Cryogenic pulsejet

E - Fixed Constructions – 21 – B

Patent

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Details

E21B 7/18 (2006.01) E21B 7/04 (2006.01) E21B 36/00 (2006.01)

Patent

CA 2600722

A cryogenic system is described for boring a small-diameter hole through various materials including rock, soil and stone. It employs a valveless technique in a borehead [3000] where cryogenic fluid [7] fills at least one pulsejet [3100] which has proximal [3001] and distal [3003] ends. The cryogenic fluid [7] is frozen into a plug [8] near the distal end [3003], acting as a valve. Cryogenic fluid [7] just distal to the frozen plug [8] is rapidly heated by thermal units [3510, 3530] causing it to become a rapidly- expanding gas bubble. The rapidly-expanding gas bubble forces any liquid [7] distal to the expanding gas out of the distal end [3003] of each pulsejet [3100] causing it to impact the material [I]. Rapidly repeating this process causes the system to bore a hole through the material [I].

La présente invention a trait à un système cryogénique permettant le perçage d'un trou de petit diamètre à travers divers matériaux comprenant la roche, le sol et la pierre. Il utilise une technique sans soupape dans une tête de perçage [3000] où un fluide cryogénique [7] remplit au moins un dispositif propulseur [3100] qui présente des extrémités proximale [3001] et distale [3003]. Le fluide cryogénique [7] est congelé dans un bouchon [8] à proximité de l'extrémité distale [3003], servant de soupape. Le fluide cryogénique [7] immédiatement distal par rapport au bouchon [8] est réchauffé rapidement par des unités thermiques [3510, 3530] le transformant en une bulle de gaz à dilatation rapide. La bulle de gaz à dilatation rapide entraîne de force tout liquide [7] distal par rapport au gaz de dilatation hors de l'extrémité distale [3003] de chaque dispositif de propulsion [3100] provoquant son impact sur le matériau [1]. La répétition rapide de ce procédé entraîne le perçage d'un trou à travers le matériau [1] par le système.

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