC NL PT RO SE SI SK TR
DOCDB simple family (publication)
EP 1396585 A1 20040310; EP 1396585 B1 20060517; AT E326585 T1 20060615; DE 60305256 D1 20060622; DE 60305256 T2 20070503; ES 2262955 T3 20061201; FR 2843609 A1 20040220; FR 2843609 B1 20041029; JP 2004076573 A 20040311; SG 129253 A1 20070226; US 2005077041 A1 20050414; US 7000714 B2 20060221
DOCDB simple family (application)
EP 03291946 A 20030801; AT 03291946 T 20030801; DE 60305256 T 20030801; ES 03291946 T 20030801; FR 0210251 A 20020813; JP 2003292919 A 20030813; SG 200304823 A 20030811; US 63918803 A 20030811