Patent ID: 6955219
Filing Date: 2005-10-18
Classification: E21B,F24T,Y02E

Abstract:
1. A method for installing a heat exchange pipe loop in a borehole, the method comprising drilling a borehole from an earth surface down into earth using sonic apparatus with a sonic drill head, the sonic drill head having casing connected thereto, drill apparatus connected to a lower end of the casing so that movement of the casing by the sonic drill head drills the borehole down into the earth, the casing having an interior, pumping drilling fluid down into the casing during drilling, down through the casing and out through the drilling apparatus, and upwardly in an annular space between an interior surface of the borehole and an exterior surface of the casing so that drilled material flows upward through the annular space in the borehole preventing drilled material from flowing up into the casing's interior, lowering a heat exchange pipe loop down into the casing, introducing grout into the casing around the heat exchange pipe loop, the grout displacing an amount of the mixture of drilling fluid from within the casing, and extracting the casing from the borehole.