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1. (WO1991017339) METHOD AND APPARATUS FOR DRILLING AND CORING
Latest bibliographic data on file with the International Bureau

Pub. No.: WO/1991/017339 International Application No.: PCT/US1991/002874
Publication Date: 14.11.1991 International Filing Date: 26.04.1991
Chapter 2 Demand Filed: 08.11.1991
IPC:
E21B 7/18 (2006.01) ,E21B 10/02 (2006.01) ,E21B 10/60 (2006.01) ,E21B 21/02 (2006.01) ,E21B 21/12 (2006.01)
E FIXED CONSTRUCTIONS
21
EARTH OR ROCK DRILLING; MINING
B
EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
7
Special methods or apparatus for drilling
18
Drilling by liquid or gas jets, with or without entrained pellets
E FIXED CONSTRUCTIONS
21
EARTH OR ROCK DRILLING; MINING
B
EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
10
Drill bits
02
Core bits
E FIXED CONSTRUCTIONS
21
EARTH OR ROCK DRILLING; MINING
B
EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
10
Drill bits
60
characterised by conduits or nozzles for drilling fluids
E FIXED CONSTRUCTIONS
21
EARTH OR ROCK DRILLING; MINING
B
EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
21
Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
02
Swivel joints in hose lines
E FIXED CONSTRUCTIONS
21
EARTH OR ROCK DRILLING; MINING
B
EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
21
Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
12
using drilling pipes with plural fluid passages, e.g. closed circulation systems
Applicants:
CURLETT, Harry, Bailey [CA/US]; US
Inventors:
CURLETT, Harry, Bailey; US
Agent:
MOORE, Stanley, R. ; Johnson & Gibbs 100 Founders Square 900 Jackson Street Dallas, TX 75202-4499, US
Priority Data:
516,12527.04.1990US
Title (EN) METHOD AND APPARATUS FOR DRILLING AND CORING
(FR) PROCEDE ET APPAREIL DE FORAGE ET DE CAROTTAGE
Abstract:
(EN) A drilling system that combines advantages of high pressure fluid jet cutting techniques with reverse circulation of borehole fluids through a concentric drill string. The preferred embodiment includes conventional drilling mud flowing in the borehole annulus (60) and a high pressure clarified fluid for discharge through the fluid jet. The concentric drill string (2) and fluid jet drilling tool (1) are used with reverse circulation fluid management to core and/or selectively enlarge a subsurface well bore. The dual-concentric drill string circulates the clarified drilling fluid at high pressures, downwardly, through the annulus (64) formed by the inner (7) and outer (2) pipe strings, through the drilling tool and upwardly through the inner string to continuously circulate drilled cuttings and/or drilled cores out of the well bore. The high pressure fluid is employed with the mechanical action of the drilling tool as a high pressure jet formation cutting system.
(FR) L'invention se rapporte à un système de forage qui combine les avantages des techniques de découpage par jet de fluide sous haute pression avec la mise en circulation inverse de fluides de trou de sondage à travers une rame de forage concentrique. Dans le mode de réalisation préféré, ce système utilise une boue de forage classique s'écoulant dans l'anneau (60) du trou de sondage et un fluide clarifié sous haute pression destiné à être déchargé à travers le jet de fluide. La rame de forage concentrique (2) et l'outil de forage à jet de fluide (1) sont utilisés avec une gestion du fluide à circulation inverse, afin de carotter et/ou d'élargir sélectivement un sondage de puits en sous-sol. La rame de forage concentrique double met en circulation le fluide de forage clarifié à des pressions élevées, vers le bas, à travers l'anneau (64) formé par les rames de tiges intérieure (7) et extérieure (2), à travers le trou de forage, puis vers le haut à travers la rame intérieure, de façon à mettre en circulation continuellement les découpes forées et/ou les carottes forées hors du sondage de puits. Le puits sous haute pression est utilisé conjointement à l'action mécanique de l'action de forage pour servir de système de découpage de formations par jet haute pression.
Designated States: AU, BR, CA, JP, NO, SU
European Patent Office (AT, BE, CH, DE, DK, ES, FR, GB, GR, IT, LU, NL, SE)
Publication Language: English (EN)
Filing Language: English (EN)
Also published as:
AU1991077965