Controlled fragmentation of hard rock by pressurization of...

E - Fixed Constructions – 21 – C

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E21C 37/14 (2006.01) F42D 1/08 (2006.01) F42D 1/22 (2006.01) F42D 3/04 (2006.01)

Patent

CA 2187750

A controlled-fracturing process is accomplished by pressurizing the bottom of a drill hole (6) in such a way as to initiate and propagate a controlled fracture (11) or propagate any pre-existing fractures. A cartridge (5) containing a non-detonating propellant charge (4) is inserted at the bottom of a short hole drilled in the rock. The cartridge (5) is held in place or stemmed by a massive stemming bar (3). A firing pin (2) in the stemming bar (3) strikes a primer which then ignites the propellant (4) in the cartridge (5). The primary method by which the high gas pressures are contained is by the massive inertial stemming bar (3) which blocks the flow of gas up the drill hole (6). A preferred embodiment incorporates an indexing mechanism (37) to allow both a drill (39) and a stemming bar (3) to be used on the same boom (36) for drilling and subsequent charge initiation and firing operations.

Procédé de fracturation contrôlée consistant à mettre sous pression le fond d'un trou de forage (6) de façon à déclencher et propager une fracturation contrôlée (11) ou propager toutes fractures préexistantes. Une cartouche (5) contenant une charge propulsive (4) sans détonation est introduite au fond d'un trou peu profond percé dans la roche. La cartouche (5) est maintenue en place ou bloquée par un bourroir plein (3). Un percuteur (2) du bourroir (3) heurte une amorce qui déclenche ensuite la charge propulsive (4) de la cartouche (5). Le procédé de base, par lequel les gaz haute pression sont maintenus au fond du trou, est réalisé au moyen d'un bourroir d'inertie plein (3) qui bloque l'écoulement des gaz vers le haut du trou de forage (6). Selon un mode de réalisation préféré, un mécanisme de mise au point (37) permet d'utiliser à la fois un foret (39) et un bourroir (3) sur le même mât de charge (36) pour procédér au forage et pour effectuer ensuite les opérations d'amorçage et de déclenchement de la charge.

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