A method of geothermal loop installation

E - Fixed Constructions – 21 – B

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E21B 7/00 (2006.01) F16L 1/028 (2006.01) F24J 3/08 (2006.01)

Patent

CA 2536928

There is provided a method for drilling a hole into the ground and installing a geothermal transfer loop. A drilling apparatus is positioned at a desired location. The drilling apparatus includes a rotating and vibrating apparatus, such as a sonic drill, for rotating and vibrating a hollow drill string into the ground. The hollow drill string having an inner space. A hole is drilled to a desired depth by rotating and vibrating the hollow drill string into the ground while discharging fluid into the inner space of the hollow drill string. The fluid forming a fluid column in the inner space of the drill string. The fluid column impedes entry of ground materials into the inner space of the drill string and is vibrated to create a water hammer for adding an additional drilling force. A geothermal transfer loop is lowered into the inner space of the hollow drill string and the drill string is removed from the ground. The method may also include discharging grouting material into the hole.

L'invention porte sur une méthode pour percer un trou dans la terre et installer une boucle de transfert géothermique. Un appareil de forage est placé à un emplacement désiré. L'appareil de forage comprend un apparail de rotation et de vibration, comme un appareil de forage par vibrations, pour faire tourner et vibrer une rame de forage creux dans la terre. La rame de forage creux comporte un espace interne. Un trou est percé à une profondeur désirée en faisant tourner et vibrer la rame de forage creux dans la terre tout en déchargeant un fluide dans l'espace interne de la rame de forage creux. Le fluide forme une colonne de fluide dans l'espace interne de la rame de forage. La colonne de fluide empêche l'entrée de matériels terrestres dans l'espace interne de la rame de forage et est vibrée pour créer un coup de bélier pour ajouter une force de forage supplémentaire. Une boucle de transfert géothermique est abaissée dans l'espace interne de la rame de forage creux et la rame de forage est retirée de la terre. La méthode peut également comprendre la décharge de matériel de coulis dans le trou.

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