E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
E21B 44/00 (2006.01) E21B 44/02 (2006.01)
Patent
CA 2230368
The invention relates to drilling with impregnated diamond drill bits where one automatically keeps the drill bit (30) cutting. The speed of the drilling device (3) along the feed device (2) is determined and the measured value is used for continuously controlling the feed cylinder (10) and the flushing medium pump (29) such that a substantially constant feed rate is achieved at the same time as the rotational speed of the drill bit (30) is kept within predetermined limits.
La présente invention concerne le forage au moyen de forets à diamants imprégnés dans lequel l'état coupant du foret (30) est maintenu automatiquement. Le procédé consiste à déterminer la vitesse de progression la foreuse (3) le long du chevalet applicateur (2), et à utiliser la vitesse ainsi mesurée pour réguler en permanence le galet de progression (10) et la pompe de boue de forage (29) de façon à maintenir une vitesse de progression sensiblement constante, la vitesse de rotation du foret (30) étant maintenue, simultanément dans des limites prédéterminées.
Jansson Kjell
Atlas Copco Craelius Ab
Fetherstonhaugh & Co.
LandOfFree
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