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1. WO1999004130 - REVERSE CIRCULATION DRILLING SYSTEM WITH BIT LOCKED UNDERREAMER ARMS

Publication Number WO/1999/004130
Publication Date 28.01.1999
International Application No. PCT/US1998/014651
International Filing Date 17.07.1998
Chapter 2 Demand Filed 18.02.1999
IPC
E21B 10/32 2006.1
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 10/66 2006.1
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
64characterised by the whole or part thereof being insertable into or removable from the borehole without withdrawing the drilling pipe
66the cutting element being movable through the drilling pipe and laterally shiftable
CPC
E21B 10/327
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
327the cutter being pivoted about a longitudinal axis
E21B 10/66
EFIXED CONSTRUCTIONS
21EARTH DRILLING; MINING
BEARTH DRILLING, e.g. DEEP DRILLING
10Drill bits
64characterised by the whole or part thereof being insertable into or removable from the borehole without withdrawing the drilling pipe
66the cutting element movable through the drilling pipe and laterally shiftable
Applicants
  • HOLTE, Ardis, L. [US]/[US]
Inventors
  • HOLTE, Ardis, L.
Agents
  • MARGER, Jerome, S.
Priority Data
08/896,78718.07.1997US
Publication Language English (en)
Filing Language English (EN)
Designated States
Title
(EN) REVERSE CIRCULATION DRILLING SYSTEM WITH BIT LOCKED UNDERREAMER ARMS
(FR) SYSTEME DE FORAGE A INJECTION INVERSE DOTE DE BRAS ELARGISSEURS VERROUILLES PAR OUTIL
Abstract
(EN) An underreamer drill bit assembly including a pilot bit (82) and extendable underreaming arms (88) operatively connected to the pilot bit (82). The underreaming arms (88) have an extended position for underreaming, and a retracted position in which the overall diameter of the underreamer drill bit assembly is less than the inside diameter of the well casing, permitting the entire bit assembly to be withdrawn through the well casing. In another aspect of the invention, the bit assembly is operatively connected to a dual wall pipe assembly (12). A supply of compressed air is conducted through the annulus (24) of the dual wall pipe assembly (12) to a down hole pneumatic hammer (13). Exhaust air from the down hole hammer (13) is directed to the bit assembly for continuous removal of drilling debris through a central evacuation tube (43) of the dual wall pipe assembly.
(FR) Un ensemble outil de forage élargisseur comprend un outil pilote (82) et des bras élargisseurs extensibles (88) connectés fonctionnellement à l'outil pilote (82). Les bras élargisseurs (88) présentent une position déployée d'élargissement, et une position rétractée dans laquelle le diamètre global de l'ensemble outil de forage élargisseur est inférieur au diamètre intérieur du tubage de puits, ce qui permet de retirer tout l'ensemble outil par le tubage du puits. Dans un autre aspect de l'invention, l'ensemble outil est connecté fonctionnellement à un ensemble tube (12) à double paroi. Une alimentation en air comprimé est conduite à travers l'espace annulaire (24) de l'ensemble tube (12) à double paroi, jusqu'à un marteau perforateur (13) à air comprimé de fond. De l'air d'évacuation provenant du marteau (13) de fond est dirigé vers l'ensemble outil afin de retirer en continu les débris de forage par un tube d'évacuation central (43) de l'ensemble tube à double paroi.
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