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1. WO2010085892 - CUTTING STRUCTURE FOR CASING DRILLING UNDERREAMER

Publication Number WO/2010/085892
Publication Date 05.08.2010
International Application No. PCT/CA2010/000131
International Filing Date 29.01.2010
IPC
E21B 10/32 2006.01
EFIXED CONSTRUCTIONS
21EARTH OR ROCK DRILLING; MINING
BEARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
10Drill bits
26Drill bits with leading portion, i.e. drill bits with a pilot cutter; Drill bits for enlarging the borehole, e.g. reamers
32with expansible cutting tools
E21B 10/60 2006.01
EFIXED CONSTRUCTIONS
21EARTH OR ROCK DRILLING; MINING
BEARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
10Drill bits
60characterised by conduits or nozzles for drilling fluids
CPC
E21B 10/322
EFIXED CONSTRUCTIONS
21EARTH DRILLING; MINING
BEARTH DRILLING, e.g. DEEP DRILLING
10Drill bits
26Drill bits with leading portion, i.e. drill bits with a pilot cutter; Drill bits for enlarging the borehole, e.g. reamers
32with expansible cutting tools
322cutter shifted by fluid pressure
Applicants
  • TESCO CORPORATION [CA]/[CA] (AllExceptUS)
  • GRAF, Kevin, C, [CA]/[CA] (UsOnly)
Inventors
  • GRAF, Kevin, C,
Agents
  • CALDWELL, Roseann, B.
Priority Data
12/363,44430.01.2009US
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) CUTTING STRUCTURE FOR CASING DRILLING UNDERREAMER
(FR) STRUCTURE DE COUPE POUR ÉLARGISSEUR DE FORAGE DE TUBAGE
Abstract
(EN)
An underreamer earth-boring tool is connected to a bottom hole assembly for casing drilling applications. The underreamer has a tubular body with a longitudinal axis. Arms are pivotally mounted to the body and movable between retracted and extended positions. An array of cutting elements is mounted to each of the arms. Each of the arrays is swept back so that the cutting elements farther from the axis than others rotationally lag the others.
(FR)
L'invention porte sur un outil de forage de terrain élargisseur qui est relié à un ensemble de fond de trou pour des applications de forage de tubage. L'élargisseur présente un corps tubulaire avec un axe longitudinal. Des bras, qui sont montés de façon à pouvoir pivoter sur le corps, sont mobiles entre des positions rétractées et étendues. Un groupe d'éléments de coupe est monté sur chacun des bras. Chacun des groupes effectue une oscillation vers l'arrière, de telle sorte que les éléments de coupe plus éloignés de l'axe que d'autres soient retardés en rotation par rapport aux autres.
Also published as
Latest bibliographic data on file with the International Bureau