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1. WO1997049890 - METHOD FOR MEASUREMENT OF THE AIRFLOW IN ROCK DRILL BITS AS WELL AS MEASUREMENT MEANS FOR ACCOMPLISHING SAID METHOD

Publication Number WO/1997/049890
Publication Date 31.12.1997
International Application No. PCT/SE1997/001065
International Filing Date 17.06.1997
Chapter 2 Demand Filed 15.01.1998
IPC
E21B 10/18 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
08Roller bits
18characterised by conduits or nozzles for drilling fluids
E21B 21/08 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
21Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
08Controlling or monitoring pressure or flow of drilling fluid, e.g. automatic filling of boreholes, automatic control of bottom pressure
E21B 21/16 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
21Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
16using gaseous fluids
CPC
E21B 10/18
EFIXED CONSTRUCTIONS
21EARTH DRILLING; MINING
BEARTH DRILLING, e.g. DEEP DRILLING
10Drill bits
08Roller bits
18characterised by conduits or nozzles for drilling fluids
E21B 21/08
EFIXED CONSTRUCTIONS
21EARTH DRILLING; MINING
BEARTH DRILLING, e.g. DEEP DRILLING
21Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
08Controlling or monitoring pressure or flow of drilling fluid, e.g. automatic filling of boreholes, automatic control of bottom pressure
E21B 21/16
EFIXED CONSTRUCTIONS
21EARTH DRILLING; MINING
BEARTH DRILLING, e.g. DEEP DRILLING
21Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
16using gaseous fluids
Applicants
  • SANDVIK AB (publ) [SE]/[SE]
Inventors
  • MATTSON, Michael
Agents
  • CARLSSON, Lars-Åke
Priority Data
9602544-027.06.1996SE
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) METHOD FOR MEASUREMENT OF THE AIRFLOW IN ROCK DRILL BITS AS WELL AS MEASUREMENT MEANS FOR ACCOMPLISHING SAID METHOD
(FR) PROCEDE DE MESURE DU FLUX D'AIR DANS DES FLEURETS A ROCHER ET MOYEN DE MESURE POUR L'EXECUTION DU PROCEDE
Abstract
(EN)
In connection with rock drilling it is necessary to control the airflow through the drill bit in question. The pressure of the flushing air is measured in a reference area in order to mathematically calculate nominal and corrected airflow values through the drill bit with the aid of said pressure. According to the invention, existing nozzles (8) and/or channels (11) in the drill bit are utilised as a reference area for pressure measurement, and the real pressure is measured with the aid of a measurement means (14) which comprises a narrow tube (15) communicating with a manometer, which tube with an orifice is inserted into one nozzle (8) of the drill bit.
(FR)
Pour le forage de la roche, il convient de réguler le flux d'air à travers le fleuret à rocher en question. La pression de l'air d'évacuation est mesurée dans une zone de référence afin de calculer mathématiquement des valeurs d'écoulement d'air nominales et corrigées à travers le foret à rocher à l'aide de ladite pression. Selon l'invention, des buses (8) et/ou des canaux (11) existant dans le fleuret à rocher sont utilisés en tant que zones de références pour la mesure de la pression, et la pression réelle est mesurée à l'aide d'un moyen de mesure (14) comprenant un tube étroit (15) communiquant avec un manomètre, lequel tube doté d'un orifice est inséré à l'intérieur d'une buse (8) du fleuret à rocher.
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